Diseazd Posted October 27, 2012 Share #1 Posted October 27, 2012 Just fixed another mystery clunk. My 72 (green) just developed the dreaded clunk. No problem, I've got a R/T mount so it's got to be the half shaft u joints. I pulled 'em off and had them replaced. Took her for a drive looking for a nice quiet ride......not. The clunk was still there. I put it back on the lift and wrenched the driveshaft around......must be in the drive shaft. While it was up on the lift, I checked for loose bolts. The mustache bar (two vertical bolts) were tight as a tick as well as the big control arm bolts. The two bolts from the back of the diff were pretty tight too, I could only get a quarter of a turn. I decided to drive her again before pulling the drive shaft to replace those u joints.......clunk is non existent. A tiny back off of the two diff bolts had caused a good clunk. Just a heads up to anyone who is blaming their clunk on diff, driveshaft or half shafts. Check torque on all major nuts in the rear......could save time and money. Link to comment Share on other sites More sharing options...
madkaw Posted October 27, 2012 Share #2 Posted October 27, 2012 Yep,I just posted this the other day. It only takes just less than a 1/2 turn on the diff mounting bolts to create a clunk. The ONLY way to tell is get a wrench out. I think folks like me that have had the diffs out on several occasions find that the STUDS are actually loosening causing the nut to be loose. Time to get the loctite red out and squirt those studs in place. Link to comment Share on other sites More sharing options...
Diseazd Posted October 27, 2012 Author Share #3 Posted October 27, 2012 Right Steve.....that's what amazed me......barely a 1/4 turn of tightening.....it sounded like a bad u joint. I would never have thunk it! Good advice on big red. Link to comment Share on other sites More sharing options...
olzed Posted October 27, 2012 Share #4 Posted October 27, 2012 I have a persistant clonk, so I'll be checking on my diff nuts.Any idea what the torque on these nuts should be? Link to comment Share on other sites More sharing options...
ninjazombiemaster Posted October 28, 2012 Share #5 Posted October 28, 2012 If I had a dime for every clunk my car made, I could afford to repair them.... Link to comment Share on other sites More sharing options...
jalexquijano Posted August 3, 2015 Share #6 Posted August 3, 2015 I have a clunk sound that appears whenever i lift the accelarator pedal at slow speeds. I believe it comes from the rear suspensión. Could this be transmission mount seal? I will take the car to the mechanic so he can lift it on the elevator. Any clues?? Link to comment Share on other sites More sharing options...
Persimmon240 Posted August 3, 2015 Share #7 Posted August 3, 2015 olzed, My shop manual indicates that the "Gear carrier to rear differential mounting member lock nuts" should be torqued to between 54.2 and 68.7 ft-lbs - or, if you prefer metric, 7.5 to 9.5 kg-m Link to comment Share on other sites More sharing options...
jalexquijano Posted August 3, 2015 Share #8 Posted August 3, 2015 So i must verify the rear differential mounting seal??? To be sure its tight enough? Link to comment Share on other sites More sharing options...
rcb280z Posted August 4, 2015 Share #9 Posted August 4, 2015 Diseazd, when you say "clunk", when were you hearing it? I have a clunk sound now but not all the time. Mostly when making right turns, when there is less torque, while driving over uneaven rough roads, and those little round dome shapped lane dividers (don't recall the proper name). Trying to find where mine is coming from but already checked everything mentioned and then some. Even looked for a busted strut. Link to comment Share on other sites More sharing options...
Zed Head Posted August 4, 2015 Share #10 Posted August 4, 2015 classiczcars people! jalexquijano has resurrected this thread, from dead. The last post was October 2012 before he began resuscitation. ~2.75 years ago. 1 Link to comment Share on other sites More sharing options...
EuroDat Posted August 4, 2015 Share #11 Posted August 4, 2015 jalexquijano, I think you should be checking all the bolts are tight and the diff mount for starters. If the diff mount is old it will sag and cause these kind of noises. The two big nuts on the back of the diff cover often cause this noise. Link to comment Share on other sites More sharing options...
jalexquijano Posted August 4, 2015 Share #12 Posted August 4, 2015 Taking the car to the elevator this friday and will let all of you know!! Will take pictures while there! Link to comment Share on other sites More sharing options...
Parman
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