UMI Performance Rear Lower Control Arms Boxed - Poly/Roto-Joint - Boxed - Black (1978-1996 GM B-Body) (3626-B)
Eliminate wheel hop, maximize launch traction, and maintain smooth street comfort with the UMI Performance Boxed Rear Lower Control Arms featuring Roto-Joints and Polyurethane Bushings (3626-B). Designed specifically for 1978-1996 GM B-Body platforms—including the Chevrolet Impala SS, Caprice, Buick Roadmaster, and LeSabre—these standard-length heavy-duty trailing arms directly replace weak factory stamped steel arms to handle high-horsepower street, autocross, and drag racing applications.
Fabricated from 3" x 1-1/2" x 0.120" rectangular mild steel tubing, these control arms feature CNC-machined bushing holders, TIG/MIG-welded construction, and steel-sleeved reinforcement for factory sway bar mounting holes. They combine a chassis-side greaseable polyurethane bushing with an axle-side UMI spherical Roto-Joint. Featuring a hard chrome-plated 4140 chromoly ball rotating within self-lubricating Delrin races, the Roto-Joint provides 28 degrees of unrestricted movement to eliminate rear suspension bind while absorbing road shock. Shipped fully assembled in a durable gloss black powder coat finish and includes a spanner wrench for Roto-Joint servicing.
Features
- Standard length boxed lower trailing arms replace flex-prone OEM stamped steel arms
- Features UMI's rebuildable spherical Roto-Joint with 28 degrees of bind-free rotation and suspension travel
- Hard chrome-plated 4140 chromoly spherical ball rotating within self-lubricating Delrin races for high wear resistance
- Chassis-side modern-formulation greaseable polyurethane bushings damp road vibration and noise
- Constructed from 3" x 1-1/2" x 0.120" rectangular steel tubing with CNC-machined bushing holders
- Reinforced sway bar mounting holes with welded steel inner sleeves for increased rigidity
- 100% rebuildable and adjustable joint design; includes spanner wrench for maintenance
- Direct bolt-in upgrade; uses OEM frame hardware and factory sway bar mounting location
- Durable gloss black powder coat finish protects against corrosion, rust, and road debris
- 100% designed, tested, and manufactured in the USA
Specifications
- SKU: 3626-B
- Manufacturer: UMI Performance
- Country of Origin: USA
- Material: 3" x 1-1/2" x 0.120" Rectangular Mild Steel Tubing
- Joints & Bushings: Axle-Side Roto-Joint (Delrin Race) / Chassis-Side Polyurethane
- Control Arm Style: Boxed Non-Adjustable (Standard Length)
- Sway Bar Mount: Reinforced with Steel Sleeves
- Finish: Gloss Black Powder Coat
- Weight: N/A
- Dimensions: N/A
- Unit of Measure: Pair (Driver & Passenger Side)
- Included Accessories: Spanner Wrench for Roto-Joint Adjustment
- Hardware: Uses OEM Frame Hardware
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).
- Standard OEM length; maintains factory axle positioning in wheel arch.
- Compatible with factory stock or aftermarket rear sway bars.
- Direct bolt-in upgrade with no modifications required.
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
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