UMI Boxed Adjustable Lower A-Arms, Rod Ends



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UMI’s heavy duty boxed lower a-arms P/N 2309 with dual rod ends provides a rock-solid foundation for your autocross, road race or corner carving 4th Gen. The a-arms fully gusseted box tubing construction, while appearing robust, affords a five pound weight savings per set over factory lower a-arms. The tube adapters for mounting the rod ends are crafted from 4140 CrMo steel to enhance thread durability and guarantee years of trouble free use. Revised ball joint location adds a nominal 2 degree caster increase. These arms have double shear sway bar mount tabs with endlink set included. These A-arms are designed to work with the factory K-member, UMI k-members, and virtually all aftermarket K-members. Crafted with pride in Philipsburg, PA- USA.


Hardware kit, Part # 2301 – Lower a-arm hardware kit includes Grade 10.9 bolts, washers and lock nuts.


Product features:

  • 0.120” wall mild steel box tubing
  • 5lbs lighter than factory a-arms
  • Double shear sway bar mount with endlink set included
  • Pedestal mount fits DeCarbon, Koni, Bilstein and aftermarket GM t-bar
  • Nominal 2 degree caster increase potential
  • Double gusset design for flex-free operation
  • TIG welded 4140 CrMo threaded tube adapters
  • Premium ball joints installed
  • Race quality high misalignment rod end on vertical mount
  • CNC machined ball joint cups, tubing radiuses & mounting plates
  • Available in red or black powder coat
  • Uses OEM hardware or UMI P/N 2301
  • 100% Made In USA

Red, Black


Manual, 4l60e, Th350, Th400, 4l80e


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