Quote:
Originally Posted by EODguy
I am 90% positive that they are, with the only difference being the ring and pinion.
Only problems may be case spacing bump on the rear (doubtful but possible) and how will the transfer case gearing react to different gear sets (settings/gears need changed?)
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I would think that the different ring gears will fit in the generic e53 diff carrier, but you’ll need to change the pinion too I think. The pinion tooth count and spacing must match the ring gear tooth count and spacing. Changing the pinion bumps a diff rebuild up by an order of magnitude, in my opinion. New bearings, seals, crush sleeve, etc, etc. and don’t forget the special bearing puller to get your old bearings off.
On the other hand, I decided to leave the pinion in my eBay diff that I used and now have a faint whine at 30 to 35 mph. Good chance it’s the pinion…that I should have rebuilt. We’ll see how the oil looks when I get the x home. If it’s mud and chunk free after a 2000 mile drive, I’ll likely live with the whine for a while.
The front and rear final drive ratios must match obviously, so you’ll need to change them both. Unfortunately the front diff carrier and ring gear are different than the rear. Standard BMW harassment package. The front ring gear has fewer bolts and a smaller diameter from what I can tell.