SuperLift 12″ Lift Kit (with 52″ Rear Springs) for Chevy/GMC 1973-1991 K20 4WD Solid Axle Vehicles

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 K20 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

• 45367-3008.pdf

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