Reply to "Clunk in rear driveline. Advice needed."

bosswrenchMember

Rob, have you ever taken the cover off the ZF and checked to see if the ring gear bolts are intact and safety-wired? Loose ring gear bolts will allow slop in the drive, eventually shearing off the heads of one or more bolts. If this happens and is ignored or mis-diagnosed and a bolt head gets in the R & P mesh, really bad things can happen to your ZF, which is a large fraction of the cost of the car!

I realize that pulling the cover is a non-trivial exercise. A small-diameter fiber-optic light can make its way inside by various means and show whether all 10 bolt-heads are still intact, and the presence or absence of protective safety wire. Several Panteras in CA have gone home on a trailer when this happens. It's worth checking.

3/12/1411:23 PM

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