If you are getting an aftermarket upper CA will it effect the pinion angle and cause vibration with an aluminum drive shaft? I have heard you need to get the adjustable to prevent this. Is this true?

 

If it is exact the same length as stock, and you have no plans of changing the ride height, then no. I would recommend getting the adjustable anyway and setting it with an inclinometer, preferably digital. It should be between 3.5 and 4%. I set mine to 3.8% and it is perfect.

 

TY