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PROCEDURE 1. Test drive the vehicle. Use Chassis Ears® to determine if the noise is coming from the upper or lower control arm (or both). a. If the noise is NOT coming from a rear control arm, diagnose and repair/replace the appropriate component(s), as necessary. Do not continue with this bulletin procedure. b. If the noise is coming from a rear control arm, continue with this bulletin procedure. 2. On the side of the vehicle where the noise occurs, determine whether the noise occurs at the upper or the lower control arm. Use the new parts listed in the PARTS INFORMATION section of this bulletin. Refer to Group 34 in the appropriate service manual. U.S. Vehicles: If the noise occurs at the lower control arm, replace the lower control arm outer (pillow ball) bushing. If the noise occurs at the upper control arm, replace the upper control arm assembly. a. Lower Arm Bushing (Outer Pillow Ball Bushing) Replacement Procedure: Use special tools MB990969?01, MB990971?01, and MB990996?01 to drive out and press?fit the bushing. After press?fitting, the space between the edges of the bushing outer sleeve and the lower arm should be 3 mm (0.12 inch). MB990957?01: Lower Arm Bushing Remover and Installer (includes MB990969?01 and MB990971?01) MB990996?01: Lower Arm Bushing Arbor NOTE: These special tools will be available from SPX/OTC in early August. (They will not be Essential Tools.) Canada Vehicles: ? If the noise occurs at the lower control arm, replace the lower control arm assembly. ? If the noise occurs at the upper control arm, replace the upper control arm assembly. 3. Test drive the vehicle to confirm the squeaking noise is eliminated.

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Using a hydraulic press, remove both bushing and sleeve. Clean and lube I.D of control arm, install poly bushings, lube I.D of poly bushings and install supplied sleeve. LOWER LINKS and SPINDLE When pressing out bushings, it is good practice to remove and replace one at a time to maintain good rear alignment. Mark cam eccentrics prior to removal to aid in re-alignment. Use a hydraulic press and a few different tubing sizes to press out bushings from different positions. 1.400”O.D for upper control arm and rear lateral link 1.500”O.D for rear toe link and lateral link. Use a puller tool (pictured below) with a 1-5/16”O.D tubing to press out the spindle to trailing arm bushing. This can be done without removing the rear spindle from car. Lubricate the inside diameter of spindle eye and install poly bushings, lubricate inside diameter of bushing and install supplied sleeve.

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PRE-ALIGNMENT CHECKS Ensure steering wheel is centered and front wheels are in straight-ahead position (to correct, shorten one tie rod adjusting sleeve and lengthen the opposite sleeve in equal amounts). Ensure none of the following conditions exist: Incorrect vehicle ride height (see RIDE HEIGHT ). Incorrect tire pressure, mismatched tires (differing size or type), excessive tire runout, unbalanced tire and wheel assemblies, loose wheel bearings, or loose wheel lug nuts. Loose or worn steering linkage/suspension components, or excessive play in steering gear box. CAMBER & CASTER ADJUSTMENT “C”, “G” & “K” Series Except 1999 Sierra & Silverado C1500 & C2500 (Caster Adjustment) 1. Check frame angle. See “C”, “G”, “K” & “P” (FRAME ANGLE) . If corrected caster is not within specification, remove frame bracket slots. See “C”, “G” & “K” SERIES (FRAME BRACKET SLOT REMOVAL) . Reset caster by loosening nut on end of each cam bolt securing upper control arm to frame brackets. See Fig. 18 . 2. Rotate cam bolts until caster is within specification. See WHEEL ALIGNMENT SPECIFICATIONS table. Tighten nuts to specification. See TORQUE SPECIFICATIONS table.

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1. Remove the sway bar by removing the four inner sway bar bolts and sway bar link on each side of the vehicle (Figure 1, Figure 2). 2. In the trunk compartment on one side of the vehicle, remove the plastic cover over the upper strut mounting bolts and upper strut mounting nut (Figure 3). 3. Remove the two upper strut mounting bolts and retain for later use (Figure 4). 4. Remove the outer lower strut mounting bolt and discard (Figure 5). 5. Remove the factory strut from the vehicle (Figure 6). 6. Remove the four bolts from the upper control arm and discard (Figure 7). 7. Place the supplied bushing (E) between the upper control arm and the body of the vehicle. Attach using the supplied bolt (I) and flat washer (G). Note: Attach the bushing, bolt, and flat washer, one bolt at a time. Tighten securely. 8. Remove the inner lower strut mounting bolt from the spindle and discard (Figure 8). 9. Repeat steps 2-8 for the other side of the vehicle.

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NOTE: To ensure a proper repair and proper reimbursement, you must read this entire service bulletin before doing any work. SYMPTOM The customer may complain of uneven or rapid rear tire wear, a roaring noise from the rear, and/or a vibration at highway speeds. PROBABLE CAUSE The combination of the tires and the rear suspension geometry may cause rapid and uneven rear tire wear. Tires in an advanced stage of this diagonal or inner edge wear may cause vibration and/or a bad bearing type noise. (For more details, see TIRE INSPECTION AND QUALIFICATION on page 2). CORRECTIVE ACTION Install a rear upper control arm kit, replace the flange bolts, replace the worn tires (see the Tire Replacement Information chart on this page), and do a four-wheel alignment. TIRE INSPECTION AND QUALIFICATION Diagonal Wear Lines The tire is no longer round. There are high and low spots on the tire, worn in a diagonal pattern across the tread.