Wheel Alignment Specifications & Adjustment Procedures: Other GMC Envoy I

RIDE HEIGHT

Note. Proper ride height is necessary for correct wheel alignment. Before measuring ride height, ensure tire inflation pressure is correct, cargo compartment is empty, and fuel tank is full (at least half full on Tracker). Envoy uses Automatic Level Control (ALC) system. If suspension height is not as specified, check ALC system.

Except "C " (1999 Rear), "G", "P" & "U" Series, & Tracker

Bounce vehicle several times to normalize suspension. Measure ride height ("Z"). (Scheme 1), (Scheme 6), (Scheme 7) and (Scheme 9). If ride height is not as specified, repair or replace suspension components as necessary. See RIDE HEIGHT SPECIFICATIONS table. If ride height is okay, align wheels. See WHEEL ALIGNMENT PROCEDURES.

1999 Sierra & Silverado C1500 & C2500 (Rear)

1. Ensure vehicle is completely unloaded. Using hands, lift rear bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure ride height ("D"). (Scheme 2) Repeat this procedure 2 more times. Note measurements.
2. Push rear bumper down 1.5" (38 mm), then let vehicle rise. Do this 2 more times. Measure ride height ("D") 2-3 times using this procedure. To obtain ride height, average the high and low measurements of steps 1) and 2). If ride height is not as specified, repair or replace suspension components as necessary. See «RIDE HEIGHT SPECIFICATIONS»(ref-1221-S05263822712000031300000) table. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000)

"L" & "M" Series (Rear)

1. Using hands, lift rear bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure ride height. (Scheme 3)
2. Repeat step 1 2 more times. To obtain ride height, average the high and low measurements. If ride height is not as specified, repair or replace suspension components as necessary. See «RIDE HEIGHT SPECIFICATIONS»(ref-1221-S05263822712000031300000) table. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000).

"G" Series (Front)

1. Using hands, lift front bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure ride height ("Z"). (Scheme 1)
2. Push front bumper down about 1.5" (38 mm). Gently remove hands and allow vehicle to rise on its own. Do this 2 more times. Measure ride height. (Scheme 1) To obtain ride height, average high and low measurements.
3. If ride height is not as specified, repair or replace suspension components as necessary. See «RIDE HEIGHT SPECIFICATIONS»(ref-1221-S05263822712000031300000) table. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000).

"G" Series (Rear)

1. Lift front bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure ride height ("D") on right side of vehicle. (Scheme 4)and (Scheme 5).
2. Push front bumper down about 1.5" (38 mm). Gently remove hands and allow vehicle to rise on its own. Do this 2 more times. Measure ride height on right side of vehicle again. Average measurements.
3. Repeat steps 1 and 2 on left side of vehicle. Compare right and left side measurements. Rear trim height should not exceed 0.5" (13 mm) from side-to-side (left to right). If ride height is not as specified, repair or replace suspension components as necessary. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000).

"P" Series

Information is not available.

Tracker (1998 Front)

Bounce vehicle several times to stabilize the suspension. Measure trim height "Z". (Scheme 8) Do this 2-3 times and average measurements. If ride height is not as specified, repair or replace suspension components as necessary. If ride height is okay, align wheels. See WHEEL ALIGNMENT PROCEDURES.

Tracker (1998 Rear)

Bounce vehicle several times to stabilize the suspension. Measure trim height "D". (Scheme 8) Do this 2-3 times and average measurements. If ride height is not as specified, repair or replace suspension components as necessary. If ride height is okay, align wheels. See WHEEL ALIGNMENT PROCEDURES.

"U" Series (Front)

1. Lift front bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure and record dimensions "Z" and "J". (Scheme 10)
2. Push front bumper down about 1.5" (38 mm). Gently remove hands and allow vehicle to rise on its own. Do this 2 more times. Measure and record dimensions "Z" and "J" again. To obtain ride height, average the high and low measurements.
3. If ride height is not as specified, repair or replace suspension components as necessary. See «RIDE HEIGHT SPECIFICATIONS»(ref-1221-S05263822712000031300000) table. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000).

"U" Series (Rear)

1. Lift front bumper about 1.5" (38 mm). Gently remove hands and allow vehicle to settle on its own. Do this 2 more times. Measure and record dimensions "D" and "K". (Scheme 10)
2. Push front bumper down about 1.5" (38 mm). Gently remove hands and allow vehicle to rise on its own. Do this 2 more times. Measure and record dimensions "D" and "K" again. (Scheme 10) To obtain ride height, average the high and low measurements.
3. If ride height is not as specified, repair or replace suspension components as necessary. See «RIDE HEIGHT SPECIFICATIONS»(ref-1221-S05263822712000031300000) table. If ride height is okay, align wheels. See «WHEEL ALIGNMENT PROCEDURES»(ref-1221-S31547356382000031300000).

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

RIDE HEIGHT SPECIFICATIONS

JACKING & HOISTING

Put floor jack or vehicle hoist under vehicle at proper lifting points. (Scheme 11)- (Scheme 17). If raising vehicle on a twin post hoist, do not damage suspension components, rear axle cover, or steering linkage.

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

"C", "G", "K" & "P" (Frame Angle)

1. Position vehicle on smooth, level surface. Using inclinometer or bubble protractor, measure frame angle. Determine if frame angle is up-in-rear or down-in-rear.
2. To determine corrected caster reading with various frame angles and caster readings apply one of the following rules: Down-in-rear frame angle must be subtracted from a positive caster reading. Up-in-rear frame angle must be added to a positive caster reading. Down-in-rear frame angle must be added to a negative caster reading. Up-in-rear frame angle must be subtracted from a negative caster reading.

If corrected caster is not within specification, adjust caster to specified setting.

"L", "P" & "S" Series (Caster & Camber)

On "P" series, check frame angle. See "C", "G", "K" & "P" (FRAME ANGLE). On all models, loosen nuts securing upper control arm shaft to frame. (Scheme 21) Remove original shims from bolts, and add or remove shims until caster and camber are within specification. See WHEEL ALIGNMENT SPECIFICATIONS table. Tighten nuts to specification. See TORQUE SPECIFICATIONS table.

"M" & "T" Series (Caster & Camber)

Loosen nut on end of each bolt securing upper control arm to frame brackets. (Scheme 22) Rotate bolts until camber and caster are within specification. See WHEEL ALIGNMENT SPECIFICATIONS table. Tighten nuts to specification. See TORQUE SPECIFICATIONS table.

Tracker (Caster & Camber)

Caster and camber is not adjustable. Measure caster and camber to check for bent or damaged parts. See WHEEL ALIGNMENT SPECIFICATIONS table. Replace damaged components if necessary.

"U" Series (Caster)

Caster is not adjustable. Measure caster to check for bent or damaged parts. See WHEEL ALIGNMENT SPECIFICATIONS table. Replace damaged components if necessary.

"U" Series (Camber)

1. Raise and support vehicle. Remove rear wheel. Remove strut. Put strut in a vise. File bolt hole at lower end of strut to make it oblong. (Scheme 23)
2. Install strut, but DO NOT fully tighten strut mounting bolts at steering knuckle. Lower vehicle. Adjust camber to specification. See «WHEEL ALIGNMENT SPECIFICATIONS»(ref-1221-S15987742802000031300000) table. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(ref-1221-S22928333602000031300000) table.

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23