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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 04-08-2013   #1 (permalink)
stangbang36 is offline Apprentice


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Default Transmission Pan

I cannot keep my transmission pan from leaking. It's been off and on 4 times now, and I've tried both cork and rubber gaskets. Other than skipping a gasket all together and sealing the pan straight to the transmission I'm out of ideas. Maybe that part of the transmission is not level?
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Unread 04-08-2013   #2 (permalink)
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Your pan may be bent or warped,,if you look across the bolt holes at a flat angle,,you may see the pan is bent up around the bolt holes,,take a hammer and carefully tap those areas flat,,,or you could get a new pan,,then don't tighten the bolts too tight,,there is a torque spec for those bolts for a reason,,I use about 110 inch pounds and has always worked,,,
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Unread 04-08-2013   #3 (permalink)
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I checked the pan before putting it on and it was straight. I torqued the bolts down to 10 ft lbs, that's what my transmission manuel said to torque them to.
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Unread 04-08-2013   #4 (permalink)
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Are you sure it's the right pan? There are different pans for a c4
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Unread 04-08-2013   #5 (permalink)
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Yes it's a c4 pan
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Unread 04-08-2013   #6 (permalink)
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There are different pans for a c4 that I've seen some wierd ones over the years especially if its not original
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Unread 04-08-2013   #7 (permalink)
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Quote:
Originally Posted by stangbang36 View Post
I cannot keep my transmission pan from leaking. It's been off and on 4 times now, and I've tried both cork and rubber gaskets. Other than skipping a gasket all together and sealing the pan straight to the transmission I'm out of ideas. Maybe that part of the transmission is not level?
I am having the same problem. I have taken it out twice now. I checked for warp and the bolt hole indentation was considerable, obviously overtorqued. I got it straight and the bolt holes have been pressed back into place. I originally had no sealer as tat i what the rubber gasket manufacturer recommended. It still leaked like a sieve. I tried another gasket same brand ATF. This time I used permatex non hardening sealer. It stanched the flow but still had leakage.

I then parked the car over a cardboard box that was cut open so I could find the leak to a precise location. What I found kind of astounded me. It was leaking out of each bolt hole even though I used sealer around each hole. I am wondering if the bolt holes in the case have been run through into the case where tranny fluid can leak down past the blot threads and out under the lockwasher.

I see no other possible leaks and when it leaks it will leak back to the same level every time, to the top of the pan flange.

My next step is to use sealer on the gasket again, around he bolt holes and then use a sealer on the bolt threads.

I never had this problem on my other c4 mustangs. Then again I had the 67 and 68 model c4 and not a 65. it is possible they had a slight change in the bolt holes and how far they drilled and tapped the holes.

I'l let you know what happens when I try the fix.
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Unread 04-09-2013   #8 (permalink)
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I've recently fitted a new chrome pan, bolts and NAPA rubber seal.

My old pan was warped and the bolts were damaged.

I've only got a slight leak now that I've traced down to what i believe is the dipstick tube.

ATF is quite thin and the leak can look like its coming from anywhere, when in fact its dribbling down to the face of the pan and then onto the ground.

I've got a new o-ring on the way to put in to see if that fixes it.

These C4's can be a pain...
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Unread 04-09-2013   #9 (permalink)
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After dealing with this for years on my '66 289 w/C4 the following finally fixed it:

- a new pan
- a rubber gasket with steel insert, Moroso, I think
- sealant made for trans pans, on both sides of the gasket
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Unread 04-09-2013   #10 (permalink)
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Quote:
Originally Posted by Charles Reeves View Post
After dealing with this for years on my '66 289 w/C4 the following finally fixed it:

- a new pan
- a rubber gasket with steel insert, Moroso, I think
- sealant made for trans pans, on both sides of the gasket
Same here - but did not use a rubber gasket, but a much thicker one than comes with the standard kit (and sealer) - those regular gaskets you get at Autozone don't work too well. The one I got was so thin it was almost like not using anything.

The tranny pans are a PITA - I went ahead and replaced mine with one that had a drain plug so I wouldn't have to go throught this again
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