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#1058953 - 09/04/18 11:20 PM Transmission pan leak  
Joined: Oct 2000
Posts: 1,150
WaSSted Offline
10+ Year
WaSSted  Offline
10+ Year
Member

Joined: Oct 2000
Posts: 1,150
Kennewick
It's been years since I've posted but I'm at the end of my rope with my car. I might put 500 miles a year on it. Anyway 3 months ago I changed the pan gasket cause I got tired of the leak. I cleaned everything. Made sure the stock pan sealing surface was as flat as possible. I used a felpro gasket and tightened in an alternating pattern to I think 12 ft lbs. Drove it and double checked the pan bolts, then parked it.
So it has been sitting all summer. I checked it every month and no leaks, until just recently (last weekend). I don't understand how it leaks when I don't even drive it.

Cork gasket? Silicone? What do I need to do to get this thing to stop? I've been told to get that $250 aluminum pan. But why can't I get the stock pan to seal?

Please help


Kirk Herres
86' SC/SS, 350 Vortec, Rpm intake & Cam, 750cfm Edlebrock Carb, 3" True Duals w/Flowmasters and DR. Gas X pipe, All Autometer Gauges, B&M Hammer Shifter, Accel wires & ign., and 3.73 Posi.
#1058957 - 09/05/18 01:15 AM Re: Transmission pan leak [Re: WaSSted]  
Joined: Dec 1999
Posts: 11,760
86ttop Offline
20+ Year
86ttop  Offline
20+ Year
Member

Joined: Dec 1999
Posts: 11,760
Brooksville, Fl
When a vehicle sits a lot, the torque converter drains out, you may have a leak at the TV cable exit point or possibly the fill tube connection, check out these possibilities!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1058965 - 09/05/18 01:34 PM Re: Transmission pan leak [Re: WaSSted]  
Joined: Jan 2000
Posts: 4,948
mmc427ss Offline
20+ Year
mmc427ss  Offline
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Member

Joined: Jan 2000
Posts: 4,948
Pottstown, Pa
Agree with Leo, those two points are possible leaks to check.
Had similar problem with friends Bowtie Overdrive 200 R, gasket leak. We swapped in my old 200 R pan and fixed problem.
With pan tightening I loosely snug the bolts and then go around the pan several times, not across.
Bob

#1068263 - 10/13/20 06:37 PM Re: Transmission pan leak [Re: mmc427ss]  
Joined: Oct 2000
Posts: 1,150
WaSSted Offline
10+ Year
WaSSted  Offline
10+ Year
Member

Joined: Oct 2000
Posts: 1,150
Kennewick
I finally found the culprit, it was leaking where the speedo cable attaches.


Kirk Herres
86' SC/SS, 350 Vortec, Rpm intake & Cam, 750cfm Edlebrock Carb, 3" True Duals w/Flowmasters and DR. Gas X pipe, All Autometer Gauges, B&M Hammer Shifter, Accel wires & ign., and 3.73 Posi.
#1068264 - 10/14/20 12:02 AM Re: Transmission pan leak [Re: WaSSted]  
Joined: Apr 2009
Posts: 845
Fred SS Offline
10+ Year
Fred SS  Offline
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Member

Joined: Apr 2009
Posts: 845
Glassboro, NJ
Great that you found the leak. Do you know what size O-ring? That is something I need to replace too.


87 SS, Harwood cowl induction hood, UMI trailing arms. Edelbrock TES Headers (Jet Hot Coated). Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, Bilsteins, TCI 2400 stall converter, Ramcharger fans, Denny's 3.5" Driveshaft, GBodyParts GNX Wheels.
#1068265 - 10/14/20 12:06 AM Re: Transmission pan leak [Re: Fred SS]  
Joined: Oct 2000
Posts: 1,150
WaSSted Offline
10+ Year
WaSSted  Offline
10+ Year
Member

Joined: Oct 2000
Posts: 1,150
Kennewick
No clue. I found a kit on Amazon for 15 bucks


Kirk Herres
86' SC/SS, 350 Vortec, Rpm intake & Cam, 750cfm Edlebrock Carb, 3" True Duals w/Flowmasters and DR. Gas X pipe, All Autometer Gauges, B&M Hammer Shifter, Accel wires & ign., and 3.73 Posi.

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