UMI Performance Adjustable Extended Length Lower Rear Control Arms - Black (1978-1996 GM B-Body) (3612-B)
Correct rear wheel alignment, eliminate wheel-hop, and perfectly center the rear axle within the rear wheel openings of your vehicle with the UMI Performance Adjustable Extended Length Lower Rear Control Arms (3612-B). Specially designed for 1978-1996 GM B-Body platforms—including the Chevrolet Impala SS, Caprice, Buick Roadmaster, and LeSabre—these heavy-duty tubular control arms feature an extended baseline length (+5/8") to fix the factory aesthetic mis-centering common on B-Body vehicles.
Constructed from 1.500" OD x 0.120" wall thickness DOM steel tubing and 100% TIG-welded for maximum strength, these control arms feature double-adjustable 4140 chromoly threaded tube adapters, allowing an additional 1/4" of fine-tune adjustment beyond the initial 5/8" extension. Integrated sway bar mounting holes are reinforced with TIG-welded 0.120" steel sleeves and include CNC-machined billet aluminum mounting spacers to accept stock or aftermarket rear sway bars. Pre-assembled with low-deflection greaseable polyurethane bushings, they arrive finished in a durable gloss black powder coat and include Grade 10.9 sway bar mounting hardware.
Features
- 5/8" extended length design perfectly centers rear wheels within the fender arches on Impala SS and Caprice models
- Double-adjustable design permits an additional 1/4" of fine-tune length adjustment for precise thrust angle alignment
- Built from heavy-duty 1.500" OD x 0.120" wall thickness DOM steel tubing with 100% TIG-welded construction
- High-strength 4140 chromoly CNC-machined threaded tube adapters and bushing threads
- Reinforced sway bar mounting holes featuring TIG-welded 0.120" steel internal sleeves
- Includes CNC billet aluminum sway bar spacers for mounting factory or aftermarket sway bars
- Compatible with UMI weld-in lower control arm relocation brackets (P/N 3610)
- Pre-assembled with low-deflection, greaseable polyurethane bushings for firm power delivery
- Includes grade 10.9 replacement sway bar mounting hardware
- Durable gloss black powder coat finish protects against rust and corrosion
Specifications
- SKU: 3612-B
- Manufacturer: UMI Performance
- Country of Origin: USA
- Material: 1.500" OD x 0.120" Wall DOM Steel Tubing
- Threaded Adjusters: 4140 Chromoly Steel
- Bushings: Greaseable Polyurethane
- Baseline Extension: +5/8" over factory length
- Additional Adjustment: +1/4" extended adjustment range
- Finish: Gloss Black Powder Coat
- Product Weight: 16.0 lbs
- Dimensions: 26" x 6" x 6"
- Unit of Measure: Pair (Driver & Passenger Side)
- Sway Bar Hardware: Included (Grade 10.9)
- Frame Hardware: Uses OEM Bolts (or optional aftermarket kit)
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 ensure proper slip-yoke engagement.
- Relocation Bracket Compatibility: Fully compatible with UMI weld-in relocation brackets (P/N 3610) by rotating the included billet sway bar spacer block.
- Direct bolt-in installation using basic shop hand tools (estimated 1-2 hours install time).
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
