GM Astro/Safari 1985-1996 Repair Guide

Tire and Wheel Assembly



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Wheel lug nut tightening sequence-use a crisscross pattern

  1. Apply the parking brake and block the opposite wheel.
  3. If equipped with an automatic transmission, place the selector lever in P ; with a manual transmission/transaxle, place the shifter in gear.
  5. If equipped, remove the wheel cover or hub cap.
  7. Break loose the lug nuts. If a nut is stuck, never use heat to loosen it or damage to the wheel and bearings may occur. If the nuts are seized, 1 or 2 heavy hammer blows directly on the end of the bolt head usually loosens the rust. Be careful as continued pounding will likely damage the brake drum or rotor.
  9. Raise the vehicle until the tire is clear of the ground. Support the vehicle safely using jackstands.
  11. Remove the lug nuts, then remove the tire and wheel assembly.

To install:
  1. Make sure the wheel and hub mating surfaces, as well as the wheel lug studs, are clean and free of all foreign material. Always remove rust from the wheel mounting surfaces and the brake rotors/drums. Failure to do so may cause the lug nuts to loosen in service.
  3. Position the wheel on the hub or drum and hand-tighten the lug nuts. Make sure the coned ends face inward.
  5. Tighten all the lug nuts, in a crisscross pattern, until they are snug.

Wheel lug nut torque is especially important on disc brake vehicles where the wheel studs are attached to the hub and bearing assembly. Improper tightening could lead to disc warpage on these vehicle.

  1. Remove the jackstands and carefully lower the vehicle. Tighten the lug nuts, in a crisscross pattern. Always use a torque wrench to achieve the proper lug nut torque and to prevent stretching the wheel studs. For 1985-92 vehicles, tighten the lug nuts to 90 ft. lbs. (120 Nm). For 1993-96 vehicles, tighten the nuts to 100 ft. lbs. (140 Nm).
  3. Repeat the torque pattern to assure proper wheel tightening.
  5. If equipped, install the hub cab or wheel cover.


Check the wheels for any damage. They must be replaced if they are bent, dented, heavily rusted, have elongated bolt holes, or have excessive lateral or radial runout. Wheels with excessive runout may cause a high-speed vehicle vibration.

Replacement wheels must be of the same load capacity, diameter, width, offset and mounting configuration as the original wheels. Using the wrong wheels may affect wheel bearing life, ground and tire clearance, or speedometer and odometer calibrations.