Klunk !!!!!!!!!!!

JvKintheUSA

I had this clunk fixed at the dealer. They replaced the rear drive shafts and the clunk was gone. That was 4k miles ago. Now it is doing it again. Happens only when I backup or accelerate from a stop - clearly audible when you are parked in a garage. Sounds like there is play in the driveline. I'm afraid it will get worse over time. When I went to a Z meet in VA in August, several other 370Zs made the same noise, but no one there thought it was a big deal. I found this somewhere online:

Clunk
Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle.

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ChrisSlicks

There is a clutch clunk and then there is the rear-end clunk that you are talking about. The rear-end clunk could be slop in the pinion gear, or axle side shafts. My old Datsun had major slop clunk from the diff, eventually I completely destroyed the rear-end trying to launch it.

Slynky

Remembering the old days when I did a LOT more on cars than I do now, I'd say this sort of thing could be universal joint play. Those were things that had to be replaced sometimes in cars. I'd say the more powerful the engine and the more it is driven in a, hmmmm, spirited mode ( ), the more wear and tear it makes on those joints but I wouldn't expect it to show up till 50,000 or 100,000 miles. Dunno...

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