So I have had this issue a while now and although it doesn't seem to be upsetting the car at all I am curious as to what it might be.

2002 MN6 (stick shift) just over 100,000 on it now.

Symptom: any gear increase speed or decrease speed quickly (get on or off the gas quickly) which causes a weight shift causes a driveline clunk or bang noise. Quite honestly like something is loose and has slack in it. Hard to tell where it is coming from. Possibly torque tube? I had the problem before and after the supercharger & clutch install 3 years ago. Ideas guys? I was thinking of jacking it up but honestly don't see how that would help much getting under it because it doesn't make the noise going in or out of gears. It makes the noise once already in a gear and then either quickly accelerating or letting off the gas when the weight shifts from front to back or back to front.

I checked the axle nuts...those are tight at 120ft/lbs.
I guess I can jack it up and put it in gear and see how much slop there is when turning a rear wheel by hand? Would that indicate bad CV joints?

Any help appreciated. Had it on the track and it seemed fine but it does still bother me to hear it. When I rock the car back and forth by getting on and off the gas you can hear it bang, clank, bang, clank...like a loose something.

 

Thats my guess too. I'd check those CV joints

 

CV Joints are TOUGH and are hard to show failure. They show failure under LOAD!


Try this:

Jack the rear and place on stands. Have some one assist and start the engine. While you watch the CV Joints, Rear Hubs and diff mount, have them press HARD on the brake and either lightly rev the engine and engage the clutch to torque the drive train or power brake the drive train if its an auto. That TORQUE will cause the drive train to stress and show ANY lost motion or play.. Do it in drive and reverse.

NOTE! The CV Joints should have very very little or NO PLAY and NOT make any noise.


My guess would be a bad TT Coupler!!

Bill

 

ALSO,,,,,,,,,,,,,,,,,,,,,,, Inspect the area where the inner CV shaft enters the Diff on each side of the diff . When you torque the drivetrain or rotate the CV Joint, that part of the CV joint that goes into the diff should not have a lot of deflection.

You can also grab the inner hub and yank up and down on it to see if it has excessive slop.

Bill

 

Thanks Bill...will do this weekend and get back with the results!

 

So I checked out everything I possibly good. Everything was tight and solid. Boots were not ripped at all. Everything looked fine. Of course made no a single noise while I was under there!