General Category > Quadrajet Carb Talk and Tips

th350 question

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Cliff Ruggles:
In all the years I've been doing transmissions I had one TH350 that didn't work after putting it together.  Ended up being a snap ring that I didn't get seated well getting kicked off the drum and the spring cage/apply piston followed it.

I've seen a few TH350's come in here not working due to clutches not applying even though they were assembled correctly. The culprit was a failed bushing (prior to the rebuild) on the direct drum allowing it to contact the support and wear the sealing ring grooves so hard that they held the rings from expanding.  The inside of the drum was also worn and grooved pretty bad in each case and the builder didn't catch it.

I've had almost perfect success with TH400's, the one unit that didn't work pushed the snap ring off the PR valve, and was a very easy fix when the pan was dropped for inspection.......Cliff

stevef:
Interesting to hear about the things that go wrong, so those are more things to look for. I installed all new bushings, so don't think I have a problem there. I have a couple of parts transmissions to choose the best looking parts from, so I didn't use any parts that showed wear, not that there were many that showed wear.

One other thing that I remember was that I bought a new sprag, and while getting ready to install it, a couple of rollers fell out. But I put them back in the sprag and it fit tight and seemed to function fine.

I have a bunch of 70's project cars, and most use th350's, so I'd like to get good at rebuilding them.

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