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TH350 Transmission leak

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TH350 Transmission leak Empty TH350 Transmission leak

Post by rogal_tx on Fri Jun 03, 2011 7:57 am

Hi, I've got 1973 Malibu with auto TH350 and I got leak that I can't find solution for it. On the driver side there is a shaft (linkage) that comes into transmission which shifts gears (from P do D etc.). I've got oil dripping out of that spot. It’s probably something easy to fix but I can’t find solution to stop the leak. Did anyone have this problem? Any help is appreciated.
Thanks
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Post by JB2wheeler on Fri Jun 03, 2011 9:49 am

I dont know, but I have a feeling you will have to tear down the whole transmisson to put in a 10 cent rubber seal. JB
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Post by abajc3 on Fri Jun 03, 2011 9:56 am

JB2wheeler wrote:I dont know, but I have a feeling you will have to tear down the whole transmisson to put in a 10 cent rubber seal. JB

yeah, that just might be the case. if im not mistaken, that shaft can only be removed from the inside of the housing

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Post by rogal_tx on Fri Jun 03, 2011 10:25 am

Man, I hoped to avoid that but sounds like thats the only solution.
Thanks for help
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Post by Pdawgie on Fri Jun 03, 2011 12:29 pm

You don't have to remove the shaft to change the seal, but you do have to have a specialized tool for removal (looks like a socket with threads on the outside). I haven't seen the tool at regular places. It shouldn't cost very much to have that seal changed at a tranny shop. If you do do it yourself be very careful... one tiny nick on the seal and it will continue to leak.
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Post by rogal_tx on Fri Jun 03, 2011 12:57 pm

Thanks, I will try tranny shop first just because I don't have that specialized tool and it's probably not easy to find either.
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Post by pila on Sat Jun 04, 2011 1:45 am

Just get an oil & filter change, and tell them "oh, by the way, change the selector shaft seal while you are in there" Very Happy The TH350 is easy to work on actually, and I've rebuilt a few, but it does require some special tools.

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