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Here are a few hints I found:
<<<<Here comes the real leap of faith. Let’s image you are at the driver’s side rear facing the spring plate. If we fix the outer spring plate on the outer end of the torsion bar and then move the torsion bar inner by one spline (in the counter-clockwise direction - moves the spring plate up and lowers the car), we will have changed the position of the spring plate (relative to the ground) by 9 degrees. Now if we fix the inner splines and now relocate the spring plate (in the opposite direction, clockwise - moves the spring plate down raising the car) we will be essentialy removing 8 degrees 10 minutes from the 9 degrees we advanced on the inner splines, thus resulting in a net 50 minute change in the spring plate position. Think about it, and reread this paragraph until you get it. Due to the 4-spline difference between the inner and outer splines of the torsion bar, adding then subracting these relative angles allow us to adjust the ride height to within fractions of an inch.
If you understand the meaning of the preceeding paragraph you are ready to index your own torsion bars. If you’re lost or confused at this point, get help. Your next question will probably be "But how much do I raise or lower the spring plate in order to get the ride height I’m looking for?" If you are not changing the torsion bars and you are starting from the factory torsion bar position (you did take notes when you took it apart didn’t you?), you can ‘estimate’ the ride height change (approx 6.5mm for a 50 minute change) by using basic priciples of geometry a the rules of the great queen SOH-CAH-TOA. If you are replacing the torsion bars with ones of different rates or did not note the location of the spring plate (dumb-dumb) before removing the torsion bar, the answer to this question, I’m sad to say is: "Trial and error my friend, trial and error." When I bought my new torsion bars, and dared ask this ‘stupid’ question, the customer service rep at Automotion gave me that answer. I thought he was nuts! He also told me it would probably take three tries to get right. I whimpered then cried. My better half Kristine smacked on the head and snapped me back to reality. "Thanks Kris, I needed that."
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