Lean Adjustments

NOTE: Changing front ride height by adding the service shim also affects caster angles and camber angles. Adding the 4.5 mm (0.18 inch) thick shim may reduce caster by up to 0.40 degrees on the side the shim is added and also increase camber by 0.15 degrees.





FRONT LEAN
1. Measure the left and right front ride heights. Add 12 mm (0.5 inch) to the left side ride height measurement.





2. If the difference between left and right ride heights exceeds 16 mm (5/8 inch) and is less than 20 mm (3/4 inch), measured at the wheel house opening to ground, add one shim to the side of the vehicle that is low.

NOTE: The shim is to be placed under the lower spring seat.

3. If there is a computed side-to-side difference of 20 mm (3/4 inch) or more in the left/right wheel house openings, swap springs from side-to-side.

NOTE: If the lean condition follows the spring (lean now on other side of the vehicle), one or both springs are out of specification. Replace both springs with new ones. If lean condition remains unchanged, something other than a bad spring is the cause and must be diagnosed.

NOTE:
^ A side-to-side lean at the rear of the vehicle can be adjusted by approximately 6 mm (1/4 inch) by installing a shim between the rear spring and axle on the low side of the vehicle.
^ A "low at the rear" vehicle can be raised approximately 6mm (1/4 inch) by installation of one shim on each side.

REAR LEAN
1. Raise the vehicle until the weight is off the rear springs but with the tires still touching the floor.
2. Loosen the spring U-bolts to allow the axle to separate from the spring approximately 13 mm (1/2 inch).





3. Position the shim between the rear spring and axle spacer. Tape may be used to hold the shim in position.
4. Make sure the spring leaves are properly aligned and the spring U-bolts contact the edges of the spring assembly or axle seat.
5. Tighten the spring U-bolt sufficiently and make sure the spring bolt head extends through shim into axle seat hole.





6. Tighten the U-bolt nuts to 88 - 102 Nm (65 - 75 ft. lbs.).





SIDE-TO-SIDE LEAN
Side-to-side vehicle lean should be verified by measuring the fender lip-to-ground dimension before beginning diagnosis and service actions. The following are the normal acceptance limits:
^ Maximum of 16mm (5/8 inch) variance between left and right front wheel lips to ground.
^ Maximum of 20mm (3/4 inch) variance between left and right rear wheel lips to ground.
1. Perform the preinspection steps 1 - 13 first.
2. Measure the height of the right and left fender lip openings, dimensions A and B noting dimensions of each and side-to-side differences.
3. If the differences are greater than 16mm (0.63 inch) between left or right front and/or 20 mm (0.79 inch) between left and right rear, factors other than suspension are the cause.