I ran into an issue with my rear upper adjustable control arms. I adjusted the arms to their smallest size and couldn't get my initial pinion angle even close to 0 degrees. I did put a 12 bolt rear in the car, so I figured that the mounting point was different. I measured the factory upper brackets and they measured 11 1/4". That was about the middle of the adjustment for the adjustable arms. So they were correct for the G-body. The design of the adjustable control arms allowed me to shorten them without being a major operation. I removed 1 1/2" from the threaded tube. I then had to locate a shop with a 1/2" reverse tap. Now the upper control arms will work.
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