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When I shift while accelerating in my 72, the rear of the car lets out a "CLUNK" of disapproval. Does the rear-end need to be replaced, or maybe just tightened down better?
 

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There is a bushing under the read diff that needs to be replaced. I've never done it so I don't know much about it. It's a start anyway.
 

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I agree, it's a commom problem. The rear differential mount has gone. It's probably old as your car and needs to be replaced. It's made out of rubber. It's not that hard to replace. United Z Club L.A./LB. Sy.

good luck Kid.
 

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Mine is doing the same thing. I think mine is the mustache bushings. I read somewhere that you can slide a floor jack under the diff. and jack it up. If the diff moves at all before the car does it is definately the mount. Don't know if that's a true test or not.
 

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I also had a clunk from what I thought was the rear between shifts, but AL260Z suggested the ujoints on the driveshaft....I thought NOOOOOOOOOO, it's coming from the rear. Well, it wasn't...check the ujoints....that's all it was with mine. 78Z
chris
 

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This is a very common problem that is extensively discussed in the archives of this forum. Do a search on CLUNK and you will find a lot of information about it.

There are more than one factor that can contribute to this condition. For a great essay on the subject, see the Datsun Z Car Garage web site -- address is in the links portion of Zcar.com
 

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One thing you might check on the "Clunk" which helped me isolate my problem on the 71. That is does it clunk when backing up and does it clunk when starting out. My clunk was a badly worn U joint on the right half shaft. Good luck!!
 
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