SZ Series - Suspension Shock AbsorberBilstein SZ Series shock absorbers feature a 46mm piston, steel construction and smooth body designed for motorsports applications. These shock absorbers are available in a variety of lengths and standard digressive valve settings that utilize proprietary spring steel valve discs and can be converted to a coilover design (kit sold separately). SZ Series shock absorbers are ideal for racers whose sanctioning rules do not allow or require rebuild

while allowing smooth articulation

greaseable polyurethane bushings and zerk grease fittings all combined to make the best arms on the market

while the rear springs offer 1" or 2" lowering options to fine-tune stance

Installation instructions and new 10

and lateral loads are applied to the chassis

we were driven to develop the best solutions on the market for roll over safety starting with our DIY Roll cage kits

precision alignment

UMI’s lower A-arms embody American craftsmanship

Many kits in the aftermarket yield a truck with annoying vibrations and a harsh ride

SS203052 - 1964-1966 GM A-Body UMI Shock/Spring Kit

adding strength

1970-1974 cars use ½” standard hardware on the lower a-arms while 1975-1981 use 14mm metric control arm hardware