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Old 01-20-2008, 04:13 PM
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Leaking Selector Shaft seal TH350

I have a leak at the selector shaft. I replaced the seal and it is still leaking. It seems hard to believe but could the shaft be worn enough so that the new seal leaks at the rubber? I haven't been able to tell if the leak is coming from the rubber seal to shaft or the outer metal to trans joint.

If the shaft is worn, can the selector shaft be removed by just dropping the pan? Is the shaft available new? If the leak is from the outer metal to trans joint is there a sealant I could put on the outer metal that would work? I may still need to remove the seal someday so I would guess something non-hardening, Or maybe something like Trans Fix that pours into the fluid?

Thanks,

Bill

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Old 01-20-2008, 06:17 PM
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Leaking Selector Shaft seal TH350

yep , you can drop the pan and remove .
did you pop the seal spring off while installing ?
is your vent tube glogged up and not venting ?
try leaving your dip stick lightly loose and watch for leak .
them seals a hard to replace with shifter shaft still in place .
how you get it out ?
may have buggerd the hole .
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Old 01-20-2008, 06:25 PM
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leaking selector shaft

yes the shaft is worn most likely. not to hard to change.drop the pan look how everything is attached its not that hard.you might have to file the end by the threads to get the old shaft out.
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Old 01-20-2008, 06:55 PM
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how did you get the old seal out ? maybe you gouged the bore. anyway, always put sealer on something like that. even if it has sealer from the factory.
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Old 01-20-2008, 09:39 PM
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The trans was rebuilt about 1000 miles ago. It's been leaking since rebuild. I'll pull the dipstick out and check. I guess that will test the vent. Any good ways the clean the vent?

I used a tool, KD Tools 2393, to remove the seal. REAL easy to do. If the link doesn't work, there are several on Ebay search KD 2393 in Ebay motors and you'll see a picture. The tool screws into the seal and then acts as a puller. Took about a minute. I doubt that I damaged anything.

http://cgi.ebay.com/ebaymotors/KD-To...2em118Q2el1247


Edit: I pulled the trans dipstick. Still leaks. The car has not been run for over 12 hours so I don't think pressure in the trans is the problem anyway. I did pull the shaft from an old TH350 case that I have. Easy enough. The shaft on that one looked worn so I guess that is probably the problem with my other one. Now to find a new or good used one. Any idea what they cost new?

I'll also talk to the guy that rebuilt it. Maybe he has one or can tell me where to get one. Maybe a Chevy dealer.

Thanks,

Bill

Last edited by longt; 01-20-2008 at 11:20 PM. Reason: Add info
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Old 01-21-2008, 06:09 AM
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these shafts can have grooves in them , rust pits, damage from some person digging the seal out improperly.

Watch the sharp edges where the linkage items bolt on.

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