Chrysler 9.25 ZF Rear Master Bearing Kit, Timken

This is the Motive Gear R9.25RZFMKT master bearing kit for the ZF-built Chrysler 9.25-inch rear axle, the 235 mm ring gear version. It is not the same kit as the older Chrysler/American Axle 9.25, so confirm the axle tag or ring gear size before ordering. The kit includes Timken tapered carrier bearings, Timken front and rear pinion bearings, a pilot bearing where applicable, crush sleeve or preload shim pack, pinion nut, pinion seal, cover gasket or RTV, and marking compound with a brush.

Pinion bearing wear on this axle shows up as a whine at cruise and a clunk as slack builds in the driveline. Any time the ring and pinion come out, or a locker goes in, replacing every bearing at once is the only way to get backlash and preload to hold after the rebuild.

Setup order for the Chrysler 9.25 ZF: drive the new pinion races in, set pinion depth with shims, crush the new sleeve to spec while checking rotating torque with an inch-pound torque wrench, press the carrier bearings on, then set backlash and read the pattern with the marking compound before the cover goes back on.