UMI Performance · New
UMI Performance 78-88 GM G-Body 82-03 S10/S15 Front Lower A-arms Coilover Only
MPN 3057-1-B · Store SKU umi3057-1-B
Supplier stock checked 11/7/2026, 4:21:25 AM UTC. Adding a part does not reserve it.
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Product details
UMI’s 3057-1 lower a-arms arms feature a relocated ball joint cup which offers 10 degrees caster when used with our P/N 3056 upper arm while keeping the spindle pin centered. The 3/4” taller Howe ball joint works to optimize the roll center, lower the center of gravity and lowers the ride height ½”. The double shear shock mount is removable which permits spring and shock changes at the track in minutes without disconnecting the ball joints. An aluminum steering stop is adjustable and limits steering lock to prevent tire and wheel damage. UMI designed Delrin bushings help the 3057-1 travel smoothly for bind-free operation whether running street, strip, road race or auto-x. Also included is a double shear sway bar mounting system which accepts UMI sway bars and many other manufacturers stock location aftermarket units. Available in UMI red or black powder coat. 100% designed, manufactured and raced with pride in the USA. Battle tested on the iconic UMI Green Machine Performance note: UMI recommends adding the P/N 3060 bump steer kit for optimal performance. Lower a-arms work best when used in conjunction with caster corrected upper a-arms. Double shear swivel sway bar mounts and hardware work with UMI P/N 3035 and most other factory eyelet style sway bars. Mount spacing suitable for Afco, Viking, Ridetech and many other aftermarket manufacturers shock/spring combos. Removable double shear mount to allow spring/shock replacement without removing spindle. Suitable for competition use. Road race, auto-x, drag race, street corner carving. 3057-1 - 1978-1988 GM G-Body, 1982-2003 S10/S15 Front Lower A-arms, C/O Only 10 degrees caster potential when combined with UMI 3056 upper a-arm. Designed, tested, manufactured and raced in Philipsburg, PA-USA. Smooth travel Delrin bushings, UMI designed and machined. Saves 3.2lbs per set as compared to stock stamped a-arms. 1-¼" and 1-½” USA DOM tubing construction. CNC laser cut components throughout. Adjustable steering stop. Features:
Manufacturer fitment & guides
Check 3057-1-B against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- California Proposition 65: Y
