Thanks. That did end up being the problem by the way. The axle came out of the differential. That's what I get for buying a new aftermarket axle online for $75. Stupid little lock-ring. I stretched it out a bit hoping it will hold better. I must say. I love this forum and I love my X5 and a pre-owned 4.8 E70 is finally within my budget so I'm going to keep it in the X5 fam.