Rear drive stiffness / binding

[jimmyC86]

Thanks Rob I will try that. Yes the pinion rotates freely and smoothly without the ring gear...and with the ring gear as well. Just when torque applied it all binds

By full rebuild I have done the following: complete disassembly and thorough cleaning of all parts; had main drive case powder coated; all new oil seals; new pinion needle bearing; everything reassembled.
I did not replace the ring gear needle bearing that sits in the case....possible that the pressure is causing that to bind?

Thinking back I don’t recall checking the rotation before I stripped it apart. Since I was rebuilding I just jumped right in so there is a chance it was an existing issue and not something new occurring. Needless to say, it needs addressing!

[Rob Frankham]

Sorry to come back to this but it really does need the axial play and backlash checked ...

Rob

[jimmyC86]

10-4. I’ll be flipping a coin on investing in the tools or shipping to Max BMW for pro service. Likely the latter

[ME 109]

It's possible the crown wheel needle roller has slipped out a little while the fd was in the oven. There goes your clearance.
The crown wheel needle roller will almost fall out at 100C.