(4) To adjust left wheel caster on 4X2 models, turn
the upper, inner control arm bushing adjustment nuts (figure
The front adjustment nut controls negative
caster; the rear adjustment nut controls positive caster. If
you adjust one wheel, always adjust the other as well.
(5) Check and adjust the right wheel in the same man-
ner, but start by turning the front wheels to the left.
The truck will tend to pull toward the side
with the least positive (or most negative)
caster. Most highways are designed with
the center higher than the sides, so if you
can't set both wheels exactly equal, put
the least positive caster on the left wheel.
sure caster and camber are correct before you adjust toe-in.
Make the adjustment as follows:
Figure 7-18. Positive Caster Angle.
Figure 7-20. Front Wheel Toe-In.
(1) Turn the front wheels to the exact straight-
(2) Roll the truck ahead one full revolution of the
wheels, with the full weight of the truck on the wheels.
(3) Using a toe-in gage (bar), check the distance be-
tween the inside edges of the front tires at hub height. Note
(4) With the bar still in place, roll the truck ahead
until the two measurement points are in the rear at the
same (hub) height.
(5) Check the distance between the tires and note the
reading. Toe-in is the amount that the second (rear) reading
is greater than the first (front) reading. Acceptable toe-in
Figure 7-19 is deleted.