Caster

Before checking the caster of the front axle for correct angle, be sure the axle is not bent or twisted.
Road test the vehicle, make left and right turns. If the steering wheel returns to the center position unassisted, the caster angle is correct. If steering wheel does not return toward the center position unassisted, an incorrect caster angle is probable.

Fig. 2:

Caster can be adjusted by installing the appropriate size shims.

NOTE: Changing caster angle will also change the front propeller shaft angle. The propeller shaft angle has priority over caster. Refer to Transmission and Drivetrain for additional information.