How does one go about adjusting pinion angle on a 2011 GT AUTO WITHOUT having an adjustable Upper Control Arm or WITHOUT relocation brackets? The car is NOT lowered. The reason I ask is that ever since installing an Upper and Lower Control Arm Package I have a definite clunking noise when cruising at 30-45 and let off the gas and ease back on the gas when in traffic. This is a forward and back noise not side to side. It sounds like something is moving forward and back about 1" and is metal to metal. It is also not road noise which was expected with the new UCA/LCAs. My friend and I followed the instructions that speak of having the car's suspension loaded when tightening everything however we do recall needing to push the rear diff forward about an inch in order to get the upper control arm bolts in place. I have spoken to a few great shops that are on the thread here and they have told me to definitely look at resetting the pinion angle however I have not found anything on the net on how to set it...just how to check it. I would prefer to check and set it myself if possible Ideas anyone?