QA1 77-90 GM B-Body Level 2 Big Wheel Kit

Complete Bolt-In Suspension for 28-Inch Wheels on 1977-1990 GM B-Body

The QA1 BW02-GMB5 Level 2 Big Wheel Suspension Kit is the complete solution for 1977-1990 GM B-Body vehicles running up to 28-inch wheels. Engineered specifically for Box, Donk, and classic B-Body builds, the QA1 BW02-GMB5 delivers a double-adjustable coilover system front and rear, tubular control arms, adjustable trailing arms, and a full front and rear sway bar package in a single bolt-in kit. All components arrive powder coated and ready to install with all necessary mounting hardware.

Key Features

• Front and rear double-adjustable coilover shock systems for individually tuned compression and rebound
• Tubular upper and lower front control arms with corrected suspension geometry for big wheel applications
• Adjustable lower and upper rear trailing arms to center the axle in the wheel well
• Front and rear sway bars reduce body roll and improve stability under raised ride heights
• Front ride height adjustable up to 2 inches up or down from stock
• Rear ride height adjustable 0.5 inches above stock to 2 inches below stock
• Clearance for up to 28-inch wheels with factory rear end housing
• All parts arrive powder coated with all required hardware
• Complete bolt-in installation, no cutting, grinding, or welding required
• Compatible with factory rear end housings

Fitment

Specifications

What's Included

• Front double-adjustable coilover shock system
• Rear double-adjustable coilover shock system
• Pair of tubular upper front control arms
• Pair of tubular lower front control arms
• Front sway bar kit
• Rear sway bar kit
• Adjustable lower rear trailing arms
• Adjustable upper rear trailing arms
• All required mounting hardware

Frequently Asked Questions

No. The QA1 BW02-GMB5 is a complete bolt-in suspension kit. All components are designed to mount directly to the factory B-Body structure with no cutting, grinding, or welding required. Installation can be performed in a home garage or by a local shop.

Level 1 includes a single-adjustable coilover system and adjustable trailing arms, providing basic ride height adjustment and wheel centering. Level 2 (BW02-GMB5) steps up to double-adjustable coilovers and adds tubular front control arms and front and rear sway bars for improved handling and stability. Level 3 upgrades to QA1 MOD-Series shocks for maximum drag racing and performance applications.

The QA1 BW02-GMB5 provides clearance for up to 28-inch wheels when used with the factory rear end housing. The adjustable trailing arms allow you to properly center the rear axle in the wheel well after ride height adjustments.

Yes. The QA1 BW02-GMB5 is designed to work with the factory GM B-Body rear end housing. No rear end replacement is required.

The kit fits 1977-1990 GM B-Body platforms including the Chevrolet Caprice, Chevrolet Impala, Buick LeSabre, Buick Electra, Oldsmobile Delta 88, Oldsmobile Ninety-Eight, Pontiac Bonneville, and Pontiac Catalina.

The front coilover system allows up to 2 inches of rise or drop from stock ride height. The rear coilover system allows 0.5 inches above stock to 2 inches below stock. This range provides enough adjustment to achieve the correct stance while maintaining proper suspension geometry for big wheel fitment.

Yes. The Level 2 kit uses double-adjustable coilover shocks, meaning both compression and rebound damping can be tuned independently. This allows you to dial in the ride quality for street cruising, show use, or drag racing as needed.

Yes. The coilover system in the QA1 BW02-GMB5 Level 2 Big Wheel Kit includes springs selected to maximize performance for average-weight small block and LS-powered vehicles with stock trim. Modified or heavily built vehicles may benefit from custom spring rate selection.

QA1 stands behind the quality of its suspension components. Contact QA1 directly or refer to QA1's current warranty policy for specific coverage terms on the BW02-GMB5 kit components.

Installation Notes

1. Perform a full vehicle weight measurement before ordering to confirm compatibility with included spring rates
2. Remove all factory front and rear suspension components before installing the new coilover systems and control arms
3. Install adjustable trailing arms and set initial position before lowering the vehicle to the ground
4. Set desired ride height with the vehicle at full weight on a flat surface before final torque
5. Use the adjustable lower trailing arms to center the rear axle in the wheel well after ride height is set
6. Adjust upper trailing arms to correct pinion angle after trailing arm adjustments are complete
7. Torque all fasteners to QA1 specification with vehicle at ride height
8. Perform a full alignment after installation
9. Check all fastener torque and suspension adjustment after the first 100 miles

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.