UMI Performance ABF806-1-B Stage 3.5 GM A-Body Handling Kit | 1" Lowering | Black

The UMI Performance ABF806-1-B Stage 3.5 Handling Kit is a comprehensive suspension upgrade package engineered to transform a GM A-Body from a comfortable street cruiser into a serious corner-carving machine. Every component in this kit is designed, manufactured, and assembled by UMI Performance in Philipsburg, PA using U.S. materials, and backed by Grade 8 mounting hardware throughout.

At the heart of the kit are UMI's ultra-premium CrSi lowering springs with carefully tuned linear rates — 530 lb/in front and 130 lb/in rear — providing 1" of drop and a consistent, connected feel that eliminates the factory floating sensation. These springs are paired with UMI rebound-adjustable monotube shocks, allowing fine-tuned damping adjustment to suit everything from spirited back-road driving to autocross course work.

Up front, tubular upper and lower A-arms feature precision UMI-built Delrin bushings and caster-corrected geometry for improved steering feel and straight-line stability. The ½" taller upper ball joints increase spindle height to correct the factory camber curve when lowering springs are installed, improving camber gain and tire contact patch. The front suspension is rounded out by a 1-1/4" solid front sway bar CNC-bent from 4140 steel, complete with new bushings and endlinks for flat, controlled cornering.

Out back, tubular rear lower control arms combine Roto-Joints and polyurethane bushings, while adjustable rear upper control arms with Roto-Joints allow precise pinion angle and rear lateral location tuning. Roto-Joints allow smooth suspension articulation with reduced bind for improved handling on street and track. The rear roll stiffness is managed by a tubular, adjustable 1" pro-touring rear sway bar in a chassis-mounted design, well-balanced with the front bar and spring rates for street, canyon, or occasional dragstrip use. Replacement polyurethane rear end housing bushings and heavy-duty frame braces with high-grade hardware complete the rear package.

Kit Includes:

• UMI rebound-adjustable monotube shocks (front and rear)
• 1" lowering springs — linear rates (530 lb/in front, 130 lb/in rear) — ultra-premium CrSi construction
• Tubular front lower A-arms with UMI Delrin bushings, premium ball joints, and bump stops
• Tubular front upper A-arms with Delrin bushings and ½" taller (caster-corrected) ball joints
• 1-1/4" solid front sway bar (4140, CNC-bent) with new bushings and endlinks
• Rear lower control arms with Roto-Joint and polyurethane combination
• Adjustable rear upper control arms with Roto-Joints
• Tubular and adjustable 1" pro-touring rear sway bar, chassis-mounted
• Replacement polyurethane rear end housing bushings
• Heavy-duty frame braces with high-grade hardware
• Grade 8 mounting hardware throughout

The complete Stage 3.5 kit is black powder-coated for a clean, durable finish. Compatible with SBC, Pontiac 400, and BBC engines with aluminum heads/intakes. Note: Lightweight LS engine applications may require spring trimming.