I lowered my 87 240GL about a year ago while my son drove it in high school. I have known for a while the some rear bushing were bad. After getting a bushing kit and making the tool to replace the rear trailing arm bushing, I took a good look to see which one were bad. The Rear bushing were toast. Replacing those two cleared up most of the vibration in my car but I still need the adjustable torque arms. I'm going to install them but too adjust them I'm going to a shop that can raise the car with the wheel Vs raising with the rear axle or jack points.
Greg

The pinion angle should be equal to the transmission output shaft angle as measured on the Ujoint bearing caps.

Here is a pretty good explanation:
http://www.classicchevy5speed.com/files/Universal_Joint_Alignment_Proc_111606.pdf
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Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 52 year old fat man. ;-)

When I did our 92 245, I set the new adjustable torque rods to the same length as the originals and then shortened them by either one half or one and a half turn (sorry can't recall which). The idea is to minimize the angle between the rear drive shaft and the pinion.

jorrell

ps. hopefully, someone can give you the actual numbers.
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92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!