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Old 02-01-2003, 03:42 AM
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Post th350 rebuild

I'm getting ready to rebuild a th350 that was from a 6 cyl. car. It will be installed in a mild 400 engined 69 firebird. Ive been told that a th350 for an 8 cyl car has more has more clutch plates than one in a 6. Is this just a matter of installing more plates or is there more to it than that. or should i just rebuild it as is? I have no plans on making mega power with this car, as its the wifes driver that I sometimes take out for some abuse. Also I'm going to buy a new converter what stall speed converter would be a good choice and what manufacter sells a reliable peice? thanks in advance Ben

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Old 02-01-2003, 04:52 AM
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The V8 TH-350 does indeed use more clutches than the 6 cylinder application. The good news is that all you'll have to do is replace a couple of the pistions (which are interchangeable from the V8 models) and add the extra clutches and steels to wind up with the V8 version.

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Old 02-01-2003, 05:34 AM
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Pistons? where can I find more info on this? I've rebiult motors and I feel as thou I'm very mechanically inclined, do you think a trans rebuild is something most anyone can do? My major concern is the modifications that need to be done, if it were as easy as taking it apart and putting it back together with new parts i feel i could do it, but I would need more input on the mods that need to be done. What about the converter?
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Old 02-01-2003, 05:53 AM
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the pistons in a T-350 are aluminum.....they can be chucked onto a lathe and turned down so 5 frictions and steel plates fit in the forward and direct drums. If your setup is 4 frictions, measure the thickness of the friction and steel plate , then cut the piston down the needed amount.

Or some tranny shops used to keep cut down pistons on the shelf for an exchange basis. This may not be true in todays world since the T-350 is hardly a main stream / daily driver tranny any longer.

The direct piston thickness is .700 for 5 friction/steel plates. Assemble the packs 'dry' with no seals and check clearances first. After clearance is set, assemble all of the pieces.

You will want 3 frictions in the intermediate clutch pack. most 6 cyl trannys had 3 frictions in the intermediate pack.

Dont worry how old you are... it is the mileage on your body that adds up.
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