GM Astro/Safari 1985-1996 Repair Guide

Wheel Lug Studs

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REMOVAL & INSTALLATION



Front Wheels on 2wd Vehicles

See Figure 1

  1. Raise and support the front of the vehicle safely using jackstands, then remove the wheel.
  2.  
  3. Remove the brake pads and caliper. Support the caliper aside using wire or a coat hanger. For details, please refer to Brakes of this guide.
  4.  
  5. Remove the outer wheel bearing and lift the rotor off the axle. For details on wheel bearing removal, installation and adjustment, please refer to General Information & Maintenance of this guide.
  6.  
  7. Properly support the rotor using press bars, then drive the stud out using an arbor press.
  8.  

If a press is not available, CAREFULLY drive the old stud out using a blunt drift. MAKE SURE the disc is properly and evenly supported or it may be damaged.

To install:
  1. Clean the stud hole with a wire brush and start the new stud with a hammer and drift pin. Do not use any lubricant or thread sealer.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Use an arbor press to drive the old stud from the rotor-front wheel of 2wd vehicles

  1. Finish installing the stud with the press.
  2.  

If a press is not available, start the lug stud through the bore in the hub, then position about 4 flat washers over the stud and thread the lug nut. Hold the disc, while tightening the lug nut and the stud should be drawn into position. MAKE SURE THE STUD IS FULLY SEATED, then remove the lug nut and washers.

  1. Install the rotor and adjust the wheel bearings.
  2.  
  3. Install the brake caliper and pads.
  4.  
  5. Install the wheel, then remove the jackstands and carefully lower the vehicle.
  6.  

Rear Wheels and Front Wheels on 4wd Vehicles

See Figure 2

  1. Raise and support the vehicle safely using jackstands, then remove the wheel.
  2.  
  3. On front wheels, remove the brake caliper and rotor. Support the caliper from the suspension using wire or a coat hanger. For details, please refer to Brakes of this guide.
  4.  
  5. On rear wheels, remove the brake drum.
  6.  

When replacing the front hub bolts on vehicles with 4 wheel anti-lock brakes, remove and replace only 1 wheel lug stud at a time to avoid misaligning the speed sensor exciter ring.

  1. DO NOT hammer the wheel stud to remove it. This will ruin the wheel bearing. Use the stud press tool such as J-6627A or equivalent to press the stud out of the hub. If sufficient clearance is not available with the hub or shaft installed, the components must be removed.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: On many vehicles a stud press tool may be used with the hub still installed on the vehicle

To install:
  1. Clean the hole with a wire brush and start the new stud into the hole. Do not use any lubricant or thread sealer.
  2.  
  3. Stack 4 or 5 washers onto the stud and then put the nut on. Tighten the nut to draw the stud into place. It should be easy to feel when the stud is seated.
  4.  
  5. Install the rotor and caliper or drum, as applicable.
  6.  
  7. Install the wheel, then remove the jackstands and carefully lower the vehicle.
  8.  

 
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