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1992 Chevy Suburban Hard shifting

Tiny
JAKENEEDSHELP
  • MEMBER
  • 1992 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 315,000 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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Monday, September 27th, 2010 AT 10:21 PM

7 Replies

Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
Check for freeplay in your pinion. (Grab the yolk and look for freeplay in and out). Let us know what you find there.
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Monday, September 27th, 2010 AT 10:26 PM
Tiny
JAKENEEDSHELP
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  • 6 POSTS
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.
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Monday, September 27th, 2010 AT 11:01 PM
Tiny
JAKENEEDSHELP
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  • 6 POSTS
How much freeplay is normal?
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Monday, September 27th, 2010 AT 11:03 PM
Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
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.
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Monday, September 27th, 2010 AT 11:06 PM
Tiny
JAKENEEDSHELP
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  • 6 POSTS
Id say there was a least a 1/4 inch play. So whats my next step? And thank you
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Monday, September 27th, 2010 AT 11:23 PM
Tiny
JAKENEEDSHELP
  • MEMBER
  • 6 POSTS
And why would the CLUNK sound come from the rear?
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Monday, September 27th, 2010 AT 11:25 PM
Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
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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Wednesday, September 29th, 2010 AT 7:12 AM

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