UMI Performance ABF805-1-B Stage 3 GM A-Body Handling Kit 1-Inch Lowering Black

UMI Performance's Stage 3 Handling Kit is a comprehensive suspension upgrade engineered for GM A-Body owners who demand Pro-Touring handling performance without sacrificing everyday drivability. This complete bolt-in package delivers precision steering, flat cornering, and a confident, planted ride — all from components 100% designed, tested, manufactured, and raced in Philipsburg, PA, USA. Available in black powder coat finish.

What's Included:

• #4028 — Tubular frame braces with hardware
• #4032 — Tubular front lower A-arms with UMI-built Delrin bushings (accepts standard springs or coilovers)
• #4033-1 — Tubular front upper A-arms with Delrin bushings and ½" taller ball joints
• #4035 — Heavy-duty 1-1/4" front sway bar with new bushings and end links (CNC-bent from 4140 steel)
• #4037 — Adjustable rear upper control arms with Roto-Joints
• #4038 — Tubular rear lower control arms with Roto-Joints
• #4034 — Solid 1" heat-treated rear sway bar
• #4050 — 1" lowering springs with linear spring rates (530 lb/in front, 130 lb/in rear)
• #3000 — Replacement rear end housing bushings
• #4001 — Rear control arm Grade 8 hardware kit
• #4004 — Front upper and lower Grade 8 hardware kit
• (4) UMI SP Series monotube shocks, designed and tuned for optimum ride quality and responsive handling

Key Features & Benefits:

• Precision Steering: Delrin lower A-arm bushings deliver direct, accurate steering response with minimal deflection
• Improved Camber Gain: ½" taller upper ball joints increase spindle height for a better tire contact patch and improved camber curve — works in conjunction with the lowering springs
• Caster Correction: Upper A-arms add caster for improved steering feel and straight-line stability
• Roto-Joint Rear Arms: Roto-Joints allow smooth axle articulation for reduced bind and improved handling compliance
• Adjustable Pinion Angle: Adjustable-length rear upper control arms allow precise pinion angle and rear lateral location tuning
• Balanced Sway Bars: 1-1/4" front bar (CNC-bent 4140) paired with a 1" solid heat-formed rear bar for flat, neutral cornering balance
• Ultra-Premium Springs: CrSi wire construction with linear 530 lb/in front and 130 lb/in rear rates for consistent, predictable handling
• SP Series Monotube Shocks: Monotube construction tuned specifically to complement UMI's spring rates for optimum ride quality and performance
• American Made: Every component designed, manufactured, and race-tested in UMI's Philipsburg, PA facility

Important Notes:

• Small block motors, Pontiac 400, and big block engines with aluminum heads and intake manifolds typically sit level with this kit
• Vehicles with full-weight big block engines may experience an additional ¼" front end drop
• Lightweight LS engine swaps may require trimming front springs in ¼-coil increments to achieve desired ride height

This kit ships in multiple oversized boxes. Grade 8 hardware and all necessary mounting components are included for a complete front and rear suspension overhaul.