Gday guys, i just recentley was given a diff (thanks to the member!) and i thought that this would eliminate the noise that is coming from the rear of my car - wrong.

The noise is a loud clunking coming from the rear on de-acceleration. ie when not stepping on the gas like pulling up to the lights or going down a hill. It only happens at rev's under about 3800RPM otherwise the noise is not there.
And when im coasting the noise isnt there either, it happens in everygear.
I took it to a shop (driveline specialist) and he took it for a drive with me and he said yes it most probably is the diff but he said leave it with me for about an hour and ill have a look also. (and no i didnt get ripped off but yes he looked at it some more just to be sure for free - top bloke!)

The diff is a H150 unit but i am using a 56a box and the tailshaft that came with the car (60a box so 60a shaft).

In my service manual it says it could be excessive backlash but it cant be that as ive tried another rear end.
Im most likley guessin its my uni joints and they have excessive slop in them, you guys reckon im on the right track by saying this?
And u-joints cant be replaced yeah, so im going to have to find another tailshaft.

Cheers
Dave

This thread is also about the same thing
But there was no real remedy or statement by the author if he fixed it