Rear Suspension

Spring - Super Duty F-450, F-550

Removal

CAUTION: Suspension fasteners are critical parts because they affect performance of vital components and systems and their failure can result in major service expense. Install new parts with the same part number or an equivalent part if installation is necessary. Do not use an installation part of lesser quality or substitute design. Torque values must be used as specified during reassembly to make sure of correct retention of these parts.

1. Raise and support the vehicle.
2. Remove the wheel and tire assembly.






3. Support the rear axle with a suitable jack.






4. Remove the U-bolt retaining nuts and remove the spring plate.






5. Remove the U-bolts.






6. Remove the nut and bolt from the front spring hanger bracket.






7. Remove the lower nut and bolt from the rear spring shackle bracket. Remove the rear spring assembly.
8. On 4x4 vehicles, remove the spacer plate.






9. Remove the nut and bolt from the rear spring shackle assembly and remove the rear spring shackle.






10. Remove the auxiliary spring.
1. Remove the auxiliary spring retaining nut.
2. Remove the upper spring plate.
3. Remove the auxiliary spring.
4. Remove the auxiliary spring spacer.

Installation






















1. Using new fasteners, follow the removal procedure in reverse order.