"Clunk in reverse"
#1
"Clunk in reverse"
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.
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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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
#3
#5
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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
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
#6
Join Date: Sep 2008
Location: Damon /Houston, Texas
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#7
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.
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