Home » Public Forums » GMCnet » [GMCnet] Need Transmission -any suggestions
| [GMCnet] Need Transmission -any suggestions [message #195170] |
Tue, 08 January 2013 10:24  |
Tim Jeffries
Messages: 35
Registered: August 2012
Karma: 0
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Member |
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Hi - Even though I'm out of state for the week in Madison,Wisconsin, I
dropped my 1973 GMC Painted Desert off at the transmission shop before I
left. In order to get a good check-up, some maintenance and an opinion
about the condition I left it for the entire week I'm gone.
.....Well, I just got a text saying that *first gear is gone*, there is
nothing he can do with it and I need a "new" transmission. Currently its
the 400.
It seems drivable and I have put about 250 miles on it. Just replaced the
fuel lines and several other things that were keeping me from giving the
tranny a good test.
I am a Park Host at a County Park here in San Diego and don't absolutely
have to do anything right away because I live in it and don't have to drive
it down the mountain much. I won't be traveling anywhere till summer when I
have a 1700 mile trip planned in some mountainous northern Cal territory.
Do I have do change this thing out or complete re-build? Are there other
options? Am I risking being left by the side of the road?
The price I am being quoted for a complete re-build is $2,800 to $3,200.
The GMC had not been driven for 8 years and I suspect the fluid had not ben
changed for an additional 8 years. I suspect there is a lot of sediment in
the thing -keeping it from shifting right -but I haven't yet spoken to the
technician.
My shadetree mechanic, Rolando says he is looking for options such as
something of an upgrade to possibly a 4 speed or something stronger.
Should I leave it at the tranny shop till I get back to move it home to the
campsite and just live in it? OR should I give him the green light to go
ahead and re-build it? The shop is 80 miles from home.
I live in the GMC so I'm not missing it so much while out of town, which is
why I'm considering giving him the green light to start the work.
What other trannys are compatible?
Is there any good news out there or advice?
Thanks for your advice,
Tim J
1973 26' Painted Desert
North San Diego County
760-877-2778
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| Re: [GMCnet] Need Transmission -any suggestions [message #195172 is a reply to message #195170] |
Tue, 08 January 2013 10:42  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Tim Jeffries wrote on Tue, 08 January 2013 11:24 |
Hi - Even though I'm out of state for the week in Madison,Wisconsin, I dropped my 1973 GMC Painted Desert off at the transmission shop before I left. In order to get a good check-up, some maintenance and an opinion about the condition I left it for the entire week I'm gone.
.....Well, I just got a text saying that *first gear is gone*, there is nothing he can do with it and I need a "new" transmission. Currently its the 400.
It seems drivable and I have put about 250 miles on it. Just replaced the fuel lines and several other things that were keeping me from giving the tranny a good test.
I am a Park Host at a County Park here in San Diego and don't absolutely have to do anything right away because I live in it and don't have to drive it down the mountain much. I won't be traveling anywhere till summer when I have a 1700 mile trip planned in some mountainous northern Cal territory.
Do I have do change this thing out or complete re-build? Are there other options? Am I risking being left by the side of the road?
The price I am being quoted for a complete re-build is $2,800 to $3,200.
The GMC had not been driven for 8 years and I suspect the fluid had not been changed for an additional 8 years. I suspect there is a lot of sediment in the thing -keeping it from shifting right -but I haven't yet spoken to the technician.
My shadetree mechanic, Rolando says he is looking for options such as something of an upgrade to possibly a 4 speed or something stronger.
Should I leave it at the tranny shop till I get back to move it home to the campsite and just live in it? OR should I give him the green light to go ahead and re-build it? The shop is 80 miles from home.
I live in the GMC so I'm not missing it so much while out of town, which is why I'm considering giving him the green light to start the work.
What other trannys are compatible?
Is there any good news out there or advice?
Thanks for your advice,
Tim J
1973 26' Painted Desert
North San Diego County
760-eight77-two778
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Tim,
The transmission is a 425 and was only used in Toronado, Eldorado and TZE...
Only one thing to do..
Call Manny Trovao (four08 93seven one583)
And get him to ship you a re-build.
He only does tramsmissions for GMC. He makes them so they are better than new. And, he is very cost effective.
Get it, have Ronaldo put it in and enjoy the summer.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Need Transmission -any suggestions [message #195173 is a reply to message #195170] |
Tue, 08 January 2013 10:42 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Tim, best solution for you is to contact either Migel Mendes in LA or Jim
K. in the bay area and have them facilitate shipping to your mechanic a
transmission that is rebuilt for Motorhome use by Manny T. jwiwd in your
situation.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Jan 8, 2013 8:24 AM, "Tim Jeffries" <landhoundgmcer@gmail.com> wrote:
> Hi - Even though I'm out of state for the week in Madison,Wisconsin, I
> dropped my 1973 GMC Painted Desert off at the transmission shop before I
> left. In order to get a good check-up, some maintenance and an opinion
> about the condition I left it for the entire week I'm gone.
> .....Well, I just got a text saying that *first gear is gone*, there is
> nothing he can do with it and I need a "new" transmission. Currently its
> the 400.
>
> It seems drivable and I have put about 250 miles on it. Just replaced the
> fuel lines and several other things that were keeping me from giving the
> tranny a good test.
> I am a Park Host at a County Park here in San Diego and don't absolutely
> have to do anything right away because I live in it and don't have to drive
> it down the mountain much. I won't be traveling anywhere till summer when I
> have a 1700 mile trip planned in some mountainous northern Cal territory.
> Do I have do change this thing out or complete re-build? Are there other
> options? Am I risking being left by the side of the road?
> The price I am being quoted for a complete re-build is $2,800 to $3,200.
> The GMC had not been driven for 8 years and I suspect the fluid had not ben
> changed for an additional 8 years. I suspect there is a lot of sediment in
> the thing -keeping it from shifting right -but I haven't yet spoken to the
> technician.
>
> My shadetree mechanic, Rolando says he is looking for options such as
> something of an upgrade to possibly a 4 speed or something stronger.
> Should I leave it at the tranny shop till I get back to move it home to the
> campsite and just live in it? OR should I give him the green light to go
> ahead and re-build it? The shop is 80 miles from home.
> I live in the GMC so I'm not missing it so much while out of town, which is
> why I'm considering giving him the green light to start the work.
> What other trannys are compatible?
> Is there any good news out there or advice?
> Thanks for your advice,
> Tim J
> 1973 26' Painted Desert
> North San Diego County
> 760-877-2778
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Need Transmission -any suggestions [message #195175 is a reply to message #195170] |
Tue, 08 January 2013 10:48 |
Sandra Price
Messages: 709
Registered: May 2006
Karma: 1
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Senior Member |
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Before I'd spend much money, I'd service the transmission and run the gear
shift back and forth while driving to see if it has a hung valve. There is
no replacement for that transmission, so the only option is rebuilding
yours. Check with Jim Kanomata. He may be able to help. All the best!
Bob Price
On Jan 8, 2013 10:24 AM, "Tim Jeffries" <landhoundgmcer@gmail.com> wrote:
> Hi - Even though I'm out of state for the week in Madison,Wisconsin, I
> dropped my 1973 GMC Painted Desert off at the transmission shop before I
> left. In order to get a good check-up, some maintenance and an opinion
> about the condition I left it for the entire week I'm gone.
> .....Well, I just got a text saying that *first gear is gone*, there is
> nothing he can do with it and I need a "new" transmission. Currently its
> the 400.
>
> It seems drivable and I have put about 250 miles on it. Just replaced the
> fuel lines and several other things that were keeping me from giving the
> tranny a good test.
> I am a Park Host at a County Park here in San Diego and don't absolutely
> have to do anything right away because I live in it and don't have to drive
> it down the mountain much. I won't be traveling anywhere till summer when I
> have a 1700 mile trip planned in some mountainous northern Cal territory.
> Do I have do change this thing out or complete re-build? Are there other
> options? Am I risking being left by the side of the road?
> The price I am being quoted for a complete re-build is $2,800 to $3,200.
> The GMC had not been driven for 8 years and I suspect the fluid had not ben
> changed for an additional 8 years. I suspect there is a lot of sediment in
> the thing -keeping it from shifting right -but I haven't yet spoken to the
> technician.
>
> My shadetree mechanic, Rolando says he is looking for options such as
> something of an upgrade to possibly a 4 speed or something stronger.
> Should I leave it at the tranny shop till I get back to move it home to the
> campsite and just live in it? OR should I give him the green light to go
> ahead and re-build it? The shop is 80 miles from home.
> I live in the GMC so I'm not missing it so much while out of town, which is
> why I'm considering giving him the green light to start the work.
> What other trannys are compatible?
> Is there any good news out there or advice?
> Thanks for your advice,
> Tim J
> 1973 26' Painted Desert
> North San Diego County
> 760-877-2778
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Need Transmission -any suggestions [message #195178 is a reply to message #195175] |
Tue, 08 January 2013 11:14 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Seems to be a candidate for a phone call and
then a trip (if feasible) to Manny's Trannies
to get it done right!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Tue, 8 Jan 2013 10:48:55 -0600
> From: bsprice9359@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Need Transmission -any suggestions
>
> Before I'd spend much money, I'd service the transmission and run the gear
> shift back and forth while driving to see if it has a hung valve. There is
> no replacement for that transmission, so the only option is rebuilding
> yours. Check with Jim Kanomata. He may be able to help. All the best!
> Bob Price
> On Jan 8, 2013 10:24 AM, "Tim Jeffries" <landhoundgmcer@gmail.com> wrote:
>
> > Hi - Even though I'm out of state for the week in Madison,Wisconsin, I
> > dropped my 1973 GMC Painted Desert off at the transmission shop before I
> > left. In order to get a good check-up, some maintenance and an opinion
> > about the condition I left it for the entire week I'm gone.
> > .....Well, I just got a text saying that *first gear is gone*, there is
> > nothing he can do with it and I need a "new" transmission. Currently its
> > the 400.
> >
> > It seems drivable and I have put about 250 miles on it. Just replaced the
> > fuel lines and several other things that were keeping me from giving the
> > tranny a good test.
> > I am a Park Host at a County Park here in San Diego and don't absolutely
> > have to do anything right away because I live in it and don't have to drive
> > it down the mountain much. I won't be traveling anywhere till summer when I
> > have a 1700 mile trip planned in some mountainous northern Cal territory.
> > Do I have do change this thing out or complete re-build? Are there other
> > options? Am I risking being left by the side of the road?
> > The price I am being quoted for a complete re-build is $2,800 to $3,200.
> > The GMC had not been driven for 8 years and I suspect the fluid had not ben
> > changed for an additional 8 years. I suspect there is a lot of sediment in
> > the thing -keeping it from shifting right -but I haven't yet spoken to the
> > technician.
> >
> > My shadetree mechanic, Rolando says he is looking for options such as
> > something of an upgrade to possibly a 4 speed or something stronger.
> > Should I leave it at the tranny shop till I get back to move it home to the
> > campsite and just live in it? OR should I give him the green light to go
> > ahead and re-build it? The shop is 80 miles from home.
> > I live in the GMC so I'm not missing it so much while out of town, which is
> > why I'm considering giving him the green light to start the work.
> > What other trannys are compatible?
> > Is there any good news out there or advice?
> > Thanks for your advice,
> > Tim J
> > 1973 26' Painted Desert
> > North San Diego County
> > 760-877-2778
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| Re: [GMCnet] Need Transmission -any suggestions [message #195179 is a reply to message #195170] |
Tue, 08 January 2013 11:17 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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sounds like more looking into it is needed. and more description of problems. I am sure Manny or either of the Jims could guide you to the correct decision.
few reasons. Matt is correct, it is not being described as the right tranny. It is a 425. also, there is no substitutions at all. If what is there goes bad. you fix that one.
When someone just says "1st gear is gone" really?? how are they sure?? how was that tested. Usually I found reverse goes first, then it just doesn't shift. but a tranny could of just went toast that way. but be sure before spending huge money.
The governor could be the culprit. I messed mine up this year when i changed the plastic gear on it. Bent something inside, and there my gmc was stuck in third. I could force it to downshift to 2nd. but no 1st. could be a few other problems before i would for sure say "1st gear is gone".
call the experts if you are not an expert. correct advice is only a phone call away.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Need Transmission -any suggestions [message #195183 is a reply to message #195181] |
Tue, 08 January 2013 11:47 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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[quote title=Cadillackeeper wrote on Tue, 08 January 2013 09:33]That trans should not cost over $1200...EVER!!!!
It is a simple easy fix.
Don't forget the cost of labor to R&R. Not difficult but time consuming
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Need Transmission -any suggestions [message #195184 is a reply to message #195170] |
Tue, 08 January 2013 12:05 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Senior Member |
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That should be the price for taking it out,scattering it across the bench,all new steels and gaskets and wacking it back in.
Very simple compared to anything late model.The 400/425/325
has been around for almost 50 years!
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: [GMCnet] Need Transmission -any suggestions [message #195190 is a reply to message #195170] |
Tue, 08 January 2013 12:49 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Tim,
You're not accepting private messages. Either turn it on or post your email address. I'll send you some info offline regarding transport; if you're getting a tranny from Manny or Jim K.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Need Transmission -any suggestions [message #195191 is a reply to message #195170] |
Tue, 08 January 2013 12:50 |
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hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma: 0
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Senior Member |
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Tim;
Susie and I are going up to Mannys the week of Jan. 21, back around the 26?
Manny is installing a one ton front end on our 74 GMC.
I would more the happy to bring one of Mannys transmissions back to San
Diego.
Mannys phone number is 408 937 1583
Our home phone number is 619 45 9777 my cell number is 619 977 9744
Please call my home number first, the cell is not clear at our home.
We live out in the sticks!
What county park are you at here in San Diego?
All is well with my Lord
Howard
The best argument against democracy is a five minute conversation with the
average voter
(Winston Churchill)
----- Original Message -----
From: "Tim Jeffries" <landhoundgmcer@gmail.com>
To: <gmclist@temp.gmcnet.org>
Sent: Tuesday, January 08, 2013 08:24
Subject: [GMCnet] Need Transmission -any suggestions
> Hi - Even though I'm out of state for the week in Madison,Wisconsin, I
> dropped my 1973 GMC Painted Desert off at the transmission shop before I
> left. In order to get a good check-up, some maintenance and an opinion
> about the condition I left it for the entire week I'm gone.
> .....Well, I just got a text saying that *first gear is gone*, there is
> nothing he can do with it and I need a "new" transmission. Currently its
> the 400.
>
> It seems drivable and I have put about 250 miles on it. Just replaced the
> fuel lines and several other things that were keeping me from giving the
> tranny a good test.
> I am a Park Host at a County Park here in San Diego and don't absolutely
> have to do anything right away because I live in it and don't have to
> drive
> it down the mountain much. I won't be traveling anywhere till summer when
> I
> have a 1700 mile trip planned in some mountainous northern Cal territory.
> Do I have do change this thing out or complete re-build? Are there other
> options? Am I risking being left by the side of the road?
> The price I am being quoted for a complete re-build is $2,800 to $3,200.
> The GMC had not been driven for 8 years and I suspect the fluid had not
> ben
> changed for an additional 8 years. I suspect there is a lot of sediment in
> the thing -keeping it from shifting right -but I haven't yet spoken to the
> technician.
>
> My shadetree mechanic, Rolando says he is looking for options such as
> something of an upgrade to possibly a 4 speed or something stronger.
> Should I leave it at the tranny shop till I get back to move it home to
> the
> campsite and just live in it? OR should I give him the green light to go
> ahead and re-build it? The shop is 80 miles from home.
> I live in the GMC so I'm not missing it so much while out of town, which
> is
> why I'm considering giving him the green light to start the work.
> What other trannys are compatible?
> Is there any good news out there or advice?
> Thanks for your advice,
> Tim J
> 1973 26' Painted Desert
> North San Diego County
> 760-877-2778
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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All is well with my Lord
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| Re: [GMCnet] Need Transmission -any suggestions [message #195199 is a reply to message #195194] |
Tue, 08 January 2013 13:34 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: I have a local Tranny guy that does know the GMC and is trustworthy. He charges $500 to remove and replace the tranny and includes fluid. I thought a little high but talking to other GMCers it seemed fair as they said they would not do it for that. The tranny is easer to remove by leaving the differential and axles in the coach. I also would recommend Manny for a Tranny. Some parts are obsolite as the front pump. Mine had a crack around the seal and was leaking.
[quote title=Tim Jeffries wrote on Tue, 08 January 2013 14:00]Gene, Plz clarify, is that $1200 for R&R and rebuild? I don't have a place
to R&R.
Or are your talking about buying used (ergo: the Cadillac link).
Tim J
On Tue, Jan 8, 2013 at 11:47 AM, gene barrow <barrowgene@gmail.com> wrote:
>
>
> | Cadillackeeper wrote on Tue, 08 January 2013 09:33 |
That trans
> should not cost over $1200...EVER!!!!
> It is a simple easy fix.
>
> Don't forget the cost of labor to R&R. Not difficult but time consuming
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Need Transmission -any suggestions [message #195200 is a reply to message #195170] |
Tue, 08 January 2013 13:45 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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There are only two good choices for a 425 transmission built for a GMC. Do not get one rebuilt a Toronado because as you want the heavier components.
I had never pulled or replaced one before and it took us 1.5 hours to pull mine working on a concrete floor and 2.5 hours to install the Manny rebuilt one. I watched Manny change one in about 3 hours in a parking lot by himself. If a trans shop is charging you more than 4 hours labor you being screwed.
Here are the places:
http://www.mannystransmission.biz/
http://www.paterson-gmc.com/
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Need Transmission -any suggestions [message #195202 is a reply to message #195170] |
Tue, 08 January 2013 13:50 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Tim
That transmission is a turbohydramatic (THM) 425. It's a brother of the the GM THM400, designed specifically for heavy front wheel drive cars. The THM 4XX series of transmissions are considered to be among the best of heavy duty non electronic automatic transmissions. (especially during the day). It is still the best option for your GMC Motorhome, unless you want to re-engineer everything in the GMC drive line and suspension and have a boatload of time, money, skills, and patience.
The first gear can go out as it did in mine when a governor pressure pipe fell out of the valve body. It burned out one of the clutches and very quickly would not move forward.
I would not presume to tell you what is wrong with your transmission because I am not there and have not done any diagnostics, however it does seem strange that if you just brought your transmission in for a routine service and checkout, that they should diagnose such a disastrous condition.
Assuming however, that if you need a replacement transmission, DO NOT get a local built or any transmission rebuilt from anyone other than Our GMC Motorhome suppliers. I have seen Manny build his transmissions, and his are the same as heavy heavy duty, Level 3 drag race transmissions capable of many many horse power. However they are tuned for your GMC. His price was extremely good based on the product you get. He puts in some of the following high performance parts that are not even in the stock transmissions
- High Performance frictions (clutches and bands)
- Torrington needle bearings rather than thrust shims in key spots
- increases the number of clutch plates and frictions in key clutch packs. (this requires re machining the clutch piston)
- replaces every sleeve bearing, and seal in the unit.
Replaces ever shift spring and check ball in the valve body to custom ones required for your unit
- replaces any part that shows signs of wear
- replaces the main chain and gears if they need it
-replaces torque convertor with a custom one that has a Torrington thrust bearing rather than shims
- he works on them meticulously and backs them up
I was super impressed with his work and would only specify his transmission based on what I saw!! I drove my transmission (delivered) all the way from Edmonton, Alberta just to have him work on it!! We have a few rebuild houses here but they would not do the kind of work he does. He also stocks many parts that others refuse to or cannot easily get.
Since you are in California, yo can get Manny's Transmissions Directly from him or at Applied GMC. They will ship the tranny to your service person. An even better option (if you have the time) would be to have your original sent to be rebuilt and shipped back.
Any other rebuilt transmission from other general suppliers will simply be replaced frictions and seals with obvious broken parts replaced only. Being exchange units none will be tuned for your GMC and will shift in different spots and be missing even some of the stock GMC heavy duty parts.
NOTE. I have not been paid for this endorsement!! I truly believe it!!!
Best regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: [GMCnet] Need Transmission -any suggestions [message #195203 is a reply to message #195184] |
Tue, 08 January 2013 13:50 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Let's figure a way to get an A-727 TorqueFlite in the coach. You really got to work to bust one.
--johnny
'76 23' transmode norris
'76 palm beach
From: anthony ezzo <ezzo@earthlink.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, January 8, 2013 1:05 PM
Subject: Re: [GMCnet] Need Transmission -any suggestions
That should be the price for taking it out,scattering it across the bench,all new steels and gaskets and wacking it back in.
Very simple compared to anything late model.The 400/425/325
has been around for almost 50 years!
--
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Need Transmission -any suggestions [message #195206 is a reply to message #195202] |
Tue, 08 January 2013 14:06 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Manny has been accused of repairing to Orlando and rebuilding units for the Co-op to stock. Bounds pointed out a couple when I toured his place last month. I was given to believe, when those were used in coaches, he might well return and build some more for shelf stock.
--johnny
'76 23' transmode norris
'76 palm beach
From: John Heslinga <rbeeper@hotmail.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, January 8, 2013 2:50 PM
Subject: Re: [GMCnet] Need Transmission -any suggestions
Tim
That transmission is a turbohydramatic (THM) 425. It's a brother of the the GM THM400, designed specifically for heavy front wheel drive cars. The THM 4XX series of transmissions are considered to be among the best of heavy duty non electronic automatic transmissions. (especially during the day). It is still the best option for your GMC Motorhome, unless you want to re-engineer everything in the GMC drive line and suspension and have a boatload of time, money, skills, and patience.
The first gear can go out as it did in mine when a governor pressure pipe fell out of the valve body. It burned out one of the clutches and very quickly would not move forward.
I would not presume to tell you what is wrong with your transmission because I am not there and have not done any diagnostics, however it does seem strange that if you just brought your transmission in for a routine service and checkout, that they should diagnose such a disastrous condition.
Assuming however, that if you need a replacement transmission, DO NOT get a local built or any transmission rebuilt from anyone other than Our GMC Motorhome suppliers. I have seen Manny build his transmissions, and his are the same as heavy heavy duty, Level 3 drag race transmissions capable of many many horse power. However they are tuned for your GMC. His price was extremely good based on the product you get. He puts in some of the following high performance parts that are not even in the stock transmissions
- High Performance frictions (clutches and bands)
- Torrington needle bearings rather than thrust shims in key spots
- increases the number of clutch plates and frictions in key clutch packs. (this requires re machining the clutch piston)
- replaces every sleeve bearing, and seal in the unit.
Replaces ever shift spring and check ball in the valve body to custom ones required for your unit
- replaces any part that shows signs of wear
- replaces the main chain and gears if they need it
-replaces torque convertor with a custom one that has a Torrington thrust bearing rather than shims
- he works on them meticulously and backs them up
I was super impressed with his work and would only specify his transmission based on what I saw!! I drove my transmission (delivered) all the way from Edmonton, Alberta just to have him work on it!! We have a few rebuild houses here but they would not do the kind of work he does. He also stocks many parts that others refuse to or cannot easily get.
Since you are in California, yo can get Manny's Transmissions Directly from him or at Applied GMC. They will ship the tranny to your service person. An even better option (if you have the time) would be to have your original sent to be rebuilt and shipped back.
Any other rebuilt transmission from other general suppliers will simply be replaced frictions and seals with obvious broken parts replaced only. Being exchange units none will be tuned for your GMC and will shift in different spots and be missing even some of the stock GMC heavy duty parts.
NOTE. I have not been paid for this endorsement!! I truly believe it!!!
Best regards
--
John and Cathie Heslinga
1974 Canyonlands 260
TC4W "Too Cool For Words"
Retirement Projects Galore
Edmonton, Alberta
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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