Fits select 1963-1977 GM A-Body models, including Chevrolet Chevelle, El Camino, Monte Carlo, Pontiac GTO, LeMans, Oldsmobile Cutlass, 442, and Buick Skylark.

Ensure your rear suspension is securely mounted with the UMI Performance Complete Rear Control Arm Bolt Upgrade Kit. When installing aftermarket control arms or restoring your vehicle's chassis, reusing old, fatigued, or rusted factory hardware can compromise safety and alignment. This kit provides a comprehensive set of high-strength fasteners to replace the hardware for both the upper and lower rear control arms.

Every component is zinc-plated for superior corrosion resistance and long-term durability in harsh undercar environments. The included Grade 8 fasteners provide the necessary tensile strength to handle high-torque loads and suspension articulation.

• Manufacturer Part Number: 4002
• Complete kit for both upper and lower rear control arms
• (8) 1/2-inch Grade 8 hex head bolts
• (8) 1/2-inch nylon insert lock nuts
• Hardened flat washers included
• Zinc-plated finish for rust prevention

Fits select 1963-1977 GM vehicles, including Buick Skylark, Chevrolet Chevelle, Camaro, El Camino, and Monte Carlo, Oldsmobile Cutlass and F85, and Pontiac GTO, LeMans, and Firebird.

Don't compromise a high-performance suspension installation by reusing fatigued, rusty factory hardware. The UMI Performance 4001 Rear Control Arm Bolt Upgrade Kit provides a high-strength solution for securing either upper or lower rear control arms. This kit is designed to replace OE hardware with Grade 8 fasteners, ensuring your suspension maintains proper torque retention and alignment under load.

Each component is finished with a protective zinc plating to resist corrosion and ensure long-term durability in harsh undercar environments. This kit includes the necessary hardware to complete one pair of either upper or lower control arms.

• High-tensile Grade 8 steel for superior strength and safety.
• Protective zinc plating for maximum corrosion resistance.
• Nylon lock nuts prevent loosening due to chassis vibration.
• Replaces worn or damaged 1/2" OE control arm hardware.

Specifications:

• Bolt Diameter: 1/2"
• Hardware Grade: Grade 8
• Finish: Zinc Plated
• Manufacturer Part Number: 4001

Kit Includes:

• (4) 1/2" Grade 8 Bolts
• (4) 1/2" Nylon Lock Nuts
• Washers

Fits select 1965-1970 Chevrolet Bel Air, Biscayne, Caprice, and Impala.

This UMI Performance 1-inch solid rear sway bar is engineered to reduce body roll and understeer, significantly improving cornering stability and creating a more balanced suspension feel. Each bar is manufactured from 1-inch solid high-carbon steel, heat-treated and formed as a single piece to ensure maximum strength and performance under heavy suspension loads.

• 1-inch solid high-carbon steel construction
• Heat-treated and one-piece formed for superior durability
• Includes complete Grade 8 mounting hardware for installation
• Compatible with factory lower control arms featuring sway bar holes
• Designed for use with UMI Performance lower control arms (part #3655)
• Fits stock GM axle housings only
• Manufacturer Part Number: 3665-B

Note: This component is intended for use on stock GM axle housings and will interfere with Ford 9-inch rear end conversions.

Fits select 1977-1996 Buick, Chevrolet, and Pontiac B-Body models including Caprice, Impala SS, Roadmaster, LeSabre, Bonneville, and Catalina.

Convert your GM B-Body to a modern coilover setup with UMI Performance rear coilover conversion brackets. These heavy-duty brackets bolt directly to the factory mounting points on the axle, eliminating the need for welding or custom fabrication. When used with compatible coilovers, these brackets enable precise ride height selection and provide the necessary mounting points for tuning compression and rebound damping.

Each bracket is manufactured in the USA from laser-cut steel and precision jig-welded to ensure a perfect fit on factory GM B-body axles. This system provides a rigid, reliable foundation for performance-oriented suspension upgrades on street and track vehicles.

• Manufacturer Part Number: 3623
• Direct bolt-in installation with no welding required
• Heavy-duty laser-cut steel construction
• Precision jig-welded for accurate fitment on factory axles
• Enables ride height and damping adjustability when used with coilovers
• Made in the USA

Fits 1991-1996 Chevrolet Caprice and Impala SS (Base, Classic, LS, LTZ, and SS submodels).

These UMI Performance adjustable extended length lower control arms are engineered to correctly center the rear wheels within the wheel well of your 1991-1996 GM B-Body. Featuring a base 5/8" extension with an additional 1/4" of adjustment, these arms provide the precision needed for perfect rear-end centering. Built for heavy-duty performance, they are constructed from 1.500" diameter, 0.120" wall thickness DOM steel tubing and are fully TIG welded for maximum structural integrity.

Each arm includes reinforced sway bar mounting holes using TIG-welded 0.120" steel sleeves and billet aluminum spacers for secure, factory-location attachment of stock or aftermarket sway bars. For vehicles equipped with UMI weld-in relocation brackets (part #3610), the sway bar spacers can be rotated to maintain compatibility. Please note that due to the extended length, a longer driveshaft may be required depending on your specific ride height. The assembly features high-strength 4140 Chrome moly threaded tube adapters and greaseable bushings to ensure smooth operation and long-term durability.

• Fixed 5/8" extension with 1/4" additional adjustment range
• 1.500" x 0.120" wall DOM steel tubing construction
• Fully TIG welded for superior strength
• 4140 Chrome moly threaded tube adapters and bushing threads
• Greaseable bushings for reduced friction and noise
• Reinforced sway bar holes with 0.120" steel sleeves
• Includes billet aluminum sway bar spacers and 10.9 grade hardware
• Compatible with UMI relocation brackets (Part #3610)
• Durable glossy powder coat finish
• Manufacturer Part Number: 3612-R

Fits 1991-1996 Chevrolet Caprice and Impala SS models. These UMI Performance extended length lower control arms are engineered to correctly center the rear wheels within the wheel well on GM B-Body platforms. These arms feature a fixed 5/8-inch extension with an additional 1/4-inch of adjustment capability for precise rear-end alignment and centering.

Constructed for maximum rigidity, these arms are fabricated from 1.500-inch DOM steel tubing with a 0.120-inch wall thickness. Each unit is fully TIG welded and features 4140 Chrome Moly threaded tube adapters for superior strength under load. The design includes reinforced sway bar mounting holes featuring a TIG-welded 0.120-inch steel sleeve and a billet aluminum spacer to maintain factory sway bar positioning. Note: Due to the extended geometry, a longer driveshaft may be required depending on your vehicle's specific ride height.

• Part Number: 3612-B
• Extended 5/8-inch length with additional 1/4-inch adjustment
• Fabricated from 1.500-inch x 0.120-inch DOM steel tubing
• 4140 Chrome Moly threaded tube adapters and bushing threads
• Fully TIG welded for maximum structural integrity
• Greaseable polyurethane bushings for reduced deflection
• Durable glossy black powder coat finish
• Includes new 10.9 grade sway bar hardware
• Compatible with UMI Performance weld-in relocation brackets (Part #3610)
• Estimated installation time: 1-2 hours

Fits 1978-1988 GM G-Body vehicles including the Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, GMC Caballero, Oldsmobile Cutlass, and Pontiac Bonneville/Grand Prix.

The UMI Performance Modular Adjustable Transmission Crossmember provides a versatile mounting solution for G-Body owners performing transmission swaps or seeking better driveline geometry. Constructed with a laser-cut tab and slot design, this system provides high structural integrity without excessive weight. The modular architecture includes a 5-position CNC-machined billet aluminum transmission mount, allowing for precision adjustment of the driveline angle to prevent vibration and ensure proper alignment.

Engineering for performance clearance, this crossmember features large cutouts specifically designed to accommodate oversized dual exhaust systems. For early production vehicles (1978-1981), UMI includes a CNC-machined billet aluminum frame spacer to ensure a direct-fit installation. This system simplifies the mounting of various transmission models while maintaining the rigidity required for high-performance street and track use.

• Laser-cut tab and slot design for superior strength-to-weight ratio
• 5-position CNC-machined billet aluminum transmission mount for adjustable driveline angles
• Includes CNC-machined billet aluminum spacer for 1978-1981 frame compatibility
• Designed with large cutouts for oversized dual exhaust clearance
• Total weight: 22 lbs
• Finish: Durable Black powder coat
• Transmission bushing mounts sold separately
• Manufacturer Part Number: 3108-B

Fits select 1978-1988 GM G-Body vehicles including Buick Regal, Chevrolet Monte Carlo, El Camino, Malibu, Oldsmobile Cutlass, and Pontiac Grand Prix.

The UMI Performance P/N 3061 frame notch kit provides a professional solution for narrowing the rear upper frame rails on the GM G-Body platform. This modification is essential for enthusiasts looking to install wider rear tires that would otherwise interfere with the factory frame rails. The kit is engineered to maintain structural strength while creating the necessary clearance for aggressive wheel and tire fitments.

Each component is laser-cut from 1/8-inch premium steel to match the frame contour, featuring a slight intentional overhang to facilitate easier welding with a standard MIG welder. The kit also includes end enclosures to bridge the gap between the modified section and the original frame rails for a clean, secure finish.

• Material: 1/8-inch premium laser-cut steel
• Finish: Bare steel for immediate welding
• Design: Follows factory frame contours with intentional overhang
• Includes: Main notch plates and end enclosures
• Installation: Requires cutting, welding, and fabrication
• Origin: Designed and manufactured in Philipsburg, PA - USA
• Manufacturer Part Number: 3061

Fits select 1978-1988 Buick Regal, Chevrolet El Camino, Malibu, and Monte Carlo, Oldsmobile Cutlass, and Pontiac Bonneville and Grand Prix.

Stiffen your chassis and improve handling with the UMI Performance bolt-in rear shock tower brace. This 100% jig-built brace ties the rear upper shock mounts together, allowing them to share the suspension load rather than stressing the individual mounting points. Constructed from high-strength 1-1/4” tubing MIG welded to 3/16” thick laser-cut brackets, this brace provides a precise fit and significant reinforcement for G-Body platforms.

Engineered for versatility, the 3055-R is designed to clear all popular exhaust systems and functions perfectly with both traditional spring/shock combinations and coilover setups. Every brace is manufactured from US steel in Philipsburg, PA, and includes all necessary hardware for a straightforward bolt-in installation.

• Fabricated from 1.25-inch diameter US steel tubing
• 3/16-inch thick laser-cut mounting brackets for maximum durability
• MIG welded construction for structural integrity
• Direct bolt-in installation with included hardware
• Clears aftermarket and OE exhaust systems
• Compatible with standard shocks or coilovers
• Manufacturer Part Number: 3055-R

Fits 1978-1988 GM G-Body vehicles, including Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, Oldsmobile Cutlass, and Pontiac Bonneville and Grand Prix.

Stiffen your chassis and improve suspension response with the UMI Performance rear shock tower brace. This 100% jig-built, bolt-in component ties the rear upper shock mounts together to distribute loads more evenly and reduce frame flex. Designed for maximum versatility, this brace is engineered to clear most popular exhaust systems and works effectively with both traditional shock-and-spring combinations and aftermarket coilover setups.

• Fabricated from 1-1/4 inch US Steel tubing for superior rigidity
• 3/16 inch thick laser-cut brackets for precision fitment to factory mounting points
• High-strength MIG-welded construction
• Direct bolt-on installation; hardware is included
• Durable black powder coat finish
• Manufactured and tested in Philipsburg, PA - USA
• Manufacturer Part Number: 3055-B

Fits select 1978-2003 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles equipped with a Quick Performance Ford 9-inch based rear housing.

The UMI Performance 3054 rear coilover bracket kit provides a robust, bolt-in mounting solution for rear coilovers on Quick Performance axle housings. This kit features a multi-position design allowing for ±¾” fine-tuning of ride height and shock location. To optimize suspension geometry, the brackets offer five trailing arm mounting positions designed to align with Quick Performance 5-hole adjustable lower control arm brackets.

• Manufactured from 3/16” Made in USA mild steel
• 1/2” x 1-1/4” shock mount compatible with most standard racing shocks
• Laser-cut for consistency and precise fitment
• Durable black powder-coated finish
• Upper T-bar reinforcement tabs and installation hardware included
• Minor drilling required for installation
• Compatible with UMI 3055 shock tower brace
• Fits Quick Performance Ford 9" based housings ONLY
• 100% Made in USA
• Manufacturer Part Number: 3054

Fits 1978-1988 GM G-Body models including Buick Regal, Chevrolet El Camino, Malibu, and Monte Carlo, Oldsmobile Cutlass, and Pontiac Bonneville and Grand Prix.

The UMI Performance 3053-R three-point front frame brace is engineered to significantly stiffen the front frame horns and front crossmember area of the GM G-Body platform. By tying these critical points together, this brace reduces chassis flex and improves steering response and handling predictability. It serves as a high-performance replacement for the OE reinforcements and the common "Grand Prix Bar," providing a more rigid three-point connection.

Designed for versatile use in street, strip, autocross, or road racing, this brace maintains a lightweight profile without sacrificing structural integrity. The bolt-in design utilizes factory mounting points for a straightforward installation that requires no drilling.

• Direct Bolt-In: Installs using existing factory points with no drilling required.
• Three-Point Design: Stiffens the front frame horns and crossmember for reduced chassis deflection.
• High-Strength Hardware: Includes a full set of Grade 8 mounting hardware.
• Lightweight Construction: Weighs less than 10 lbs to preserve front-end balance.
• Durable Finish: Protected by a tough red powder coat for maximum corrosion resistance.
• Made in the USA: Designed and manufactured in Philipsburg, PA.
• Manufacturer Part Number: 3053-R

Fits select 1978-1988 Buick, Chevrolet, Oldsmobile, and Pontiac G-Body models, including Regal, El Camino, Malibu, Monte Carlo, Cutlass, Bonneville, and Grand Prix.

UMI Performance front lowering springs are designed to improve both the stance and cornering dynamics of your G-Body. These springs deliver a 2-inch drop for vehicles equipped with standard Small Block Chevy (SBC) or LS-series engines, significantly lowering the center of gravity. Wound from premium 5160 CrSi wire with a linear 600 lb/in rate, they provide a stiffer-than-stock feel that reduces body roll and nose dive, making them ideal for Auto-X, Pro-Touring, and performance street applications.

• Linear 600 lb/in spring rate for consistent, predictable handling
• Wound from high-tensile 5160 CrSi premium spring wire
• 2-inch lowering for SBC and LS-swapped applications
• Provides approximately 2.25-inch drop (1/4-inch rake) on Big Block applications
• Durable black powder coat finish for long-lasting protection
• Proudly manufactured in the USA
• Manufacturer Part Number: 3051F

Note: Lightened vehicles or V6 Turbo Grand National models may require spring trimming to achieve specific ride height targets.

Fits select 1978-2003 GM vehicles, including Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, S10, GMC Caballero, Sonoma, Oldsmobile Cutlass, and Pontiac Grand Prix.

Eliminate the floating sensation and excessive body roll common in factory G-Body and S-Series suspension with the UMI Performance 2-inch lowering spring kit. Engineered in collaboration with a leading Sprint Cup chassis engineer, these springs provide a balanced, linear rate for predictable handling during autocross, pro-touring, or spirited street driving. The increased stiffness significantly improves cornering stability while maintaining a high-quality ride.

Each spring is wound from premium Chromium Silicon wire for maximum durability and resistance to sagging. This kit is optimized for standard Small Block Chevy (SBC) and LS engine swaps. While designed as a direct-fit upgrade, lightened vehicles or V6 Turbo Grand National models may require minor trimming to achieve the exact desired ride height. For Big Block Chevy (BBC) applications, these springs provide a functional 1/4-inch nose-down rake.

• Manufacturer Part Number: 3051
• Front Spring Rate: 600 lb/in (Linear)
• Front Material: 5160 CrSi premium wire
• Rear Spring Rate: 130 lb/in (Linear)
• Rear Material: 9254 CrSi premium wire
• Drop Height: 2.00" front and rear
• Finish: Durable black powder coat
• Origin: Made in the USA

Fits select 1970-1988 GM G-Body and F-Body vehicles, including Buick Regal, Chevrolet Camaro, El Camino, Malibu, Monte Carlo, Oldsmobile Cutlass, and Pontiac Firebird and Grand Prix.

Improve your vehicle's handling and stance with UMI Performance front lowering springs. These springs are engineered to provide a lower center of gravity and significantly reduced body roll compared to soft factory coils. Designed in collaboration with a professional Sprint Cup chassis engineer, these springs offer a linear 600 lb/in rate that provides the support needed for aggressive cornering, autocross, and pro-touring applications while maintaining a refined ride for cruising.

Every spring is wound from high-tensile 5160 CrSi (Chrome Silicon) premium wire to ensure consistent performance and resistance to sagging over time. Whether you are building a corner-carver or a street-driven pro-touring machine, these springs provide the precise spring rate required for modern performance tires and suspension geometry.

• Manufacturer Part Number: 3050F
• Spring Rate: 600 lb/in (Linear)
• G-Body Lowering: 1.0 inch
• F-Body Lowering: 2.5 inches
• Material: 5160 CrSi premium chrome silicon wire
• Application: Street, Autocross, and Pro-Touring

Fits select 1978-1988 Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, Oldsmobile Cutlass, and Pontiac Grand Prix or Bonneville.

Improve your vehicle's cornering capabilities and eliminate excessive body roll with the UMI Performance solid sway bar kit. This kit is engineered to replace the factory 7/8" front sway bar with a more rigid 1.250" solid front bar and a 1" solid rear bar, providing a more balanced suspension feel and reduced understeer during aggressive maneuvers.

Both bars are manufactured from 4140 chromoly steel and formed as a single piece for maximum structural integrity. The front bar is CNC bent for a precise bolt-on fit, while the rear bar undergoes a specific heat-treatment process to ensure it maintains its memory and rate longer than standard cold-bent bars. The kit is finished in a durable powder coat to resist corrosion and includes all necessary heavy-duty hardware for a complete installation.

• Front Sway Bar: 1.250" solid 4140 chromoly steel, CNC bent
• Rear Sway Bar: 1.000" solid 4140 chromoly steel, heat-treated
• Bushings: Greaseable polyurethane sway bar bushings for long-term serviceability
• Hardware: Includes high-quality end links and Grade 8 mounting hardware
• Finish: Powder coated bright red or gloss black
• MPN: 303534-B

Fits select 1978-1988 GM G-Body models, including Buick Regal, Chevrolet El Camino, Malibu, Monte Carlo, Oldsmobile Cutlass, and Pontiac Grand Prix.

The UMI Performance 1.250" solid front sway bar is engineered to transform the handling of the GM G-Body platform by significantly reducing body roll and understeer. Constructed from heavy-duty 4140 solid chrome moly steel, this bar provides a 428 lb/in deflection rate, offering superior rigidity compared to the factory 7/8" bar. Each sway bar is CNC-bent as a single piece to maintain maximum structural integrity and ensure a precise fit during installation.

This kit is designed for a straightforward, direct bolt-on installation using factory mounting points. It comes complete with high-quality end links and greaseable polyurethane bushings housed in zinc-plated clamshells for long-term durability and silent operation.

• Part Number: 3035-B
• Diameter: 1.250" (32mm) solid 4140 chrome moly steel
• Deflection Rate: 428 lb/in
• Center-to-Center Distance: 44 11/16"
• Finish: Durable powder coating available in Bright Red or Gloss Black
• Includes: End links, greaseable bushings, and zinc-plated clamshells
• Fitment: Direct bolt-on for 1978-1988 G-Body vehicles

Fits select 1978-1988 Buick, Chevrolet, Oldsmobile, and Pontiac G-Body vehicles including Regal, El Camino, Malibu, Monte Carlo, Cutlass, and Grand Prix.

The UMI Performance 3034-R is a heavy-duty 1" solid rear sway bar engineered to significantly reduce body roll and understeer while improving overall cornering balance. Beyond handling, this bar is highly effective at keeping the chassis level and straight during high-load launches, making it an essential upgrade for both street performance and drag racing applications.

Unlike cold-bent alternatives, this sway bar is manufactured from 1" solid 4140 chromoly steel that is heat-treated and formed as a single piece. This specific manufacturing process ensures the bar maintains its shape and memory over years of hard use without sagging or losing its spring rate.

• Diameter: 1 inch (solid)
• Material: 4140 chromoly steel
• Construction: One-piece formed and heat-treated
• Installation: Direct replacement for OE rear sway bar
• MPN: 3034-R