A fixed rear spring rate is a compromise between ride and grip, and on a 3rd or 4th Gen F-Body built for corner carving that compromise usually costs lap time. This UMI weight jack replaces the standard rear spring with a load-adjustable system, so ride height and effective rear spring load can be tuned from underneath the car without swapping springs.

UMI Performance 2075-3 Features:

• 200 lb/in recommended spring rate for corner carving, autocross, and road race use.
• Springs wound from premium USA CrSi wire.
• UMI Torrington bearing load adjuster for smooth ride height changes with normal hand tools.
• Includes a poly isolator to dampen road noise.
• Works with factory rear end housings and Strange Engineering housings only.
• Red or black powder coat finish.
• Designed, manufactured, and raced out of Philipsburg, PA, USA.

Notes:

• Minor grinding of the left axle pad is required for installation; instructions included.