Differential Drive Flange (Left Or Right): Installation
WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
Install retaining ring. See Fig 1. Press in drive flange further until retaining ring snaps in place audibly. Insert drive flange and rotate until spline on flange meshes with teeth on differential bevel gear. Coat drive flange at contact face of shaft seal with rear differential oil. Clean shaft seal race on drive flange thoroughly. If the retaining ring was installed in rear differential, twist retaining ring until both ends settle into the groove.