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03-31-2018, 08:03 PM
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#1 |
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Registered User
Join Date: Sep 2016
Location: Cleburne, Texas
Posts: 79
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On the 3rd trans pan and!
I have a 86 GMC pickup with a 350 auto and I am leaking transmission fluid while driving.
I am on my third transmission pan trying to stop a fluid leak. It leaked on the original pan, a chrome one, and now a thicker aluminum pan. Today I started driving to a car show and it started fogging smoke out from underneath the back of the truck. This time I used a thirty dollar gasket between the trans and the pan! You know the thought, the more it cost the better it should be! I am thinking there must be some pressure build up causing the fluid to be pushed by the gasket! Any suggestions what to look for would be greatly appreciated! |
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03-31-2018, 09:37 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,533
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Re: On the 3rd trans pan and!
Check the vent is clear.
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03-31-2018, 09:40 PM
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#3 |
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Registered User
Join Date: Sep 2012
Location: Idaho
Posts: 630
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Re: On the 3rd trans pan and!
Maybe the leak is coming from the shift rod seal. Maybe the seal was never installed?
__________________
'81 K20 Silverado , '99 Dodge Cummins 4x4, '05 Dodge Cummins 4x4, Pinstriping-Lettering-Specialty Painting |
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03-31-2018, 10:00 PM
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#4 | |
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Registered User
Join Date: Sep 2016
Location: Cleburne, Texas
Posts: 79
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Re: On the 3rd trans pan and!
Quote:
Thanks! What vent are you talking about? |
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03-31-2018, 10:13 PM
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#5 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,927
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Re: On the 3rd trans pan and!
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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03-31-2018, 10:13 PM
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#6 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,608
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Re: On the 3rd trans pan and!
are you sure its the pan leaking?...I don't see how you could build pressure in the pan without it blowing out the dipstick tube ...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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