Since its introduction, UMI’s Stage 3 kit has been the choice for GM A-body owners looking to achieve great street manners combined with Pro-Touring handling capability. In this newest revision we’ve refined our parts list to provide the most common options in one convenient package. Simply click and enjoy the performance. Up front you’ll find Delrin lower a-arm bushings for precise steering along with ½” taller upper ball joints to plant that tires contact patch. Out back we include our popular Roto-Joints and an adjustable length upper control arm so the axle can articulate nicely after you’ve perfected the driveline angle. Sway bars are UMI’s tried and true 1-1/4” front and 1” rear for a great front to rear handling balance. We are especially proud to introduce our own ultra-premium springs built from CrSi wire and featuring 530 lb/in front and 130 lb/in linear rates. These carefully selected rates help your car split the difference between a comfortable ride and awesome handling. And what better to control the UMI springs than UMI's hot new SP series monotube shocks. The kit is available in beautiful red or black powder coat and is 100% designed, tested, manufactured and raced out of our shop in Philipsburg, PA – USA.
- Rear trailing arms feature Poly and Roto-Joints as well as adjustable uppers for setting pinion angle and rear lateral location
- 1.250” front sway bar for flat cornering, CNC bent from 4140, balanced with 1” solid heat formed rear sway bar
- UMI springs with linear rates front and rear for consistent handling (530 lb/in front, 130 lb/in rear)
- Lower a-arms feature UMI-built Delrin bushings and accept standard springs or coilovers
- Increased spindle height by 1/2” via tall upper ball joints for improved camber gain
- Upper a-arms add caster for improved steering feel and straight line stability
- Roto-Joints allow smooth articulation for improved handling and less bind
- Bilstein gas charged shocks
