| [GMCnet] Transmission pan leaks [message #358516] |
Sat, 12 September 2020 13:52  |
fbhtxak
Messages: 191
Registered: April 2006
Karma: 0
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Senior Member |
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Re chain cover, excellent point, Jim.
'Had that problem after having the TH425 rebuilt at about 100K mi. 'Took a
while to conclusively identify it as the source of the leak (about 1 pint
into a large oil drip pan between trips of 3-6 months.) Did not leak during
trips... 'Had C'bar replace the chain cover gasket about 40K mi. later when
I had them replace the OEM "403" with a Paterson "403". That was four years
ago; no drips from TH425 or "403" in the meantime.
Fred Hudspeth
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
Message: 10
Date: Sat, 12 Sep 2020 08:23:06 -0700
From: Jim Kanomata
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Transmission pan leaks
Message-ID:
Content-Type: text/plain; charset="UTF-8"
If yoo did the gasket and sealant correctly and wait for15 minutes then put
in fluid,it should not leak fron the pan.
Look to see if it can be from the rear chain cover.
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| Re: [GMCnet] Transmission pan leaks [message #358706 is a reply to message #358695] |
Wed, 16 September 2020 20:06  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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And it has a drain plug!
Larry Davick
‘76 Palm Beach
> On Sep 16, 2020, at 12:48 PM, James Hupy via Gmclist wrote:
>
> Same shape. Different materials.
> Jim Hupy
> Salem, Oregon
>
>> On Wed, Sep 16, 2020, 11:35 AM willie heater via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>
>>
>> Sent from Mail for
>> Windows 10
>> Does the Ragusa pan use a different gasket than the original pan?
>>
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Transmission pan leaks [message #358709 is a reply to message #358516] |
Wed, 16 September 2020 20:45 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Manny had me use black RTV and no gasket with the Ragusa pan. 10 years later when I had to open it up again I used RTV again a second time. Still no leaks.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Transmission pan leaks [message #358732 is a reply to message #358709] |
Thu, 17 September 2020 10:47 |
mannystrans
Messages: 209
Registered: June 2006
Karma: 1
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Senior Member |
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Most of the dismantlers just poke a hole in the pan to drain the fluid.
I also get alot of pans so bent up or damaged that I would have to spend
alot of time straightening.
Good thing Ragusa made these pans and they look good specially with the
final drive cover.
Sealing the aluminum pans has been challenging. Chuck Stoddard liked the
aluminum pans and had some success sealing them with a grey RTV made in
Cincinnati but it was hard to find. I started coating the side of the
gasket against the case with Aviation gasket sealer and putting o-rings on
the bolts with some success. The bolts are only tightened to 11ftlbs so
over tightening will create leaks.
--
Manny Trovao
mannystrans@gmail.com
Manny's Transmission
San Jose, California
408-937-1583
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