The pinion angle was left the same as the original suspension no changes before and after. I rode the car shortly and it feels tight in the rear no changes in the nice ride that the cars always had, but feels tight in the turns which I loved it. The original LCA the bushings were starting to dry out and I did not want take any chances, the UCA were not as bad but if you do the LCA it is logical to do the UCA as well. Great support and customer service from Brennan at Spohn!!