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-   -   TH350 Leak (

just_football 09-19-2003 01:58 PM

TH350 Leak
I have a TH350 tranny in a 74 Chev C20. The leak seems to be coming from the linkage shaft where it enters the tranny. Any suggestions? I'm not real mechanically, is this something I can do myself or should I take it to a shop?

Bumpstick 09-19-2003 08:49 PM

It has a small seal but it requires removal of the pan and the linkage internal... You can then pull out the shaft and replace the seal which is very small and replace the linkages and pan and refill and be on your way... :) Just take care as to the disassembly of the linkage pieces and its no big deal... ;)

BT61 09-20-2003 06:29 AM

There is a tool made to replace the seal from the outside, without removing the pan. I've used one at work a few times with good results. I believe it's made by KD Tool.

adtkart 09-20-2003 08:31 AM

BT is right. Usually the tool comes with a tool for removing the seal and a tool to re-install the new one. It is relatively easy to do and does not require removal of the pan. If you are removing the pan to change the fluid, it can be done the other way, but that usually means laying under the dripping fluid to change it. You also have to be careful to make sure you get the linkage and manual valve hooked up right.

Jason 09-20-2003 12:15 PM

You could do it the backyard way:nono: Take a few small sheet metal screws and screw them into the seal, take some diagonal wire cutters to pry up on the screws and pull the seal out. Drywall screws work. Be careful not to scratch the case. Install the new seal being careful of the flats on the shaft tearing it, tap it in with a 9/16 deep socket.
Make sure no one has installed two seals, if so remove both.

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