12in Chevy/GMC Lift Kit | Rear Spring Kit

12in Chevy/GMC Lift Kit | Rear Spring Kit

Starting At*: $1,399
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  • This is a complete Superlift leaf spring suspension lift kit for the 1973-1991 Chevy/GMC 1/2 ton pickup 4WD
  • Provides 12” lift height
  • Includes rear Superlift leaf springs and blocks, front and rear Superlift shocks
What does it include?
  • Front and rear leaf springs, shocks, raised steering arm, adjustable drag link, raised 3-bolt steering block, rear block and u-bolt kit, and all hardware required specific to the 1973-1991 4WD Chevrolet/GMC ½ Ton Solid Axle Vehicles.
  • Detailed instruction manual walking you step-by-step through the lift kit installation procedures suitable for do-it-yourselfers (DIY) or professional installation
  • Heavy Duty Front leaf springs
  • Durable Urethane spring eye bushings
  • Degree shim installed on the front springs to help driveline angle
  • Rear lift options include full replacement rear springs and a 3" block kit
  • Raised steering arm, raised steering block and drop drag link included
  • Sway bar drop brackets included
  • Rear brake hose included
  • Superlift shock absorbers included

This 12" lift system consists of Heavy Duty (HD) front leaf springs, durable Poly spring bushings, replacement front U-bolts, front sway bar brackets, a front driveshaft spacer, brake hose relocation brackets, rear brake hose, replacement rear leaf springs with Poly bushings, and a 3" block and u-bolt kit for the rear. For steering correction, a 4" raised steering arm, a 4" adjustable drag link, and a 3" raised steering block are also included. The kit is packaged complete with Superlift shocks.

Options include single and dual steering stabilizers, and a 4" rear shackle flip kit.

NOTE: If the vehicle is factory-equipped with auxiliary (dual) front shocks also order quantity two, part number 85150 shocks.

NOTE: 88-91 Suburban models require additional part number 315-88 bushing sleeve kit.

Tire Wheel  Backspacing Offset
38 x 14.5 3.75 - 4 -
40 x 15.5  3.75 - 4  -


IMPORTANT DISCLAIMER: The provided tire/wheel fitments are approximate. Actual dimensions of a given tire size can vary considerably from one brand to another. Manufacturers' wheel offset and backspacing measurement points are not always consistent. Backspacing greatly impacts tire-to-fender clearance when turning. Wheel width and backspacing influence whether the tires protrude past the fenders, and to what extent. Considering these important factors, we recommend that you fit-check your tire/wheel selection prior to purchasing.

  • Installation time: 4 hours
  • Difficulty level: 3 of 5

Additional Info

1977.5-91 models require clearance (machining) of the front driveshaft CV cluster to prevent binding. If the vehicle has a single exhaust, the cross-over pipe requires modification to clear front driveshaft. Front driveshaft MUST be lengthened.

Optional extended length brake hoses recommended.

Rear brake hose included in kit box.

Brake line/hose relocating hardware included in kit box.

This is a SwampRunner Series lift system that is intended primarily for off-road or exhibition use. Reference the "Important Product Use" section of the Warranty for additional safety-related information.

NOTE: If the vehicle is factory-equipped with auxiliary (dual) front shocks also order quantity two, part number 85150 Superide shocks.

NOTE: 88-91 Suburban models require additional part number 315-88 bushing sleeve kit.

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