F 550 2WD Super Duty V10-6.8L (2009)
2. Using a suitable jack, support the rear axle.
3. Remove and discard the U-bolt nuts, then remove the spring plate.
4. Remove and discard the U-bolts.
5. Remove and discard the spring-to-front bracket bolt and flagnut.
6. Remove and discard the shackle-to-rear bracket bolt and flagnut.
7. Remove the rear spring assembly.
8. Remove and discard the spring-to-shackle nut and bolt and remove the rear spring shackle.
9. If necessary, remove the auxiliary spring.
1. Remove the auxiliary spring nut.
2. Remove the upper spring plate.
3. Remove the auxiliary spring.
4. Remove the auxiliary spring spacer.
Installation
1. If removed, install the auxiliary spring in the following sequence.
1. Position the auxiliary spring spacer.
2. Position the auxiliary spring.
3. Position the upper spring plate.
4. Install the new auxiliary spring nut and tighten to 100 Nm (75 lb-ft).
2. NOTICE: Final tightening of the spring-to-shackle nut must be done with the suspension at curb height or damage to the bushing may
occur.
Position the rear spring shackle onto the spring and install the new spring-to-shackle nut and bolt until snug.
3. NOTICE: Final tightening of the shackle-to-rear bracket bolt must be done with the suspension at curb height or damage to the bushing
may occur.
Position the rear spring assembly and install the new shackle-to-rear bracket bolt and flagnut until snug.
4. NOTICE: Final tightening of the spring-to-front bracket bolt must be done with the suspension at curb height or damage to the bushing
may occur.
Install the new spring-to-front bracket bolt and flagnut until snug.
5. NOTICE: Final tightening of the U-bolt nuts must be done with the suspension at curb height or incorrect clamp load may occur.
Install the new U-bolts, springs plate and U-bolt nuts. Align the U-bolts so they are as vertical as possible and tighten the nuts until snug.
6. With the suspension at curb height, tighten the new spring-to-shackle nut to 225 Nm (166 lb-ft).
