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UMI Performance 64-72 GM A-Body Rear Coilover Brackets Bolt In (175LB Spring Rate) is UMI Performance manufacturer part number 4057-175, selected by the verified year, make, and model applications below. UMI’s rear coilover kit allows for ride height adjustments ranging from a -2" to -3" drop, along with spring rate and damping modifications. The kit includes a reinforced upper mount that bolts directly in place (requiring one additional hole to be drilled) and accommodates a true 2-1/2” racing coilover with a double-shear mount. It also features FEA-designed reinforced lower brackets that bolt directly over the stock rear lower control arm mounts and utilize the existing lower shock hole(s). The 2-hole trailing arm height adjustment enables fine-tuning of the instant center location for drag launches or auto-x/road race rear steer tuning. The Viking Performance shock offers 19-way adjustments for both compression and rebound. The 2-1/2” coilover springs come in various rates suitable for
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 1970-1972 | Buick | GS | Confirm every UMI Performance application note and factory configuration |
| 1968-1969 | Buick | GS 350 | Confirm every UMI Performance application note and factory configuration |
| 1968-1969 | Buick | GS 400 | Confirm every UMI Performance application note and factory configuration |
| 1970-1972 | Buick | GS 455 | Confirm every UMI Performance application note and factory configuration |
| 1965-1967 | Buick | Gran Sport | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Buick | Skylark | Confirm every UMI Performance application note and factory configuration |
| 1964-1969 | Buick | Special | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Buick | Sportwagon | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Chevrolet | Chevelle | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Chevrolet | El Camino | Confirm every UMI Performance application note and factory configuration |
| 1964-1967 | Chevrolet | Malibu | Confirm every UMI Performance application note and factory configuration |
| 1970-1972 | Chevrolet | Monte Carlo | Confirm every UMI Performance application note and factory configuration |
| 1971-1972 | GMC | Sprint | Confirm every UMI Performance application note and factory configuration |
| 1964-1971 | Oldsmobile | 442 | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Oldsmobile | Cutlass | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Oldsmobile | Vista Cruiser | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Pontiac | GTO | Confirm every UMI Performance application note and factory configuration |
| 1969-1972 | Pontiac | Grand Prix | Confirm every UMI Performance application note and factory configuration |
| 1964-1972 | Pontiac | LeMans | Confirm every UMI Performance application note and factory configuration |
| 1964-1970 | Pontiac | Tempest | Confirm every UMI Performance application note and factory configuration |
Specifications
| Brand | UMI Performance |
|---|---|
| Manufacturer Part Number | 4057-175 |
| Product Type | Coilovers |
| Application Type | Vehicle Specific |
| Condition | New |
What's Included
One new UMI Performance coilovers package identified by manufacturer part number 4057-175, plus only the hardware and accessories expressly shown or stated for this exact part number
About UMI Performance
UMI Performance designs and manufactures suspension, chassis, steering, and handling components for American performance vehicles in Philipsburg, Pennsylvania.
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Frequently Asked Questions
How do I confirm UMI Performance 4057-175 is correct for my application?
Match the exact manufacturer part number, year, make, model, factory configuration, dimensions, connection points, and every current UMI Performance note.
Are similar UMI Performance parts interchangeable with 4057-175?
No. Mounting points, dimensions, adjustment range, material, finish, bushing style, and included hardware can differ between part numbers.
What should be checked after installing UMI Performance 4057-175?
Inspect fasteners, bushings, joints, clearances, alignment, ride height, and suspension movement after installation and again after the initial road test.
Installation
Follow the current UMI Performance instructions for manufacturer part number 4057-175. Confirm all torque values, mounting locations, bushings, joints, clearances, ride height, and alignment requirements. Professional installation and a post-installation alignment are recommended when the component changes suspension geometry.
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