Product Description:
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Hawks Motorsports is proud to offer our clients this : 1964-1977 GM A-Body Rear Lower Control Arm Grade 8 Bolt and Lock Nut Hardware Kit from UMI Performance.
UMI Performance #4001 provides new high-strength fasteners for installing a pair of compatible rear lower control arms on classic GM A-body vehicles.
The kit contains four 1/2-inch SAE Grade 8 bolts, four flat washers, and four nylon-insert locking nuts. All supplied components feature a zinc coating that helps protect the hardware against corrosion while providing a clean, finished appearance.
Four bolts provide the frame-side and rear-axle-side mounting hardware required for both the driver- and passenger-side rear lower control arms. The kit can be used with compatible UMI Performance control arms, original-style replacement control arms, and control arms from other manufacturers that retain the correct 1/2-inch mounting dimensions.
UMI-4001 is suitable for restorations, rear suspension rebuilds, performance-street vehicles, Pro-Touring builds, drag-racing applications, autocross vehicles, and other projects where the original control-arm fasteners are worn, rusted, damaged, or missing.
Complete Kit Contents
- Four 1/2-inch SAE Grade 8 control-arm bolts
- Four 1/2-inch flat washers
- Four 1/2-inch nylon-insert locking nuts
- Zinc-coated finish on all supplied components
- Hardware for one pair of rear lower control arms
Important Package Information
One UMI-4001 kit installs one pair of rear lower control arms. It does not provide enough hardware to install both the upper and lower rear control arms.
UMI #4002 is the corresponding eight-bolt kit for applications requiring mounting hardware for both the upper and lower rear control arms.
Rear control arms, bushings, rear-end housing bushings, frame braces, sway bars, and other suspension components are not included with UMI-4001.
Front Lower A-Arm Compatibility
UMI-4001 may also be used as the front lower A-arm mounting kit on compatible 1964-1972 GM A-body applications using 1/2-inch pivot bolts.
It is not the correct front lower A-arm hardware kit for 1973-1977 A-body models. UMI catalogs #1003, which uses metric M14 fasteners, for the front lower A-arms on those vehicles.
4. KEY FEATURES
- Designed for 1964-1977 GM A-body applications
- Primary application is the rear lower control arms
- Supplies hardware for both rear lower control arms
- Includes four 1/2-inch SAE Grade 8 bolts
- Includes four matching flat washers
- Includes four nylon-insert locking nuts
- Nylon inserts help resist loosening caused by normal vibration
- Zinc-coated finish
- Zinc coating helps protect against corrosion
- Replaces worn, rusted, damaged, or missing original fasteners
- Compatible with applicable UMI Performance rear lower control arms
- Compatible with applicable factory-style rear lower control arms
- Compatible with many aftermarket control arms using the same mounting dimensions
- Provides hardware for the frame-side and axle-side mounting points
- Suitable for fixed or adjustable lower control arms using compatible bushings and sleeves
- Suitable for rubber, polyurethane, Roto-Joint, or bearing-equipped arms when approved by the control-arm manufacturer
- Suitable for restoration projects
- Suitable for performance-street vehicles
- Suitable for Pro-Touring applications
- Suitable for drag-racing vehicles
- Suitable for autocross and road-course builds
- Direct bolt-on configuration for verified applications
- Also compatible with applicable 1964-1972 A-body front lower A-arms
- Not the correct front lower A-arm hardware for 1973-1977 A-body models
- UMI #1003 is used for applicable 1973-1977 A-body front lower A-arms
- One kit installs one pair of lower control arms
- UMI #4002 is available for upper-and-lower rear control-arm installations
- UMI Performance part #4001
- Hawks Motorsports part #UMI-4001
5. MODEL INTERCHANGE AND FITMENT
UMI Performance catalogs #4001 for 1964-1977 GM A-body vehicles. The primary application covered by this listing is the pair of rear lower control arms.
Fitment is based on the vehicle platform and mounting dimensions rather than engine size or trim level.
1964-1972 GM A-Body Applications
Buick
- 1964-1969 Buick Special
- 1964-1972 Buick Skylark
- 1964-1972 Buick Sport Wagon
- 1965-1967 Buick Gran Sport
- 1968-1969 Buick GS 350
- 1968-1969 Buick GS 400
- 1970-1972 Buick GS
- 1970-1972 Buick GS 455
Chevrolet
- 1964-1972 Chevrolet Chevelle
- 1964-1972 Chevrolet Malibu
- 1964-1972 Chevrolet El Camino
- 1970-1972 Chevrolet Monte Carlo
Includes applicable Chevelle 300, 300 Deluxe, Malibu, Concours, Nomad, Super Sport, and SS 396/454 models retaining the compatible A-body rear suspension.
Oldsmobile
- 1964-1972 Oldsmobile F-85
- 1964-1972 Oldsmobile Cutlass
- 1964-1972 Oldsmobile Cutlass Supreme
- 1964-1972 Oldsmobile 4-4-2
- 1964-1972 Oldsmobile Vista Cruiser
Pontiac
- 1964-1970 Pontiac Tempest
- 1964-1972 Pontiac LeMans
- 1964-1972 Pontiac GTO
- 1969-1972 Pontiac Grand Prix
GMC
- 1971-1972 GMC Sprint
1973-1977 GM A-Body Applications
Buick
- 1973-1977 Buick Century
- 1973-1977 Buick Regal
Includes applicable Century, Century Luxus, Century Special, Century Custom, and Regal models retaining the original A-body rear control-arm arrangement.
Chevrolet
- 1973-1977 Chevrolet Chevelle
- 1973-1977 Chevrolet Malibu
- 1973-1977 Chevrolet El Camino
- 1973-1976 Chevrolet Laguna
- 1970-1977 Chevrolet Monte Carlo
Includes applicable Malibu, Malibu Classic, Laguna, Laguna S-3, El Camino, and Monte Carlo models.
Oldsmobile
- 1973-1977 Oldsmobile Cutlass
- 1973-1977 Oldsmobile Cutlass S
- 1973-1977 Oldsmobile Cutlass Supreme
- Applicable 1973-1977 Cutlass-based 4-4-2 and Vista Cruiser models
Pontiac
- 1973-1977 Pontiac LeMans
- 1973 Pontiac GTO
- 1973-1975 Pontiac Grand Am
- 1977 Pontiac Can Am
The 1974 Pontiac GTO used the compact X-body platform and should not be identified as a 1974 A-body GTO application.
Important Fitment Notes
- Designed for compatible 1964-1977 GM A-body rear lower control arms.
- One kit supplies the four pivot fasteners required for one pair of rear lower control arms.
- The supplied bolts are 1/2-inch SAE Grade 8 fasteners.
- Confirm the control-arm bushing sleeves and chassis mounting holes accept 1/2-inch bolts.
- Compatible with applicable factory and aftermarket rear lower control arms.
- Verify compatibility when using custom-fabricated arms, modified mounting brackets, or non-original rear axle assemblies.
- Inspect all frame and axle mounting points for rust, cracks, distortion, or elongated holes.
- Damaged control-arm mounting locations must be properly repaired before installation.
- This kit does not include hardware for the rear upper control arms.
- Use UMI #4002 when replacing the hardware for both upper and lower rear control arms.
- UMI-4001 may also fit compatible 1964-1972 A-body front lower A-arms.
- Do not use UMI-4001 for the front lower A-arms on 1973-1977 A-body models.
- UMI #1003 provides the M14 hardware used with applicable 1973-1977 A-body front lower A-arms.
- This listing does not cover 1978-1988 GM G-body applications.
6. INSTALLATION NOTES
- Read the control-arm manufacturer’s complete installation instructions before beginning work.
- Verify that the supplied 1/2-inch fasteners match the control arms, bushing sleeves, frame brackets, and axle brackets.
- Park the vehicle on a solid, level surface.
- Safely raise and support the vehicle with properly rated lifting equipment.
- Never work beneath a vehicle supported only by a hydraulic jack.
- Support the vehicle by the chassis while separately supporting the rear axle.
- The rear axle must remain controlled during control-arm removal.
- Replace one rear lower control arm at a time whenever possible.
- Leaving the opposite control arm installed helps maintain rear-axle position.
- Note the direction and orientation of the original bolts before removal.
- Inspect the frame-side and axle-side mounting brackets for cracks, corrosion, distortion, or elongated holes.
- Do not force a bolt through a misaligned control-arm bushing sleeve.
- Raise or lower the supported rear axle as necessary to align the mounting holes.
- Install the new bolts, washers, and nylon locking nuts loosely until both ends of the control arm are properly positioned.
- Make sure the bolt shanks pass completely through the mounting brackets and bushing sleeves.
- Verify full thread engagement through each nylon locking nut.
- Final tightening should be performed with the suspension positioned at normal ride height unless the control-arm manufacturer specifies another procedure.
- Tightening the pivot bolts with the rear suspension hanging may preload certain rubber or polyurethane bushings.
- Follow the torque specification supplied by the control-arm manufacturer or the appropriate vehicle service manual.
- UMI’s instructions for its #4015 rear lower control arms specify 72 ft-lb for the four pivot bolts in that particular installation.
- Do not treat 72 ft-lb as a universal specification for every factory or aftermarket control arm.
- Confirm that the rear axle moves through its intended range without binding.
- Check clearance around the exhaust, brake lines, parking-brake cables, shocks, driveshaft, sway bar, and surrounding chassis components.
- Reinspect the fasteners after the initial road test.
- Periodically inspect the control-arm bolts and mounting points as part of normal suspension maintenance.
