Wheel Alignment Specifications & Procedures - Except "s" Series GMC Pickup R1500

CASTER ADJUSTMENT - 2WD MODELS ONLY

To decrease positive caster, transfer one or more shims from between rear upper control arm bolt and frame to front bolt and vise versa. (Scheme 1) If a normal shim pack will not bring vehicle within specifications, check for damaged control arms and related parts.

CAMBER ADJUSTMENT - 2WD ONLY

Note. Adding an equal number of shims at both front and rear of cross shaft will decrease positive camber. By adding or subtracting equal amounts of shims, camber may be corrected without affecting caster.

Using alignment machine, note camber. Adjust as necessary. Adjust by adding or subtracting shims from between upper control arm shaft and frame bracket. Adding equal number of shims at both front and rear of cross shaft will decrease positive camber and vice versa. (Scheme 1) If a normal shim pack is insufficient, check control arms and related parts for damage.

Scheme 1

TOE-IN ADJUSTMENT

1. Determine toe-in. Adjust as necessary. Inspect tie rod adjuster sleeve clamp bolts and nuts for rust. If in good condition, loosen nuts and bolts. If excessively rusted, measure nut removal torque after breakaway. If more than 7 ft. lbs. (9 N.m), replace nut(s) and bolt(s).
2. Apply penetrating oil to adjusting sleeves and clamps. Loosen adjusting sleeves. Center steering wheel. Lock in position with steering wheel holder.
3. Turn adjusting sleeves to obtain proper toe-in. Check that the number of threads showing on each end of sleeve are equal (within 3 threads) and that tie rod end housings are at right angles to steering arm.
4. Position clamps with bolt centerlines horizontal (within 60 degrees of each other). Ensure adjuster sleeve slot is not within clamp jaws. With clamps between and clear of dimples, tighten clamp bolts and nuts.
5. Clamp ends may touch when nuts are tightened to specification but gap adjacent to adjuster sleeve must not be less than .0050" (.127 mm). Replace clamp and/or sleeve if not to specification.

REAR WHEEL & AXLE HOUSING ALIGNMENT

1. If rear tire wear indicates that axle housing may be bent, check alignment. Back vehicle squarely onto the alignment machine. Compensate for runout the same as for checking front wheel toe-in. NOTE: Because the vehicle is backed onto alignment machine, the actual toe-out will be read on the scale as toe-in. If tram (scuff) gauge is used to check toe-out, disregard this note.
2. Check that camber reading is between 3 degrees negative to 5 degrees positive. Check that toe-in is between 0.0-.05 degrees (0-1/16"). If not within specification, straighten frame and/or related components as necessary.

Note. Equipment used to straighten frame must allow rechecking of camber and toe-in without removing axle housing from vehicle.

WHEEL ALIGNMENT SPECIFICATIONS

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS