GM Service Manual Online
For 1990-2009 cars only

Drive Type/Model

Service Allowed

Service Preferred

Z Trim Height

RWD

66 to 90 mm (2.6 to 3.54 in)

78 mm (3.07 in)

A4WD

85 to 109  mm (3.35 to 4.29 in)

97 mm (3.82 in)

D Trim Height

Air Suspension

131.4 to 139.4 mm (5.17 to 5.49 in)

135.4 mm (5.33 in)

Except Air Suspension

149.4 to 161.4 mm (5.88 to 6.35 in)

155.4 mm (6.12 in)