My book covers 700/900s 1982 to 960s. All 7 and 9 caster spec is 5.5 +/- 1 deg. Turbo only 700/900 with factory installed 16" wheels is 4.5 +/- 1 deg and I don't know why. Nothing should affect caster that I know of except damage to the car, which my son had. It was someone that did a test drive before he bought it that did a minor hood damage destroyed the right front tire. Car was reduced in price with a new wheel and tire installed.

The person I have been going to for 20 years is a 240 owner. My son's 95 944T had to get a strut arm to correct the caster angle. Cost was about $100 for the arm about 8 years ago.

Standard length is 15.37", short is 15.16" and lessens the angle by .8 deg, long is 15.59" and increases caster angle by .8 deg.

If the top strut bearing is turned around the wrong way the caster will increase caster +3 deg.

I have had as many bad alignments on my American Ford and GM cars as good ones. I would not trust your alignment shop's readings. Any Volvo indies nearby?

Tom