UMI Performance Front Brake Conversion Hubs & Bearings (1978-1988 GM G-Body) (3047)
Upgrade your vintage braking system to modern Corvette stopping performance with UMI Performance Front Brake Conversion Hubs & Bearings (3047). Engineered specifically for 1978-1988 GM G-Body platforms—including the Buick Grand National/Regal, Chevrolet Monte Carlo, El Camino, Oldsmobile Cutlass, and Pontiac Grand Prix—this high-performance aluminum hub kit works in conjunction with UMI C5 conversion brackets (P/N 3046) to mount Corvette C5 or C6 front brake rotors directly onto factory G-Body spindles without altering front wheel track width.
Precision CNC-machined in Philipsburg, PA, USA from billet aluminum, these lightweight hubs feature dual bolt patterns ($5 \times 4.5\text{"}$ and $5 \times 4.75\text{"}$) to accommodate standard GM or Ford/aftermarket wheel configurations. The complete kit includes driver and passenger side aluminum hubs, premium bearing cups and cones, and heavy-duty rawhide grease seals engineered to withstand severe autocross and track abuse. Designed and proven on UMI’s famous "Green Machine" test car, this kit provides a rock-solid foundation for massive stopping power. Please note that wheel studs are sold separately, requiring standard 1/2"-20 press-in or screw-in wheel studs based on your specific wheel, spacer, and flange requirements.
Features
- Precision CNC-machined billet aluminum front hubs designed for Corvette C5/C6 brake conversions
- Compatible with UMI P/N 3046 C5 brake conversion bracket kit
- Mounts C5 brake rotors in exact OEM location without changing front suspension track width
- Dual bolt pattern design supports both $5 \times 4.75\text{"}$ (GM) and $5 \times 4.5\text{"}$ (Ford/Aftermarket) wheel setups
- Includes driver and passenger side hubs, premium bearing cups, tapered roller bearing cones, and rawhide seals
- Track-proven durability tested in high-G road race and autocross competition
- Requires 1/2"-20 threaded wheel studs (not included, length determined by wheel design/spacers)
- 100% designed, manufactured, and tested in Philipsburg, PA – USA
Specifications
- SKU: 3047
- Manufacturer: UMI Performance
- Country of Origin: USA (Philipsburg, PA)
- Material: High-Strength Billet Aluminum
- Hub Bolt Patterns: Dual $5 \times 4.75\text{"}$ & $5 \times 4.5\text{"}$
- Finish: Natural Machine Finish
- Bearings & Seals: Included (Cups, Cones, & Rawhide Seals)
- Wheel Studs: Not Included (Requires 1/2"-20 Studs)
- Weight: N/A
- Dimensions: N/A
- Unit of Measure: Pair (Set - Driver & Passenger Side)
- Modification Required: Requires UMI P/N 3046 Brackets & Modified Spindles
Fitment Notes
- Position: Front Brake Hubs.
- Fits 1978-1988 GM G-Body platforms (Buick Regal/Grand National, Chevrolet Monte Carlo, El Camino, Malibu, Oldsmobile Cutlass, Pontiac Grand Prix, Bonneville, GMC Caballero).
- Designed specifically to be used in conjunction with UMI C5 Conversion Brackets (P/N 3046).
- Requires 1/2"-20 wheel studs (length varies depending on chosen wheel flange thickness and wheel spacer usage).
- Wheel Clearance Requirements: C5 brake conversions require a minimum 17" wheel diameter; C6 brake conversions require a minimum 18" wheel diameter.
Fitment
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
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
1978 Oldsmobile Cutlass
1979 Oldsmobile Cutlass
1980 Oldsmobile Cutlass
1981 Oldsmobile Cutlass
1982 Oldsmobile Cutlass
1983 Oldsmobile Cutlass
1984 Oldsmobile Cutlass
1985 Oldsmobile Cutlass
1986 Oldsmobile Cutlass
1987 Oldsmobile Cutlass
1988 Oldsmobile Cutlass
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
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