The half shaft on my Z turn about an inch before the wheels start turning. I'm sure this is the reason for the "thunk" sound I hear when I let out the clutch. Any ideas on what the cause is, u-joints etc..? Ideas would be appreciated. Thanks

Climb back up under the car and twist the half shaft watching for where the play is located. If it's a U-joint you will see the play in that location and then know that this is what you have to replace. If your u-joints are tight and the play is at either end of the half shaft then repost with your findings and someone here who knows more than I do will be able to assist you further.

Well I got under the car and sure enough the outer passanger side u-joint is bad. Thanks for looking at my post

to be a real Zed freak, you are going to have to get good at replacing all 4 u joints on those halfshafts.

I have had to do it twice; the passenger outer u joint seems to always go first (the wheel that drives the most)...the needles all fall out...recommend splicer u joints (seem to work best)...first time you do this, the whole operation takes about 3 hours...the 2nd time, 1/2 the time (about an hour and a half)...you get real good at replacing the u joints!

Good luck, and after replacing all 4, the drive gets a lot tighter...if the rubber mount on the diff hasn't been replaced for a long time, it more than likely needs replacing as well and is causing a little of the bump (but the ujoint will really make the clunk sound!)....

Also check the moustache bar bushings. If they are broken up, or missing, it will also contribute to the 'thunk'.