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[quote="robspeed"][quote="lach"]Hi All,

After taking Gracie my '75 2002 for a little drive yesterday, while reversing back into the garage, the rear end locked up momentarily.

I was able to put the car back in first and go around the block a couple of times with no problem, but the lock up has me worried.

I do have some rear end noise, mostly thumping while the car is in gear after I take off the gas.

I recently drained the old diff fluid and replaced with Red Line hoping that would help the noise issue.

The previous owner replaced the diff about 2 years ago...did he install another bad one?

What else could cause the rear wheels to lock up like that?

Thanks,

lach[/quote]

TAKE THE DIFF COVER OFF and inspect for loose bolts!!  I had this exact thing happen and it was one of the ring gear bolts loose in the diff case, getting wedged between the ring gear and the bottom of the case.  I discovered the problem when the bolt head punched a hole in the case and drained all the fluid out!  Do this TODAY! ;)[/quote]

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