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Fighting this for 2 yrs. leaking shifting fork on 400 turbo help

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jamesF:
I'm fighting a leaker too. I installed the "Top Hat" style bushing on the dipstick tube and it still seems to leak just sitting in the garage. I have to get under it to really see if that is where it is coming from. I think it may be something else as I end up with a good sized puddle, and I dont think it is overfilled enough to leak that much out of the tube opening...

One thing I am going to do on this car (67 GTO) is install a drain plug in the trans pan like I did on my 75 Firebird that I put a TH400 into. This car is mostly original but that mod just makes these transmission tasks cleaner.

Cliff Ruggles:
The multiple lip seal doesn't leak easily.  I've been using one since the mid-1980's and my dipstick tube isn't even fastened to the bellhousing and not a single drop of fluid has ever got past one.

I would highly recommend using the fiber pan gasket as well.  I use them here for all the TH400's we do and they will not leak, plus if you use a little RTV to glue it to the pan it can be re-used many times if you need to remove the pan for any reason.

Cork gaskets typically are one use only and I don't recommend them as they tend to squeeze out and get cut easily by factory type metal pans if over tightened......Cliff

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