I was going in tomorrow to get an entire new exhaust system installed and a suspension package. The suspension package is a Kenny Brown super sub connectors, matrix braces and jacking rails.
I had previously installed some Mac fixed lower control arms and adjustable upper control arms on the rear axle. Initially I adjusted the upper control arms to be the same length as the stock upper control arms. I reinstalled the stock rear springs and tried to make sure that they were positioned exactly the same in terms of location of the start of the coil on top and on bottom. After installing I noticed that my ride height was one inch higher on the driver side so I figured that something was just a little off. This evening I was going to try to readjust the springs by taking the load off of them and twisting them slightly to change the height.
But, before I did that I decided to measure my frame and suspension as I had read about in a magazine. Much to my disappointment I discovered the following. I made four measurements from the front pivot point on the rear of each front lower control arm to the middle of the mounting point in the rear torque boxes. The measurements were as follows:
Drivers side front to DS rear: 73 inches
Passenger side front to PS rear: 72 5/8 inches
DS front to PS rear (diagonal): 80 3/4 inches
PS front to DS rear (diagonal): 80 1/4 inches
Are these numbers too far off or are they ok?

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95 GT Convertible
BBK shorties, X-pipe, Magnaflow CB
CAI, 70mm TB, GT40 intake, 1.7 RR, UD pulleys
SFC/braces/JR, AUC Arms
1966 C Coupe - New restoration project
2004 Chev Silverado 4X4