Reply to "ZF safety wire kit while the tranny is in the car"

bosswrenchMember

OEM ring gear bolts are serrated on the backs. The serrations are designed to dig into a surface to lock the bolt. But ring gear backsides are far too hard to allow the bolts to dig in, so the OEMs only offer reduced contact surface due to the serrations- which is not optimum. In addition, OEM ZF bolts seem to be over-hardened for the job, which makes them brittle. In this application, we want bolts that are more tough than hard, to handle impact loads. SAE Gr-5 (equiv. Euro gr-8.8) seem to work best. Finally, using 12-point super-bolts causes you to spend much time trying to find a crows-foot socket to fit them since room to torque bolts inside the cases is very limited. I suspect a 12-point user would have to make his own wrench. Lots of trouble for a questionable improvement- even pro-racers somehow got along without them.

2/16/0912:49 PM

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