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Old 10-20-2005, 05:47 PM
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TH350 - no movement

I have a 72 Buick GS 350 with a TH350. I recently took out the engine and transmission for a good cleaning and all new seals and gaskets. I get it all put back together yesterday. Took it for a drive everything was perfect until I slowed to almost a stop and when I took my foot off the brake, I had no drive. Tried reverse, nothing. Tried 1 and 2, nothing. Basically I have Park and 5 neutrals. Never gave any warning, no slipping, no noises.

The fluid was a little high, so I used a vacuume to siphon some out. But still nothing. I thought once it cooled off I might get something, but today still no catch in any gear.

Now this is when I got my service manual out.. doh... The only thing I can see that I have done wrong is I have the cooling lines to the radiator mixed up. The fluid should flow from the transmission to the top of the rad, down through the rad, and back. The way I have it is that it flows to the rad and has to be pushed up through the rad and then back. Would this really have a harmfull effect? The only seals I did were the front and rear shafts. I did remove the bolt from the selector linkage to remove that seal but it looked too good to mess with so I put the selector bracket back on.

Im ready to take it out again but if someone can tell me anything to try first it would be great. Thanks guys.
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Old 10-20-2005, 06:33 PM
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where the cooler lines run ( top or bottom) have nothing to do with the tranny operating. There should be no check valve in the cooler system.

you need to verify the tranny has oil pressure.

The rear plugged port on the passenger side near the vacuum modulator will give you a main line pressure reading. A 0 - 300 psi guage will do the job
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Old 10-23-2005, 08:08 AM
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No Pressure

Well I didnt need a pressure gage. I corrected the lines. Still nothing. So I removed the lines from the radiator and started the engine, not a drop of fluid came out. I guess I'll be taking the transmission out today...
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Old 10-23-2005, 10:56 AM
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Quote:
Originally Posted by 72BuickGS350Conv
Well I didnt need a pressure gage. I corrected the lines. Still nothing. So I removed the lines from the radiator and started the engine, not a drop of fluid came out. I guess I'll be taking the transmission out today...
No oil from the cooler lines is a good indication that pump is not operating or something is plugged up.

good luck
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