Hey fellas, I get a clunk noise when i put the car in reverse and ease on the throttle to move. Doesn't clunk again when i put it back in drive though. So that doesn't sound like the u-joint to me? Only when you put it in reverse and press the gas. Car drives and shifts fine. Noise is coming from the rear. Maybe low diff fluid? I've heard about jag differentials. Hopefully minor. Hopefully u-joint.

 

To clarify, it's not until you apply a little throttle in reverse that you hear the noise? No clunk until throttle is applied?

Yes, hopefully a u-joint but I'd be worried about a differential problem.

Check the trans mounts while you're under there just on GP

Cheers
DD

 

yes, no noise until throttle applied. doesn't the u-joint clunk again when you go back to drive? if i could get it on a lift and put it in neutral and rock the driveshaft back and forth, i may find the culprit

 

I get it too. I have alot of play in the half shafts. Do you ever get in from a stop and making a turn?

 

A u-joint that is worn enough to clunk should be very easy to spot...as it'll be on it's last legs and about ready to self-destruct.

There is free play, by design, at the transmission output shaft and free play at the differential pinion. With wear, the stack-up of play in these two areas can cause a clunk usually heard when you shift in/out of P-R-D...as that's when the free play is taken up. In this case, since the clunk is heard only when throttle is applied, I'm leaning towards a diff problem.

I wonder, though, if it's actually a suspension component? Worth checking, as the fix would almost certainly less hateful than an internal differential problem.

Cheers
DD

 

Check the jurid couplings, theyre the big black rubber couplers at the front and rear of the drive shaft. If theyre distorted or very cracked they need to be replaced. If thats the issue i do have 2 like new ones pm me

 

Could be u-joints, or internal differential parts (bearings,etc.) as posted above. Could also be a loose pinion nut! When I got my XJR, the previous owner had the differential input seal replaced and the shop a) re-used the old pinion nut (bad), and b) did not stake it in place (very bad). Have a qualified !!! shop make sure that that is not the problem.

 

thanks guys