72 Auto CLUNK when putting in gear
Thread Starter
Cruising
Joined: Sep 2004
Posts: 13
Likes: 0
72 Auto CLUNK when putting in gear
I get a LOUD CLUNK when shifting into drive or reverse from park or neutral. Does not clunk or chatter in turns. No unusual diff noise while driving or turning. Ring & Pinion backlash is less than 0.100". New Posi dope w/additive, New U-Joints all (6), Trailing arms have been rebuilt with new bushings & wheel bearings, All rear suspension rubber bushings have been replaced. Rear diff case is not cracked or broken. ALL bolts have been checked and rechecked for tightness. Trans just rebuilt and very carefully checked for tolerances. Trans output yoke tight and not broken. Any help would be greatly respected.
Al
Al
Melting Slicks
Joined: Aug 2004
Posts: 2,063
Likes: 1
From: Beverly Massachusetts
i had this prob. on my 76 turned out to be the bolts that hold the rear dif to the frame. they were not tourqued to specs. took me about a month of 
befor i found the prob. hope this helps. 
mike
befor i found the prob. hope this helps. mike
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
The easiest way to see where the clunk is coming from is to take it to a garage that has a lift you drive onto and with the wheels chucked and the brake applied, out the transmission from forward to reverse and see where the noise is coming from. It sounds like u-joints, but also check the front of the differential mount to see if it shifting there where the bushing meets the frame 
Racer
Joined: Nov 2001
Posts: 478
Likes: 3
From: Huntsville AL
I have the same problem with my auto. Have checked everything, can't find anything external to the rear end 
I figured it was the gear wear internal to the rear end, guess that will be a winter project. 
YBnormal...drive a vette
I figured it was the gear wear internal to the rear end, guess that will be a winter project. YBnormal...drive a vette
Instructor
Joined: May 2002
Posts: 192
Likes: 0
Hey Van Steel...How hard is it to change the trans mount bushings ?
Can I do it in my garage, on my back ? Does the trans need to be lifted or supported by a jack ? I think I have the same 'Clunk'
described here.
Edit: What bushing is that ? It's not for the trans is it ?
Can I do it in my garage, on my back ? Does the trans need to be lifted or supported by a jack ? I think I have the same 'Clunk'
described here.
Edit: What bushing is that ? It's not for the trans is it ?
Last edited by Blackened 79; Sep 27, 2004 at 10:42 AM. Reason: left out some info
Le Mans Master
Joined: Jun 2004
Posts: 9,289
Likes: 16
From: Skippack PA
St Jude Donor '13
I replaced the tranny mount on my 80 auto over the weekend. My car had also been thumping hard when putting into D or R. While it still bumps a little, it's MUCH better with the new mount. But considering the old mount was separated that's hardly a surprise...
I was able to change the mount laying in my driveway using a jack to lift the trans.
I was able to change the mount laying in my driveway using a jack to lift the trans.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
