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Old 11-27-2007, 10:47 PM
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Transmission vibration

I have a TH 350 Tranny in my 1985 G20 Sportvan. I have been getting a vibration that feels like some type of cavitation shimmy as I accellerate. The fluid is good. I also am getting some squeaking sounds through the drive shaft (sounds like someone bouncing on the bumper of a car with bad springs)

Any ideas?


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Old 11-27-2007, 11:25 PM
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You more than likely have a transmission that is fine, you have a U-joint that is bad. take it in and have the driveshaft checked. It always slays me how a U-joint bearing that has such little movement can make so much noise when they go dry................
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Old 11-27-2007, 11:53 PM
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Transmission vibration

Definitely worthwhile to just go ahead and replace both frt. and rr. u-joints if lots of mileage on it. Also-quite inexpensive-about $30 (or less) for both parts and pretty easy d.i.y. project. Minimal tools needed.(Snap-ring pliers for the keepers,bench-vise,little else) A chiltons manual for your van would explain it in detail.(around $14.95)- A small investment for peace and quiet, and to prevent premature failure of trans output shaft bearing/rearend yoke-pinion damage,etc...- -Jim
PS: (a big contributing factor to the u-joint's life is engine-idle speed-I had to do mine on 95 c-vic police- just after problems w/ idle-air control valve failure caused extreme high idle a few times-thus causing it to "slam" into drive ONLY A FEW TIMES. {I must add that they also had alot of miles on them-but this certainly hastened their demise} The Frt.u-joint fell apart during disassembly it was so damaged!Good idea to check that your idle speed is not too high, for this reason)
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Old 11-28-2007, 04:30 AM
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The squeaking or rattling sound could be a cracked flex plate. Common problem, particularly if the torque converter bolts loosen and have been like it for a while.

They rattle quite loadly as the crack increases in length. They usually crack from either the torque converter mounting bolts holes or from the crankshaft bolt holes. The cracks are easy to spot because there will be a rust line along the crack.

While you are under there looking for cracks, check that all the bolts are tight.

The vibration under acceleration tends to point to a bad uni......probably at the tranny end. If the vibration is there all the time but gets worse at speed then it is probably the rear uni..

Hope you find the problem or problems........Barry.
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