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03-21-2013, 07:02 PM
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#1 |
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Registered User
Join Date: Mar 2013
Location: Rochelle, Il
Posts: 63
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TH400 Leak
This winter as i was trying to get my truck unstuck from the snow for several minutes i noticed quite a few drops of trans fluid in the snow after the truck finally became unstuck. I haven't noticed much if any trans fluid on my driveway before when it just sits, however, the fluid does need to be topped off every once in awhile. It just seems odd that it only seems to leak trans fluid while under load. Any one with some advice? Thanks
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'82 C30 3+3 Dually 454 |
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03-21-2013, 07:27 PM
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#2 |
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Registered User
Join Date: Feb 2011
Location: MA
Posts: 116
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Re: TH400 Leak
I can't give you any sound advice for you issue but the TH400 trans began to leak on my 87 GMC V2500. I had the trans pan gasket replaced, some module replaced and it began to leak again a month later. It gradually got worse and I got tired of the leaks in the driveway. I had the trans pulled and all seals and gaskets replaced.
It cost me $1700 and although it was expensive it doesn't leak anymore and I don't regret it. |
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03-21-2013, 07:32 PM
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#3 |
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Registered User
Join Date: Mar 2012
Location: Little Rock, Arkansas
Posts: 770
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Re: TH400 Leak
Be glad my th350 leaks like crazy!! Id just sit under there and try to trace the leak.
Posted via Mobile Device
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1979  Sierra Classic Heavy-half1996 Silverado x-cab "the daily" |
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03-21-2013, 07:39 PM
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#4 | |
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Registered User
Join Date: Mar 2013
Location: Rochelle, Il
Posts: 63
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Re: TH400 Leak
Quote:
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'82 C30 3+3 Dually 454 |
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03-21-2013, 07:58 PM
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#5 |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: TH400 Leak
You can buy every seal and gasket for a turbo 350 for about 25 bucks max. Other than the front pump seal, they can all be easily changed with the trans in place with the most basic of hand tools.
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03-21-2013, 08:40 PM
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#6 |
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Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: TH400 Leak
I've known them, when hot, to blow some oil past the dipstick tube.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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03-21-2013, 09:08 PM
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#7 |
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Registered User
Join Date: Sep 2009
Location: D'ville Georgia
Posts: 470
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Re: TH400 Leak
I wonder if it got hot and some ran out of the vent.
Posted via Mobile Device
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Experience is something you gain when you didn't get what you wanted in the first place. No great defeat was ever just possible in the beginning. |
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03-22-2013, 08:38 AM
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#8 | ||
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: TH400 Leak
Quote:
Quote:
K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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03-22-2013, 07:23 PM
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#9 |
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Registered User
Join Date: Mar 2013
Location: Rochelle, Il
Posts: 63
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Re: TH400 Leak
Except for shifting into drive a little hard it shifts fine so i'm going to keep her topped up for now and will give her a good once over when i get home. Is there a gasket between the transmission and the engine? I looked through my shop manual last night but was dead tired after a 12 hour work day and probably only saw every other word. Thanks
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'82 C30 3+3 Dually 454 |
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