1968-1972 GM A body (Chevelle, GTO, 442, etc.)
UMI Performance adjustable rear upper control arms with Roto-Joints.
Eliminate wheel hop, increase traction, and improve handling performance with an easy bolt on installation. The UMI Performance adjustable upper control arms feature on car adjustability, and are supplied with spherical Roto-Joints. The Roto-Joint uses a pivot ball lined with a greaseable delrin race designed to offer 28 degrees of total unrestricted movement, more than adequate for a bind free, low friction operation. The Roto-Joint design improves performance over the factory rubber and aftermarket polyurethane bushings by allowing the suspension to articulate correctly, and provide precision handling. The installed UMI Roto-Joint allows bind-free rear end movement, when improved handling, auto-cross, or road racing is planned, while still being a 100% streetable setup. The installed delrin race, which lines the spherical ball, absorbs shock and road noise for a quiet and smooth operation on any street or track driven vehicle.
For ease of adjustment, UMI has designed their upper control arms with on car adjustability. Pinion angle adjustments can easily be made in the garage or at the track, and making adjustments is as simple as loosening two jam nuts. Using UMI's chrome moly on car adjuster, simply turn the adjuster with the control arms attached to the vehicle, to quickly lengthen or shorten the control arm. As you shortened or lengthen the control arms, you are rotating the rear end, changing the pinion angle. Pinion angle adjustments are crucial when wanting to lower your track 60 foot times, increase traction, and reduce unwanted wheel hop.
Available in a gloss red or black powdercoat.