Spring - F-250/F-350: Installation

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Tighten the fasteners with the suspension loaded or with the weight of the vehicle resting on the wheels and tires, otherwise incorrect clamp load and bushing damage may occur.

NOTE: Only tighten the nut and bolt finger tight at this stage.

If necessary. Position the rear spring shackle onto the spring and install the new spring-to-shackle nut and bolt.

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If equipped. Make sure that the spring spacer is properly positioned with the arrow facing towards the front of the vehicle.

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Position the rear spring assembly.

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NOTE: Only tighten the nut and bolt finger tight at this stage.

Install the new spring shackle-to-frame bolt and flagnut.

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NOTE: The LH spring-to-frame bolt must be installed with the bolt head facing the fuel tank.

NOTE: Only tighten the nut and bolt finger tight at this stage.

Install the new spring-to-frame nut and bolt.

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1. NOTE: Verify U-bolts are perpendicular and on center to leaf spring. Maintain equal side-to-side clearance to leaf spring stack when securing.
  
  Install the new U-bolts.
2. Install the U-bolt plate.
3. NOTE: Only tighten the nuts finger tight at this stage.
  
  Install the new U-bolt nuts.
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Lower the vehicle until the weight of the vehicle is resting on the wheels and tires (curb height).
Tighten the new spring shackle-to-frame bolt and flagnut.
Torque: 173 lb.ft (235 Nm)

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If necessary. Tighten the new spring-to-shackle nut and bolt.
Torque: 173 lb.ft (235 Nm)

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Tighten the new spring-to-frame nut and bolt.
Torque: 490 lb.ft (665 Nm)

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NOTE: Vehicles equipped with midship fuel tank.

For the LH spring, raise the fuel tank. Refer to: Fuel Tank - Vehicles With: Midship Fuel Tank 6.2L V8 . Refer to: Fuel Tank - Vehicles With: Midship Fuel Tank 6.8L Triton-30V - V10 . Refer to: Fuel Tank - Vehicles With: Midship Fuel Tank 6.7L Power Stroke Diesel .
Tighten the new U-bolt nuts in a cross pattern in 4 stages.
Torque:

SRW Vehicles:

:Stage 1: 48 lb.ft (65 Nm)

Stage 2: 96 lb.ft (130 Nm)

Stage 3: 148 lb.ft (200 Nm)

Stage 4: 195 lb.ft (265 Nm)

DRW Vehicles:

Stage 5: 74 lb.ft (100 Nm)

Stage 6: 148 lb.ft (200 Nm)

Stage 7: 221 lb.ft (300 Nm)

Stage 8: 295 lb.ft (400 Nm)

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Install the wheel and tire. Refer to: Wheel and Tire - Vehicles With: Single Rear Wheels . Refer to: Wheel and Tire - Vehicles With: Dual Rear Wheels .