UMI Performance Rear Extended Length Lower Control Arms w/ Roto-Joint & Poly Bushings - Boxed - Black (1978-1996 GM B-Body) (3622-B)
Optimize wheelbase geometry, eliminate suspension bind, and center the rear wheels perfectly within the wheel arches of your vehicle with the UMI Performance Boxed Extended Length Lower Control Arms featuring Roto-Joints and Polyurethane Bushings (3622-B). Specially designed for 1978-1996 GM B-Body platforms—including the Chevrolet Impala SS, Caprice, Buick Roadmaster, and LeSabre—these heavy-duty boxed trailing arms feature a +5/8" extended length to correct the factory aesthetic mis-centering common on B-Body rear wheel wells.
Constructed from heavy-wall 0.120" rectangular mild steel tubing with precision CNC-machined DOM steel bushing holders, these arms combine a chassis-side greaseable polyurethane bushing with an axle-side UMI Roto-Joint. The high-performance spherical Roto-Joint allows full bind-free suspension rotation and articulation during hard cornering and drag launches, while the polyurethane bushing absorbs unwanted road noise, vibration, and harshness (NVH). Direct bolt-in installation, finished in a durable gloss black powder coat, and best paired with extended length upper control arms (such as UMI 3619, 3620, or 3624).
Features
- +5/8" extended length design perfectly centers the rear wheels within the fender arches on Impala SS and Caprice models
- Features UMI's rebuildable spherical Roto-Joint for smooth, bind-free articulation and maximum suspension travel
- Chassis-side modern-formulation greaseable polyurethane bushings absorb road noise and vibration
- Built from heavy-duty 0.120" wall thickness rectangular steel tubing for high strength and rigidity
- Precision CNC-machined DOM steel bushing holders and MIG-welded end caps to prevent internal debris build-up
- Direct bolt-in upgrade; pairs perfectly with UMI extended rear upper control arms (P/N 3619, 3620, or 3624)
- Durable gloss black powder coat finish protects against rust, corrosion, and road grime
- 100% designed, tested, and manufactured in the USA
Specifications
- SKU: 3622-B
- Manufacturer: UMI Performance
- Country of Origin: USA
- Material: 0.120" Wall Rectangular Mild Steel Tubing
- Joints & Bushings: Axle-Side Roto-Joint / Chassis-Side Polyurethane
- Baseline Extension: +5/8" extended length over OEM
- Control Arm Style: Boxed Non-Adjustable
- Finish: Gloss Black Powder Coat
- Weight: N/A
- Dimensions: N/A
- Unit of Measure: Pair (Driver & Passenger Side)
- Installation Time: 1 Hour (Direct Bolt-On)
- Hardware: Uses OEM Frame Bolts
Fitment Notes
- Position: Rear Lower Control Arms (Pair).
- Fits 1978-1996 GM B-Body platforms (Chevrolet Impala SS, Caprice, Buick Roadmaster, LeSabre, Pontiac Bonneville, Catalina).
- Driveshaft Note: Depending on ride height and axle positioning, extended control arms may require a custom longer driveshaft to maintain proper slip-yoke engagement.
- Recommended Upper Arms: For optimal axle alignment and pinion angle setup, use with UMI extended length upper control arms (3619, 3620, or 3624).
- Direct bolt-in design using OEM frame hardware.
Fitment
1991 Buick Roadmaster
1992 Buick Roadmaster
1993 Buick Roadmaster
1994 Buick Roadmaster
1995 Buick Roadmaster
1996 Buick Roadmaster
1978 Buick LeSabre
1979 Buick LeSabre
1980 Buick LeSabre
1981 Buick LeSabre
1982 Buick LeSabre
1983 Buick LeSabre
1984 Buick LeSabre
1985 Buick LeSabre
1978 Chevrolet Caprice
1979 Chevrolet Caprice
1980 Chevrolet Caprice
1981 Chevrolet Caprice
1982 Chevrolet Caprice
1983 Chevrolet Caprice
1984 Chevrolet Caprice
1985 Chevrolet Caprice
1986 Chevrolet Caprice
1987 Chevrolet Caprice
1988 Chevrolet Caprice
1989 Chevrolet Caprice
1990 Chevrolet Caprice
1991 Chevrolet Caprice
1992 Chevrolet Caprice
1993 Chevrolet Caprice
1994 Chevrolet Caprice
1995 Chevrolet Caprice
1996 Chevrolet Caprice
1994 Chevrolet Impala SS
1995 Chevrolet Impala SS
1996 Chevrolet Impala SS
1977 Pontiac Bonneville
1978 Pontiac Bonneville
1979 Pontiac Bonneville
1980 Pontiac Bonneville
1981 Pontiac Bonneville
1977 Pontiac Catalina
1978 Pontiac Catalina
1979 Pontiac Catalina
1980 Pontiac Catalina
1981 Pontiac Catalina
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
