Home » Public Forums » GMCnet » 403 transmission (changing fluids ?)
| 403 transmission [message #289982] |
Thu, 05 November 2015 09:43  |
Glover, Brian K.
Messages: 87
Registered: October 2015
Location: Griffin Georgia
Karma: 0
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I am wanting to change the transmission fluid and filtes ? etc.. on my 1978 GMC Motorhome with the 403.
Not sure what all I need Fluid, Filters ,, etc.. can anyone steer me in the right direction ?
Thanks,
Brian G
Brian G.
Griffin Ga.
1978 Eleganza II
TZE168V101637
[Updated on: Thu, 05 November 2015 09:43] Report message to a moderator |
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| Re: 403 transmission [message #289985 is a reply to message #289982] |
Thu, 05 November 2015 10:33  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Call Manny Travao (Manny's Trannys) and follow his advice. He's the Guru for 425s in our motorhomes.
--johnny
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: 403 transmission [message #289987 is a reply to message #289982] |
Thu, 05 November 2015 10:59 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Brian,
Oil, filter, pan gasket (not cork), a car lift would certainly help.
Check the new filter against the the old one, as to shape of the pickup tube and especially the diameter of the tube going into the valve body.
They're not all the same. Bad things can happen with cheap imitations.
If your old gasket is still good then reuse it. Don't over torque the bolts.
If the pan doesn't have a drain plug and/or temp sender bung, this would be the time to put them in. Draining will be so much easier next time.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: [GMCnet] 403 transmission [message #289989 is a reply to message #289987] |
Thu, 05 November 2015 11:08 |
Glover, Brian K.
Messages: 87
Registered: October 2015
Location: Griffin Georgia
Karma: 0
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Thanks, for the information, I will pay attention to the items you pointed out !!
Brian
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Adrien Genesoto
Sent: Thursday, November 05, 2015 11:59 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] 403 transmission
Brian,
Oil, filter, pan gasket (not cork), a car lift would certainly help.
Check the new filter against the the old one, as to shape of the pickup tube and especially the diameter of the tube going into the valve body.
They're not all the same. Bad things can happen with cheap imitations.
If your old gasket is still good then reuse it. Don't over torque the bolts.
If the pan doesn't have a drain plug and/or temp sender bung, this would be the time to put them in. Draining will be so much easier next time.
--
”When we avoid the mistakes we might have made, we sometimes make the mistakes that we might have avoided.”
Adrien & Jenny 6993339035
75 Glenbrook
Yuba City,Ca.
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Brian G.
Griffin Ga.
1978 Eleganza II
TZE168V101637
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| Re: [GMCnet] 403 transmission [message #290018 is a reply to message #289992] |
Fri, 06 November 2015 00:52 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Call us and we will give you the diamater .
We always check them as the wrong ones are being supplied by all suppliers.
Gary will be able to get you the info.
On Thu, Nov 5, 2015 at 10:51 AM, Matt Colie wrote:
> At Western States last fall, Manny torn down and reassembled a 425 in
> front of us...
> JimK (as I recall) went out and got him a pan gasket and filter. The size
> of the filter pipe were it goes into the valve body was small. That is the
> case with many of the filters being shipped in from China. (I mean Many.)
> So, if you get a filter, be ready to see if it fits and return it if it
> doesn't.
>
> Matt
> --
> Matt & Mary Colie - Members GMCMI, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] 403 transmission [message #290022 is a reply to message #290021] |
Fri, 06 November 2015 07:03 |
Glover, Brian K.
Messages: 87
Registered: October 2015
Location: Griffin Georgia
Karma: 0
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Ok,,, thanks that really helps ! I had no clue that is what it would look like ? I guess I need to read up on it a little more before I jump into it ! thanks a lot .
Brian
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Robert Mueller
Sent: Friday, November 06, 2015 7:58 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] 403 transmission
Brian,
Here you go:
http://www.gmcmhphotos.com/photos/g6759-transmission-filter.html
--
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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Brian G.
Griffin Ga.
1978 Eleganza II
TZE168V101637
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| Re: [GMCnet] 403 transmission [message #290025 is a reply to message #290021] |
Fri, 06 November 2015 08:00 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Also be sure that there are no wayward O rings left behind stuck up in the valve body. Otherwise they can be forced up into the valves and create big issues.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] 403 transmission [message #290026 is a reply to message #290025] |
Fri, 06 November 2015 08:10 |
Glover, Brian K.
Messages: 87
Registered: October 2015
Location: Griffin Georgia
Karma: 0
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Thanks, I will make sure I pay attention when I do it,, right now trying to get all the info I can before I start ! and really good to know guys like you are there ,,,, for when I screw up !!! and need a little help !
Thanks,
Brian
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of John R. Lebetski
Sent: Friday, November 06, 2015 9:01 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] 403 transmission
Also be sure that there are no wayward O rings left behind stuck up in the valve body. Otherwise they can be forced up into the valves and create big
issues.
--
John Lebetski
Woodstock, IL
77 Eleganza II
Source America First
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Brian G.
Griffin Ga.
1978 Eleganza II
TZE168V101637
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| Re: [GMCnet] 403 transmission [message #290068 is a reply to message #290044] |
Sat, 07 November 2015 04:18 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Brian,
Here is a manual that GM printed out in 1969 of which bdub posted. It has
some good info on trouble shooting the TH425.
http://www.bdub.net/manuals/THM_425_Trouble_Shooting.pdf
On Fri, Nov 6, 2015 at 12:52 PM, Hal Kading wrote:
> Brian,
>
> In addition to the shape of the pick-up tube, check the angle that it
> comes out of the body of the filter. Some of the filter pick-up tubes don't
> go
> far enough down into the pan.
>
> Hal Kading 78 Buskirk Las Cruces NM
>
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] 403 transmission [message #290086 is a reply to message #290068] |
Sat, 07 November 2015 11:28 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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This is what you want in a Trans filter. The original filter that works well with the 425 is the AC Delco TF-169, it can be found but rarely. Check on Amazon and Ebay too for this and all the filters!
http://www.gmcmhphotos.com/photos/general-pictures/p36768-ac-transmission-filter.html
What ever you do buy it should be like this one on inlet and outlet layout
http://www.gmcmhphotos.com/photos/general-pictures/p36766-ac-transmission-filter.html
http://www.gmcmhphotos.com/photos/general-pictures/p36767-ac-transmission-filter.html
http://www.gmcmhphotos.com/photos/general-pictures/p36764-ac-transmission-filter.html
I make no recommendations on any of these filters, all are listed to fit the 425 transmission off a cross ref list for the 425 transmission. Need to check the inlet side to make sure that it fits snuggly with the o-ring into the transmission. If it is sloppy it will not work.
Atlas 131
ATP-B40
Baldwin 6019
Carquest 85882
Fram FT-1019A
Hastings TF-17
NAPA 1882
Niehoff TF207
Purolator P-219
Wix 51882
Some of these may not be available where you live. Some have found difference in quality and fit within the same part number, check what you get and compare with the one that you are changing out.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 7, 2015, at 5:18 AM, Bruce Hart wrote:
>
> Brian,
>
> Here is a manual that GM printed out in 1969 of which bdub posted. It has
> some good info on trouble shooting the TH425.
>
> http://www.bdub.net/manuals/THM_425_Trouble_Shooting.pdf
>
> On Fri, Nov 6, 2015 at 12:52 PM, Hal Kading wrote:
>
>> Brian,
>>
>> In addition to the shape of the pick-up tube, check the angle that it
>> comes out of the body of the filter. Some of the filter pick-up tubes don't
>> go
>> far enough down into the pan.
>>
>> Hal Kading 78 Buskirk Las Cruces NM
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] 403 transmission [message #290197 is a reply to message #290094] |
Tue, 10 November 2015 19:12 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Rob,
I have upload more pictures of the AC Delco TF-169 transmission filter, including another picture of the label. Use the left arrow on the picture to go thru the others.
http://www.gmcmhphotos.com/photos/general-pictures/p59526-tf-169.html
JR
> On Nov 7, 2015, at 5:59 PM, Robert Mueller wrote:
>
> JR,
>
> You are VERY fortunate to have found those TF-169 filters as they are rare as rocking horse poo! I have an eBay Followed Search for
> them and have never found one.
>
> BTW when you have some time could you take a better picture of the AC box it's kinda fuzzy and I note there's some extra numbers on
> it that might prove helpful when searching for them.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
>
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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