Quote:
Originally Posted by Westersund
Usually you don't have to change the pinion shim, you can adjust the backlash and gear pattern with the side shims only. Just did my rear axle in the E46 M3 (RSX ramp/clutch style diff and BMW Motorsport 4.45 gearing) because the previous owner is a twat, 3 crown wheel bolts was lost and 2 more was coming undone. Pre-load in the pinion bearings was set to 1 Nm and 0,8 Nm in the side bearings, BMW recommend ridiculously high 2,5 Nm in the pinion bearings and about 2 Nm in the side bearings. Backlash was measured in 3 different places on the crown wheel and turned out to 0,05, 0,08 and 0,14 mm, the BMW recommended backlash is 0,05-0,08 but that couldn't be done in my case (rather have a little more backlash rather than less to have sufficient room for lubrication).
Most importantly, don't forget to use Loctite 270 when installing the crown wheel bolts.
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This is internet miss information, that is why people say that 4.1 make more noise, that is because they don't properly verify the depth and think is just a swap. but we are all free to do what we want with our cars. information is out there for people to choose what to do.
unless your pinion is marked with the same number, you need to adjust, and even then, you would be a few tenths off unless you have the BMW pinion depth tool and all possible shims to approximate as close to a mathematical nominal.