GMC 1986 P-Truck Service Manual page 180

A minus B .. .Camber (Inches)
C . .Camber (Degrees Positive)
D . . .Caster (Degrees Positive)
E minus F .........Toe-In (Inches)
INSPECTION
Before making any adjustments affecting caster,
camber or toe-in, the following front end inspection
should be made:
Inspect
1. Tires for proper inflation pressure. Refer to
WHEELS AND TIRES (SEC. 3E).
2. Front wheel bearing for proper adjustment. Refer
to FRONT SUSPENSION (SEC. 3C.).
3. Ball joints, tie rod ends, and relay rods. If exces­
sive looseness is noted, correct before adjusting.
Refer to STEERING LINKAGE (SEC. 3B1).
4. Wheels and tires for run-out. Refer to WHEELS
AND TIRES (SEC. 3E).
5. Dimension " BC" in (figure 3). If not within specifi­
cations, the correction must be made before ad­
justing caster.
6. Steering gear for looseness at the frame.
7. Shock absorbers for leaks or any noticeable
noise. Refer to FRONT SUSPENSION (SEC. 3C).
ON-VEHICLE SERVICE
Front View
Figure 1—Caster - Camber - Toe-In
FRONT END ALIGNMENT 3A-3
Side View
8. Control arms or stabilizer bar attachments for
looseness. Refer to FRONT SUSPENSION (SEC.
3C).
9. Alignment equipment. Follow the manufacturer's
instructions.
10. Level of the vehicle. The vehicle must be on a
level surface fore and aft and transversely.
FRONT END ALIGNMENT
REQUIREMENTS
Satisfactory vehicle operation may occur over a wide
range of front end alignment settings. If the settings
vary beyond certain tolerances, adjustments are
advisable. The " Specifications" at the back of this
section is a guideline for vehicle diagnosis or for
repairs.
Set the front end alignment to specifications while
the vehicle is in its no rm a lly loaded condition.
Vehicles which are consistently operated with heavy
loads should have toe-in adjusted with the vehicle
under heavy load. This procedure should result in
longer tire life.
B-07371