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-   -   Three damaged Th350s in Row ? (

68HellCo 10-22-2010 10:08 PM

Three damaged Th350s in Row ?
I have put two rebuilt th350 trannys in and each got ate by a bad torque converter (I thought) that munched the pump. Then I had another highly reputable builder build a third t350 and HE installed it with a new torque converter, and the pump sounds fried again, that high-pitched screeching started right away, the one that gets louder as car is revved up. I don't know what is going on exactly. I do see what looks like a little bit of forward-to-backward movement at the flexplate and torque converter. The gap was perfect between the flexplate and the torque converter, just shy of 3/16. It's mated to a '69 Chevelle 350 motor that I took from my running '69 and put into my '71 Chevelle.

SSedan64 10-22-2010 10:49 PM

Did you flush the Trans cooler & lines?

booboonani 10-23-2010 12:39 AM

have you changed the fly wheelsome times you cant see the flex in the fly wheel i have changed fly wheels out that were bad causeing damage to trans might try this to fix your problum ;)

tnsmith10 10-23-2010 06:15 AM

both dowel pins in place?

68HellCo 10-23-2010 01:42 PM

I forgot to flush the lines and cooler on transmission No. 3 and started it and ran it for a few minutes, then went back to flush it. Culprit?

68HellCo 10-23-2010 01:44 PM

Oh, changed to brand new flywheel and transmission pins were perfectly in.

The Factory Man 10-23-2010 07:04 PM


Originally Posted by 68HellCo
I forgot to flush the lines and cooler on transmission No. 3 and started it and ran it for a few minutes, then went back to flush it. Culprit?

Flushing the trans cooler is important because alot of crap gets into the cooler when you have a failure. If you install a new trans all that garbage gets returned to the new transmission and you have another failure!

68HellCo 10-24-2010 01:36 PM

OK, last question ... if shrapnel got into transmission and killed pump, what part of that tranny is salvageable for next build? And is torque converter usable and do I have to have all this stuff cleaned out in a particular way? I put about 5 miles on the tranny around town before it squeeled like a pig. Thanks, guys!

booboonani 10-24-2010 09:29 PM

If It Were Me I Would Have Your Converter Checked Before Re Useing It Ya Every Thing Else Needs Tore Down A Washed Good

68HellCo 10-25-2010 11:56 AM

Thanks about the checks on torque converter and parts, man. Will do. :)

booboonani 10-25-2010 12:52 PM

thats cool good luck hope every thing works out this time around

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