GM Service Manual Online
For 1990-2009 cars only

Suspension

Z Height

D Height

Trim Height must be verified and adjusted before aligning the vehicle.

Cross Z-Height (LH Z Height to RH Z Height) = ± 10 mm (0.39 in)

ZM 6 Cross D-Height (LH D-Height to RH D-Height) = ± 4 mm (0.16 in)

With RPO ZM6

110 mm (4.33 in) ±6 mm (0.24 in )

149 mm (5.87 in) ±4 mm (0.16 in )

RPO Z83 without QHJ (20 inch tires)

110 mm (4.33 in) ±6 mm (0.24 in )

149 mm (5.9 in) ±12 mm (0.47 in )

RPO Z83 with QHJ (20 inch tires)

107 mm (4.21 in) ±6 mm (0.24 in )

149 mm (5.9 in) ±12 mm (0.47 in )