Differential Bushings

[Groucho]

BimmerHeads-

I just got my 1999 323i 5-spd sport back from having polyurethane control arm thrust bushings installed (works great). The tech took it for a test drive, noticed some sloppiness in the driveline, and threw it back up on the lift. As my car was up on the lift, he pointed out that the rear differential mount bushing was cracked, which allowed the diff to move around. They agreed with me that it may be under warranty, and I drove it to the dealership back home.

The car has 96k miles on it, but is still covered under the CPO warranty. About 20k miles ago, BMW replaced the guibo (flex coupling) and guide bushing up front under warranty...but now the stealership says that the diff mount bushings are NOT under warranty. Does that make sense? Anyone else have this failure replaced under warranty? If not, are there polyurethane bushings for the diff mount? (It's not a track car).

Thanks!!