Trans or something else?
 

I have a 1969, 350, Automatic

I have noticed more and more that when I shift from park to reverse or drive that I get a nice clunk from the rear wheels area, more so when going into reverse. Is tis a transmission problem or something else ?

I would check your u-joints but Vettes are known for their harsh shifting into reverse causing a little clunking sound.

Driveshaft u-joints! Jack car - Neutral selected - Rotate driveshaft by hand and look for loose u-joints. :thumbs:

If you find that the U-joints are ok, check the diff upper and lower cushions. Mine were worn out and just recently replaced, made a world of difference.

Good luck,
Dino

:iagree:

Thanks everyone, I start withe the u-joints, after reading service manual thats what I think also, Thanks again

The most likely culprit is the rear end bumper pad. It is easy to check. Just have someone shift it from drive to reverse and back while you look underneath. MAKE SURE THEY KEEP THE BRAKE APPLIED! (use the e-brake, if yours works) If the bumper pad is bad, the rear end housing will "twitch" up and down as the tranny is shifted. If the pumpkin doesn't move, it's U-joints.

The most likely culprit is the pad that absorbs the shock on the front differential bracket. The rubber part you can see will look good but the pad that you can't see will be worn out and allow the front fiff to clunk against its support when you shift from forward to reverse. This is also easier to check and change than your u-joints.
Bernie

BerniesVette and 7T1vette are you guys talking about the same pad?

Is it located car forward of the differential?

Thanks guys

Yes they are talking the same pad and its a good candidate. When you check the U-Joints, use a floor or bottle jack to raise the trailing arm to unload the half shaft, then check the jount. With it loaded you may not see the wobble in it

SIXFOOTER
Thanks, I was going to ask about that.
Also if it is the ujoints should I replace all 6 since I'm under there or just the 2 or 4. Whats the best way.

I believe that once you replace the front differential mount bushings your problem will be solved!:thumbs:
Bernie