| Transmission woes [message #250124] |
Mon, 19 May 2014 14:58  |
74CanyonLands
Messages: 81
Registered: September 2013
Location: Los Angeles
Karma: 0
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Hey Gang-
So I have been out on the road for a month and my transmission failed....
bummer for sure.
Is the GMC transmission just not up for the job of long periods of travel?
Do I have to check the level every time I look at it?
I thought it would be a little more stout than it is....
Any insight would be appreciated about things to watch out for with these transmissions.
Thanks!
CR
Curt Remington,
74 Canyonlands
Los Angeles, CA
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| Re: Transmission woes [message #250127 is a reply to message #250124] |
Mon, 19 May 2014 15:27  |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Curt, the tranny is up to the chore. Not sure how much you tow behind though. My first trans did great. Had a little leak so every 500 miles, usually second gas fill up, I pulled the stick and made sure it was ok, every 500 religiously. Was towing a Pontiac Vibe gt. Lost an engine. Too much slack in the chain but after some measurements Manny said swap transmission, new chain would not work. Well, this thing leaked worse than the old one, not Manny's fault, so I made sure I kept a close check on fluid. Lost another engine. Had the engine builder pull all the stuff and replace gaskets on the tranny, no leaks anywhere. So, it does not leak, I don't check nearly as often. But, if one sees trans fluid anywhere then better be checking the fluid on a regular basis. I had 35 k on the old tranny, but it was last built in 93 so no telling how many miles were on it.
This may not have been your problem but I am a true believer in the 425 being a good tranny for our coaches, with moderate weight toads.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: Transmission woes [message #250128 is a reply to message #250124] |
Mon, 19 May 2014 15:40 |
Jon payne
Messages: 495
Registered: May 2008
Karma: 1
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The 425TH in our application, is good for 100K. The PO, (my father-in-law) had it rebuilt at 106k back in 93. It now has 114K. How many miles does yours have on it when it failed?
Jon Payne
76 Palm Beach
Westfield,IN
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| Re: [GMCnet] Transmission woes [message #250136 is a reply to message #250124] |
Mon, 19 May 2014 16:31 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Curt,
The TH-425 has an exceptional reputation for sturdiness and reliability.
It's capable of running in the GMC for 100,000+ miles with no more
attention than checking fluid level occasionally and changing it every
25,000 miles or so. If you're towing a heavy load, you should install a
temperature gauge and keep the transmission temperature below 200*F if
possible. Downshifting when going uphill with a heavy load is essential.
I have a policy of never being in 3rd gear below 45 mph and shift down
from 2nd to 1st below 25 mph (VERY rare).
Since the TH-425 is so long out of production, repair parts are scarce,
some of them impossible to obtain -- unless you buy a Manny Tranny. Manny
has virtually cornered the market on many parts and has new parts made to
his specifications when necessary. He is THE source for GMC MH TH-425's.
Call Manny.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com
On Mon, May 19, 2014 at 3:58 PM, Curt Remington wrote:
> Hey Gang-
>
> So I have been out on the road for a month and my transmission failed....
> bummer for sure.
>
> Is the GMC transmission just not up for the job of long periods of travel?
>
> Do I have to check the level every time I look at it?
>
>
> I thought it would be a little more stout than it is....
> Any insight would be appreciated about things to watch out for with these
> transmissions.
>
> Thanks!
> CR
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Transmission woes [message #250142 is a reply to message #250136] |
Mon, 19 May 2014 17:46 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ditto,
Manny's number: Four 0 eight - 9 three 7- one5 eight 3
Regards,
Rob M.
-----Original Message-----
From: Ken Henderson
Curt,
The TH-425 has an exceptional reputation for sturdiness and reliability.
It's capable of running in the GMC for 100,000+ miles with no more
attention than checking fluid level occasionally and changing it every
25,000 miles or so. If you're towing a heavy load, you should install a
temperature gauge and keep the transmission temperature below 200*F if
possible. Downshifting when going uphill with a heavy load is essential.
I have a policy of never being in 3rd gear below 45 mph and shift down
from 2nd to 1st below 25 mph (VERY rare).
Since the TH-425 is so long out of production, repair parts are scarce,
some of them impossible to obtain -- unless you buy a Manny Tranny. Manny
has virtually cornered the market on many parts and has new parts made to
his specifications when necessary. He is THE source for GMC MH TH-425's.
Call Manny.
Ken H.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Transmission woes [message #250189 is a reply to message #250124] |
Tue, 20 May 2014 11:19 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Senior Member |
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How do you know the tranny has failed? Sometimes they get "Morning Sickness" Usually cause low on fluid.Rev that baby up after making sure its full and it should engage in either reverse or drive.
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: Transmission woes [message #250268 is a reply to message #250189] |
Wed, 21 May 2014 14:32 |
74CanyonLands
Messages: 81
Registered: September 2013
Location: Los Angeles
Karma: 0
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Member |
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Thanks for all the comments. I am sure it will get sorted out but I definitely don't want to go through that again.
I think a leak sprung up somewhere we'll just have to find out where and fix it.
Curt Remington,
74 Canyonlands
Los Angeles, CA
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