Z4 Differential Cover Install (Not DIY)
I just replaced my the differential cover with a cover from a Z4 while I installed a Quaife LSD. This is not a DIY for the procedure. However, I did want to point out two items that are required for a proper install that I didn't know about when I ordered my cover.
The Z4 cover is a direct bolt on for non-M3 E46 differentials. However, you need to purchase two additional items: 1)Loctite 5970 Gasket Maker, and 2)one 60mm diff bolt (M10X60-8.8-ZNS up to 9/03 build or M10X60-10.9ZNS3 from 9/03)
You won't find diff gaskets any more; BMW uses the loctite in lieu of a gasket. The loctite is difficult to find outside of BMW dealerships, but it is out there. BMW charges about $45 a tube. Off the shelf products will not resist gear oil the way the loctite product does; the diff will leak after awhile.
Although you can reuse the bolts from your old diff, the Z4 cover requires one bolt that is longer than the others.
2004 330i ZHP ESS TS2