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#1 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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leaking transmission pan
So I have a PML cast aluminum transmission pan (http://www.yourcovers.com/transpan_9684.php) and grabbed a rubber transmission pan gasket from Autozone. I put the gasket on dry and torqued it to spec. I filled the transmission with Vavloline Max Life Dex/Merc fluid. However, the pan is leaking at the back along the gasket. There do not appear to be any instructions online for installing the pan. Should I use RTV instead of a gasket or use something other than a rubber gasket? Should I use a combination of RTV and the gasket?
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#2 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: leaking transmission pan
Rubber gasket should seal by itself. Check your torque again.
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Beat it to fit, Paint it to match... ![]() |
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: leaking transmission pan
are you sure you cleaned both mating surfaces good and did you check the new pan for casting lines and casting flash?// should b no problems with a good cast pan and rubber gasket
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#4 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: leaking transmission pan
Pulled the pan and checked both the pan and transmission surface. Both are straight and clean. Put the pan back on and torqued to 12 ft lbs. The pan still leaked so I tightened just little bit more. The leaking slowed down but not completely. There is still a bit of seepage. I have a cork and rubber gasket on order and will try that one.
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#5 |
ENGINE BUILDER
Join Date: Apr 2006
Location: Shortsville n.y.
Posts: 344
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Re: leaking transmission pan
Which transmission do you have?
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JIM ZAG |
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#6 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: leaking transmission pan
I have a TH350.
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#7 |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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Re: leaking transmission pan
Next time you have the pan off and clean of all gasket material, I would use a straight edge on the gasket matting surface to make sure its flat and level. Other than that I would contact the company you bought it from.
These covers do not look cheap! So they should have some kind of customer support behind them. Good Luck.
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Coming Soon: Project 1970 Country Truck |
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#8 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: leaking transmission pan
I did check the pan and it was straight. I will have the pan off again tonight and will check the transmission. The customer support for the pan has been good. They did recommend a rubber/cork gasket which I will try tonight.
I did have a bolt hole in the transmission, in the area of the leak, strip out which I tapped to 3/8" and is fine now. I really don't think this is causing the leak though since I can get the correct torque on the tapped bolt hole. |
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#9 |
Registered User
Join Date: Sep 2008
Location: Santa Rosa, CA
Posts: 451
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Re: leaking transmission pan
I am having the same issue. Have you checked the shifter shaft o-ring? when it leaks it runs down to the pan gasket area and looks like a pan leak.
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Northern California Group Met list: Cyclone, KCJones, TranzAm, extd56, hotrodhomi, mnky30, Rokcrln, Brad, JerryJones, Petey-pablo, 72Subby |
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#10 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: leaking transmission pan
I have looked quite closely at the entire transmission but will check again.
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#11 | |
Registered User
Join Date: Oct 2009
Location: LBC California
Posts: 497
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Re: leaking transmission pan
Quote:
Any follow up? Where was the leak coming from?
__________________
- 1967 Chevrolet C/10 SWB fleetside (New Project). ![]() - 1969 Chevrolet C/10 SWB fleetside (SOLD) ![]() - 2000 Ford Mustang 232 (DD) - 2003 Ford SVT Cobra "Terminator" 281 (Once in a blue moon driver/weekend driver) |
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#12 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Re: leaking transmission pan
I did find that the gear selector shaft seal had not been replaced when the transmission was rebuilt. Real pain to spend a bunch of money on having a transmission rebuilt and the rebuilder does not even bother to replace that seal.
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#13 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: leaking transmission pan
I'm having the same issue and taking my truck tomorrow to a transmission shop owned by a friend of a friend. I think mine is leaking from the gear selector seal also. I'm not sure but I think a special tool is necessary to replace that seal.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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