Installation Procedure

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Install the leaf spring assembly to the vehicle.
Loosely assemble the spring to the front hanger bracket.
Install the front spring hanger bracket bolt.
Install the front spring hanger bracket nut.

Fig 1: Installing Front Spring Bracket Nut And Bolt
Courtesy of GENERAL MOTORS CORP.
Install the rear spring hanger bracket bolt.
Install the rear spring hanger bracket nut.

Fig 2: Installing Rear Spring Bracket Nut And Bolt
Courtesy of GENERAL MOTORS CORP.

Important: Do not reuse the U-bolts.
Install the spring spacer.
Install the U-bolts.
Install the anchor plate.
NOTE: Refer to Fastener Notice on page P-9 in Cautions and Notices.
Install the U-bolt nuts.
Tighten
- For 25 series without rear wheel steering, tighten the U-bolt nuts to 72 N.m (53 lb ft).
- For all 25 series including rear wheel steering, tighten the U-bolts to 150 N.m (110 lb ft).
- Tighten the front hanger bracket nut to 150 N.m (110 lb ft).
- Tighten the rear hanger bracket nut to 95 N.m (70 lb ft).
Install the fuel tank for left side applications. Refer to Fuel Tank Replacement (Single Tank) or Fuel Tank Replacement (Dual Tanks - Front) or Fuel Tank Replacement (Dual Tanks - Rear) in Engine Controls- 4.8L, 5.3L, 6.0L.
Install the trailer hitch, if equipped. Refer to Trailer Hitch Replacement in Frame and Underbody.
Connect the electronic suspension control (ESC) sensors, 25 series utilities, if equipped. Refer to REAR POSITION SENSOR REPLACEMENT--ELECTRONIC SUSPENSION--LEFT (25 SERIES) in Electronic Suspension Control (ESC).
Remove the rear axle support.
Remove the safety stands.
Lower the vehicle.

Fig 3: Installing U-Bolts
Courtesy of GENERAL MOTORS CORP.