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UMI Perf 78-88 Monte Carlo, 82-03 S10/S15 Upper & Lower A-arm, Coilover Only

SKU: 305756-3-B

Availability: In stock

Handling Time: 30 Days


1978-1988 GM G-Body, 1982-2003 S10/S15 Upper & Lower A-arm, Coilover Only

Tremendous front grip and a host of features can be yours with UMI’s 305756-3 kit. This a-arm kit enables 10 degrees caster while maintaining standard track width and wheelbase. The lower shock mount is removable to allow spring/shock changes at the track. The tall lower ball joint optimizes roll center, camber gain, center of gravity and lowers ride height by ½”. Delrin bushings help the lower a-arm to travel smoothly for bind-free operation. The new lower a-arm works in conjunction with our popular 3056-3 adjustable upper arm which features minimal shim adjustability, 1” taller-than-stock ball joints and super smooth rod ends. Also included on the lower a-arm is a double shear sway bar mounting system which accepts UMI sway bars and many other manufacturers stock location aftermarket units. An aluminum steering stop is adjustable and limits steering lock to prevent tire and wheel damage. Available in UMI red or black powder coat. 100% designed, manufactured and raced with pride in the USA. Battle tested on the iconic UMI Green Machine.

Performance note: UMI recommends adding the P/N 3060 bump steer kit for optimal performance.


Performance a-arm kit is a direct bolt-in for 1978-1988 GM G-Body.

Adjustable upper a-arm uses rod ends for easy alignment.

Total of 10 degrees caster potential while maintaining spindle pin location.

Upper ball joint moved rearward to add 5-6 degrees caster potential.

Lower ball joint relocated forward to increase caster 4-5 degrees which improves steering feel and straight line stability.

Rod ends feature superior friction reduction for quick response.

UMI built Delrin bushings improve steering response and reduce deflection.

Taller upper ball joints to improve camber gain, optimize roll center and improve traction during cornering.

Upper and lower a-arms built from USA Made DOM steel tubing.

Removable double shear mount to allow spring/shock replacement without removing spindle.

Mount spacing suitable for Afco, Viking, Ridetech and many other aftermarket manufacturers shock/spring combos.

Adjustable steering stop.

Double shear swivel sway bar mounts and hardware work with UMI P/N 3035 and most other factory eyelet style sway bars.

Designed, tested, manufactured and raced in Philipsburg, PA-USA.

Fitment Details

Year Make Model Trim Engine Notes
1978 Buick Regal
1979 Buick Regal
1980 Buick Regal
1981 Buick Regal
1982 Buick Regal
1983 Buick Regal
1984 Buick Regal
1985 Buick Regal
1986 Buick Regal
1987 Buick Regal
1978 Chevrolet El Camino
1979 Chevrolet El Camino
1980 Chevrolet El Camino
1981 Chevrolet El Camino
1982 Chevrolet El Camino
1983 Chevrolet El Camino
1984 Chevrolet El Camino
1985 Chevrolet El Camino
1986 Chevrolet El Camino
1987 Chevrolet El Camino
1978 Chevrolet Malibu
1979 Chevrolet Malibu
1980 Chevrolet Malibu
1981 Chevrolet Malibu
1982 Chevrolet Malibu
1983 Chevrolet Malibu
1978 Chevrolet Monte Carlo
1979 Chevrolet Monte Carlo
1980 Chevrolet Monte Carlo
1981 Chevrolet Monte Carlo
1982 Chevrolet Monte Carlo
1983 Chevrolet Monte Carlo
1984 Chevrolet Monte Carlo
1985 Chevrolet Monte Carlo
1986 Chevrolet Monte Carlo
1987 Chevrolet Monte Carlo
1988 Chevrolet Monte Carlo
1982 Chevrolet S10
1983 Chevrolet S10
1984 Chevrolet S10
1985 Chevrolet S10
1986 Chevrolet S10
1987 Chevrolet S10
1988 Chevrolet S10
1989 Chevrolet S10
1990 Chevrolet S10
1991 Chevrolet S10
1992 Chevrolet S10
1993 Chevrolet S10
1994 Chevrolet S10
1995 Chevrolet S10
1996 Chevrolet S10
1997 Chevrolet S10
1998 Chevrolet S10
1999 Chevrolet S10
2000 Chevrolet S10
2001 Chevrolet S10
2002 Chevrolet S10
2003 Chevrolet S10
1983 Chevrolet S10 Blazer
1984 Chevrolet S10 Blazer
1985 Chevrolet S10 Blazer
1986 Chevrolet S10 Blazer
1987 Chevrolet S10 Blazer
1988 Chevrolet S10 Blazer
1989 Chevrolet S10 Blazer
1990 Chevrolet S10 Blazer
1991 Chevrolet S10 Blazer
1992 Chevrolet S10 Blazer
1993 Chevrolet S10 Blazer
1994 Chevrolet S10 Blazer
1978 GMC Caballero
1979 GMC Caballero
1980 GMC Caballero
1981 GMC Caballero
1982 GMC Caballero
1983 GMC Caballero
1984 GMC Caballero
1985 GMC Caballero
1986 GMC Caballero
1987 GMC Caballero
1982 GMC S15
1983 GMC S15
1984 GMC S15
1985 GMC S15
1986 GMC S15
1987 GMC S15
1988 GMC S15
1989 GMC S15
1990 GMC S15
1983 GMC S15 Jimmy
1984 GMC S15 Jimmy
1985 GMC S15 Jimmy
1986 GMC S15 Jimmy
1987 GMC S15 Jimmy
1988 GMC S15 Jimmy
1989 GMC S15 Jimmy
1990 GMC S15 Jimmy
1991 GMC S15 Jimmy
1991 GMC Sonoma
1992 GMC Sonoma
1993 GMC Sonoma
1994 GMC Sonoma
1995 GMC Sonoma
1996 GMC Sonoma
1997 GMC Sonoma
1998 GMC Sonoma
1999 GMC Sonoma
2000 GMC Sonoma
2001 GMC Sonoma
2002 GMC Sonoma
2003 GMC Sonoma
2004 GMC Sonoma
1978 Oldsmobile Cutlass
1979 Oldsmobile Cutlass
1980 Oldsmobile Cutlass
1981 Oldsmobile Cutlass
1985 Oldsmobile Cutlass
1986 Oldsmobile Cutlass
1987 Oldsmobile Cutlass
1988 Oldsmobile Cutlass
1978 Oldsmobile Cutlass Calais
1979 Oldsmobile Cutlass Calais
1980 Oldsmobile Cutlass Calais
1981 Oldsmobile Cutlass Calais
1982 Oldsmobile Cutlass Calais
1983 Oldsmobile Cutlass Calais
1984 Oldsmobile Cutlass Calais
1982 Oldsmobile Cutlass Ciera
1983 Oldsmobile Cutlass Ciera
1984 Oldsmobile Cutlass Ciera
1985 Oldsmobile Cutlass Ciera
1986 Oldsmobile Cutlass Ciera
1987 Oldsmobile Cutlass Ciera
1988 Oldsmobile Cutlass Ciera
1980 Oldsmobile Cutlass Cruiser
1981 Oldsmobile Cutlass Cruiser
1982 Oldsmobile Cutlass Cruiser
1983 Oldsmobile Cutlass Cruiser
1978 Oldsmobile Cutlass Salon
1979 Oldsmobile Cutlass Salon
1980 Oldsmobile Cutlass Salon
1985 Oldsmobile Cutlass Salon
1986 Oldsmobile Cutlass Salon
1987 Oldsmobile Cutlass Salon
1978 Oldsmobile Cutlass Supreme
1979 Oldsmobile Cutlass Supreme
1980 Oldsmobile Cutlass Supreme
1981 Oldsmobile Cutlass Supreme
1982 Oldsmobile Cutlass Supreme
1983 Oldsmobile Cutlass Supreme
1984 Oldsmobile Cutlass Supreme
1985 Oldsmobile Cutlass Supreme
1986 Oldsmobile Cutlass Supreme
1987 Oldsmobile Cutlass Supreme
1988 Oldsmobile Cutlass Supreme
1982 Pontiac Bonneville
1983 Pontiac Bonneville
1984 Pontiac Bonneville
1985 Pontiac Bonneville
1986 Pontiac Bonneville
1978 Pontiac Grand Prix
1979 Pontiac Grand Prix
1980 Pontiac Grand Prix
1981 Pontiac Grand Prix
1982 Pontiac Grand Prix
1983 Pontiac Grand Prix
1984 Pontiac Grand Prix
1985 Pontiac Grand Prix
1986 Pontiac Grand Prix
1987 Pontiac Grand Prix