All: Since installing the correct factory kick-down cable in my TH350, it leaks from the cable hole in the trans case. The OE (used) cable housing is steel and fits quite snuggly. I used an O ring from a variety pack I had on hand. When it began to leak, I took it all back apart, and noted the O ring was torn. I replaced it with a new O ring from a different source, and this time used a light coating of "NAPA Good Stuff" black RTV above the O ring seat on the cable housing. It slid in nicely. I snugged the retaining bolt down noting a tiny amount of sealant squeezing out from the cable housing bolt flange. I then waited 24 hours before refilling. It did not leak and remained that way while undriven. I did a shake down run Sunday for about an hour. I have a leak again. Question: Do I need to be very specific with O ring rubber arounf ATF? Does ATF eat silicon/RTF? That NAPA GOOD STUFF wasn't cheap. I though I bought since it was recommended elsewhere.
The o-rings you used may not be neoprene. When I went to Buick power I had to replace that o-ring. I bought it from a transmission shop just to be certain it was the right kind.
ATF should not hurt silicone o-rings unless the fluid has silicone in it. I'd figure the black RTV alone would have been a solid fix. Is there a chance it is coming from some where else? Have you put dye in the trans and tracked it?
