my 88 iroc has a problem in the rear axle mounting somewhere. the left rear wheel is 1.3'' closer to the front of the vehicle than the right rear wheel according to a hunter alignment machine. the car wanders a bit. i have replace both trailing arms. nothing underneath looks bent and is connected properly. there are no signs of the vehicle being wrecked either. the problem is still there even after i did a rear end swap from a 83 TA

 

Check your front A-arm bushings also. A-arm on the left could have a badly worn rear ear bushing.

Dean

 

my front set back seems to be ok. if you stand back and concentrate really hard you can see the rear axle isnt sitting right. it was like that even before i swapped axles. although i dont doubt that the uni body may be shifted due to many hard miles