C 2500 Truck 2WD V8-5.7L VIN R (1997)
Caster
Caster is the tilting of the steering axis either forward or backward from vertical when viewed from the side of the vehicle. A backward tilt is measured in
positive degrees and a forward tilt in negative degrees.
On the short and long arm type suspension, you cannot see a caster angle without a special instrument. However, if you look straight down from the top
of the upper control arm to the ground, the ball joints do not line up (fore and aft) when a caster angle other than 0 degrees is present. With a positive
angle, the lower ball joint center line would be slightly ahead (toward the front of the vehicle) of the upper ball joint center line. Caster is designed into
the front axle assembly on all vehicles, and is intended to be non-adjustable. However, if the caster is measured and found to be out of tolerance, the
caster can be set to proper specifications.
Toe-In
Linear sum toe-in results when the distance between the front wheels is less at the front of the axle than at the rear of the axle.
