Suspension and Components› Front Suspension Components
UMI PERFORMANCE
UMI Performance 64-72 GM A-Body Front Upper A-arms Adjustable 1/2in Taller Ball Joints
SKU: U01C 4056-2-B
Moderate — 2–4 hours
Description
Part #: 4056-2-B
Today's Pro Touring A-bodies are handling like never before. Achieve your goal of awesome handling with UMI's new adjustable upper a-arm. This arm precisely locates a " taller upper ball joint which in turn improves the camber curve and results in more front end grip. The advanced design of the a-arm also relocates the ball joint plate rearward for increased caster and improved steering feel. The machined CrMo cross shaft holds two precision rod ends which are used to adjust the arm sections. These arms are TIG welded to the laser cut ball joint pad which houses a " taller upper ball joint. A laser cut bump stop brace completes the arm. If used for drag racing, the arm can also accommodate a travel limiter. The 4056-2 a-arm is designed to work with factory height spindles and increases spindle height by ". UMI's a-arm set is available in beautiful red or black powder coat and is hand built in Philipsburg, PA - USA of US materials.
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
MIA's Description
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | UMI PERFORMANCE |
| Part Number | U01C 4056-2-B |
Videos
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy