CHEVY HARD SHIFTING

1992 Chevrolet Suburban

Tiny

Jakeneedshelp

September, 27, 2010 AT 10:21 PM

Transmission problem
1992 Chevy Suburban V8 Four Wheel Drive Automatic 315000 miles

When I shift into reverse, primarily when vehicle facing downhill, I hear a loud clunk. I suspect the transmision. So I had 2 diff friends listen to the clunk. They hear it from the rear end of the vehicle. So I replaced the U joints in hopes. That didnt do anything to help. Still shifts hard. But sound comes from the rear of the vehicle. Any help would be greatly aprreciated. How do I fix/check a rear end or tell if its the trans?

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7 Answers

Tiny

madmike1735

September, 27, 2010 AT 10:26 PM

Check for freeplay in your pinion. (Grab the yolk and look for freeplay in and out). Let us know what you find there.

Tiny

Jakeneedshelp

September, 27, 2010 AT 11:01 PM

I did that when I redid the u joints. It has a little bit of play but not very much. Old guy I was with said mine looked normal.

Tiny

Jakeneedshelp

September, 27, 2010 AT 11:03 PM

How much freeplay is normal?

Tiny

madmike1735

September, 27, 2010 AT 11:06 PM

Anything you can see, or feel is to much. The endplay is set to such tight tolerances, that any play felt will verify a problem.

Tiny

Jakeneedshelp

September, 27, 2010 AT 11:23 PM

Id say there was a least a 1/4 inch play. So whats my next step? And thank you

Tiny

Jakeneedshelp

September, 27, 2010 AT 11:25 PM

And why would the CLUNK sound come from the rear?

Tiny

madmike1735

September, 29, 2010 AT 7:12 AM

Remove the rear diff cover. It is possible that a tooth has broken on either the ring gear, or spur gear. That would def. Cause a clunk. Let us know what you find.

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