Last resort? Cadillac was absolutely no help at all. Obvious problems with the seals but can't get any parts to replace carrier indefinite backorder. Did the engineering myself! Used a ATS carrier, identical but flanges are different bolt pattern so had to use the ATS axles. If the rears go and lock up you can imagine the disaster at 65 mph! That's criminal! Nobody should have 3 or 4 carriers changed out under 50,000 miles!!!! No more Caddy's for me! I bought for quality. And the parts backorder has nothing to do with supply chain. There are no parts because they were used up in multiple changes of carriers!!!