1989 Chevy C1500 Rear Thunk

GMC C1500
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DBERTI
  • MEMBER
  • 1 POST
Hi,
I have a 89 checy C1500 2wd. Sometimes when I stop I get a thunk that sounds like its coming from the rear end. The sounds also occurs from taking off as well (sometimes). The rear brakes have been completely re done and just put in an new drive shaft and u joints. I checked the leaf springs and none are cracked or broken but the bushings are quite dry, I dont see any wearing on the axle. Any Suggestions would be greatly appreciated.
Apr 3, 2006 at 2:01 PM
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BURRBRIAN
  • ✓Experienced Mechanic
  • 158 POSTS
I can't say just what it is but you might check and see if your tranny has some play in it when you put it in park see if it lets it move some before catching.
There may be something inside that is giving you this slack which would catch suddenly when you take off.
Possibly this noise is coming from the tail end of tranny instead, just something to check and possibly elimenate as cause of your problem, at least. LUCK! :D
Apr 4, 2006 at 1:16 AM

Suggested Repair

Check the transmission for excessive play or slack when shifting into park. The thunk on stop and takeoff may be coming from the transmission tailshaft rather than the rear axle.

Conversation Summary

The owner of a 1989 Chevy C1500 2WD reports an occasional thunk from the rear when stopping and sometimes when taking off. Rear brakes, the driveshaft, and U-joints have already been replaced; leaf springs are not cracked, though the bushings are dry, and no axle wear is visible. The expert suggests checking transmission play in park and possible slack at the transmission tailshaft.

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