UMI Performance FBF002-B Stage 2 Handling & Lowering Kit 2" Drop Black

The UMI Performance FBF002-B is a comprehensive Stage 2 handling and lowering kit engineered to transform a 2nd Gen GM F-Body into a modern, responsive driver. This complete system addresses every major weakness in the factory suspension — from vague steering feel to excessive body roll and ride height — through a precisely matched collection of USA-made components.

At the front, a caster-corrected polyurethane-bushed lower A-arm (P/N 2651-B) relocates the lower ball joint to increase caster for improved straight-line stability and steering response. Paired with a Delrin-bushed CrMo cross-shaft upper A-arm (P/N 2653-1-B) that adds additional caster and features a ½" taller upper ball joint, the geometry combination significantly improves camber gain during cornering. A 1-¼" front sway bar (P/N 4035-B) with polyurethane bushings and endlinks rounds out the front suspension by resisting body roll and sharpening turn-in response.

2" front lowering springs (P/N 2647F) are manufactured from premium chromium-silicon (CrSi) wire with a firm yet streetable 600 lb/in spring rate, eliminating the floaty feel of factory springs without introducing harshness. At the rear, 2" drop leaf springs (P/N 2620) with a 175 lb/in spring rate are delivered with the front bushing pre-installed. They deliver a balanced combination of lowered stance and daily-driver comfort. Bilstein shocks with comfortable compression valving and high-performance rebound valving complement the springs, controlling body motion through transitions and aggressive corners alike.

The rear hardware is fully upgraded with a laser-cut shackle kit (P/N 2625) fitted with high-performance polyurethane bushings, along with heavy-duty USA-made U-bolts, a front bolt, and polyurethane axle pads (P/N 2627) to replace worn, corroded factory hardware.

Kit Includes:

• P/N 4035-B — 1-¼" front sway bar with polyurethane bushings and endlinks
• P/N 2651-B — Polyurethane bushing lower A-arm with increased caster
• P/N 2653-1-B — Delrin bushing CrMo cross-shaft upper A-arm with ½" taller upper ball joint
• P/N 2647F — 2" front lowering springs, CrSi wire, 600 lb/in spring rate
• P/N 2620 — 2" drop rear leaf springs (175 lb/in) with front bushing installed
• P/N 2625 — Laser-cut shackle kit with polyurethane bushings
• P/N 2627 — Heavy-duty U-bolts, front bolt, and polyurethane axle pads
• Bilstein shocks with comfort compression and performance rebound valving

Optional Hardware Kit: Upper and lower A-arm installation hardware is available separately. Use P/N 2602 for 1970–1974 applications or P/N 2603 for 1975–1981 applications.

Every component in the FBF002-B kit is 100% Made in the USA from USA-sourced materials, backed by UMI's two-year warranty against defects in materials and workmanship. This kit is equally at home on a weekend back road run or daily commute.