SuperLift 12″ Lift Kit (with 52″ Rear Springs) for Chevy/GMC 1973-1991 3/4 Ton 4WD Solid Axle Vehicles


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SKU: K447 Category: Brand:


SuperLift 12″ Lift Kit (with 52″ Rear Springs) for Chevy/GMC 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 3/4 Ton 4WD Solid Axle Vehicles

Part: K447

  • 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 re springs and a 3″ block kit
  • Raised steering arm, raised steering block and drop drag link included
  • Sway bar drop brackets included
  • Front driveshaft spacer available
  • Superlift Superide shock absorbers included
  • Lifetime Warranty
  • Satisfaction Guarantee

Tire & Wheel Info

40 x 15.50 tire on standard offset wheel

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 Notes

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

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.

Installation Instructions

Product Overview

The 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 Superide 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 Superide shocks.

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

Fitment Table

1973-1987 Chevy/GMC 3/4-ton Pickup 4WD
1973-1991 Chevy/GMC 3/4-ton Suburban 4WD


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Questions and answers of the customers

  1. Answered by the admin Unfortunately we have no suspension lift kits for 1978 F-250. If you have front and rear leaf spring suspension we'd suggest using the highest blocks you are able to find and body lift kit.

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