65GS.com - Buick Gran Sport Enthusiasts!
Drivetrain => Transmissions => Topic started by: Brian on September 17, 2012, 09:06:50 PM
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How is everyone sealing the transmission pan to their ST300 auto transmission. My '66 gets driven very little (once every couple months), and in the 25 years I have owned it, I have never been able to get the pan gasket on the trans to no leak when sitting around. I have one of the composit rubber gaskets on it and that has worked best (compared to the cork gaskets). Has anyone ever tried putting the pan on with a thick bead of silicone RTV with no gasket installed? I know that is how alot of modern engines and transmissions seal their joints now and it works very well.
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Mine also seems to leak from the band adjustment port as well as the transmission pan! I want to to fix this all at once when under there, and am very interested in the answer to Brian's question.
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Brian
Me too.
Milton
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I generally use a THIN layer of silicon on my gaskets as an adhesive and to fill pinholes. Also makes removal and future clean-ups much easier.
My Special had an annoying leak at the o-ring seal on the (servo cover?)
My final solution was to install a 5 speed. :icon_biggrin:
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I had a 68 300 that was a reak leaker, turned out to be the connector for the kick down, I bought a new one from a local trans supplier for $3.00 and it stopped 99% of the leaks, thanks Bill.