This harmonic balancer and Belt Drive Pulley is a new, aftermarket replacement part that has the following specifications:

  • Type - Hollow Back
  • OE part number - GM 12551948
  • Diameter - 6-3/4" (inches)
  • Width - 2-3/8" (inches)
  • Direct bolt on replacement
  • Built to strict quality control standards

A direct replacement. Please verify the dimensions against your existing balancer.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

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Vehicle Fit

Year Make Model Description
1977Buick Century Buick Century Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977-1980Buick Century Buick Century Harmonic Balancer V8 5.0L 305ci
1978-1979Buick Century Buick Century Harmonic Balancer V8 5.7L 350ci
1978Buick Electra Buick Electra Harmonic Balancer V8 5.0L 305ci
1978Buick LeSabre Buick LeSabre Harmonic Balancer V8 5.0L 305ci
1977Buick Regal Buick Regal Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977Buick Regal Buick Regal Harmonic Balancer V8 5.0L 305ci
1978-1980Buick Regal Buick Regal Harmonic Balancer V8 5.0L 305ci
1991Buick Roadmaster Buick Roadmaster Harmonic Balancer V8 5.0L 305ci
1992-1993Buick Roadmaster Buick Roadmaster Harmonic Balancer V8 5.7L 350ci
1977-1979Buick Skylark Buick Skylark Harmonic Balancer V8 5.0L 305ci
1977Buick Skylark Buick Skylark Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1978-1979Buick Skylark Buick Skylark Harmonic Balancer V8 5.7L 350ci
1990-1992Cadillac Brougham Cadillac Brougham Harmonic Balancer V8 5.7L
1991-1992Cadillac Brougham Cadillac Brougham Harmonic Balancer V8 5.0L
1990-1993Cadillac Fleetwood Cadillac Fleetwood Harmonic Balancer V8 5.7L
1991-1992Cadillac Fleetwood Cadillac Fleetwood Harmonic Balancer V8 5.0L
1979-1987Chevy Blazer Full Size Chevy Blazer Full Size Harmonic Balancer V8 5.0L 305ci
1977-1986Chevy C10 Truck Chevy C10 Truck Harmonic Balancer V8 5.0L 305ci
1977-1986Chevy C20 Truck Chevy C20 Truck Harmonic Balancer V8 5.0L 305ci
1977-1984Chevy Camaro Chevy Camaro Harmonic Balancer V8 5.0L 305ci
1977-1981Chevy Camaro Chevy Camaro Harmonic Balancer V8 5.7L 350ci
1985-1987Chevy Camaro Chevy Camaro Harmonic Balancer V8 5.0L 305ci with 4 BBL Carburetor
1988-1992Chevy Camaro Chevy Camaro Harmonic Balancer V8 5.0L 305ci with Throttle Body Injection (TBI)
1980-1993Chevy Caprice Chevy Caprice Harmonic Balancer V8 5.0L 305ci
1980-1985Chevy Caprice Chevy Caprice Harmonic Balancer V8 5.7L 350ci (excluding Diesel Engines)
1986-1996Chevy Caprice Chevy Caprice Harmonic Balancer V8 5.7L 350ci
1977Chevy Chevelle Chevy Chevelle Harmonic Balancer V8 5.0L 305ci
1977Chevy Chevelle Chevy Chevelle Harmonic Balancer V8 5.7L 350ci
1977-1979Chevy El Camino Chevy El Camino Harmonic Balancer V8 5.7L 350ci
1977-1987Chevy El Camino Chevy El Camino Harmonic Balancer V8 5.0L 305ci
1980-1985Chevy Impala Chevy Impala Harmonic Balancer V8 5.7L 350ci (excluding Diesel Engines)
1980-1985Chevy Impala Chevy Impala Harmonic Balancer V8 5.0L 305ci
1978-1983Chevy Malibu Chevy Malibu Harmonic Balancer V8 5.0L 305ci
1978-1979Chevy Malibu Chevy Malibu Harmonic Balancer V8 5.7L 350ci
1977Chevy Monte Carlo Chevy Monte Carlo Harmonic Balancer V8 5.0L 305ci
1978-1988Chevy Monte Carlo Chevy Monte Carlo Harmonic Balancer V8 5.0L 305ci
1977-1979Chevy Nova Chevy Nova Harmonic Balancer V8 5.7L 350ci
1977-1979Chevy Nova Chevy Nova Harmonic Balancer V8 5.0L 305ci
1979Chevy Suburban C10 Chevy Suburban C10 Harmonic Balancer V8 5.0L 305ci
1981-1986Chevy Suburban C10 Chevy Suburban C10 Harmonic Balancer V8 5.0L 305ci
1979Chevy Suburban C20 Chevy Suburban C20 Harmonic Balancer V8 5.0L 305ci
1981-1986Chevy Suburban C20 Chevy Suburban C20 Harmonic Balancer V8 5.0L 305ci
1979Chevy Suburban K10 Chevy Suburban K10 Harmonic Balancer V8 5.0L 305ci
1981-1986Chevy Suburban K10 Chevy Suburban K10 Harmonic Balancer V8 5.0L 305ci
1979Chevy Suburban K20 Chevy Suburban K20 Harmonic Balancer V8 5.0L 305ci
1981-1986Chevy Suburban K20 Chevy Suburban K20 Harmonic Balancer V8 5.0L 305ci
1977-1986GMC C1500 Truck GMC C1500 Truck Harmonic Balancer V8 5.0L 305ci
1977-1986GMC C2500 Truck GMC C2500 Truck Harmonic Balancer V8 5.0L 305ci
1978-1987GMC Caballero GMC Caballero Harmonic Balancer V8 5.0L 305ci
1978-1979GMC Caballero GMC Caballero Harmonic Balancer V8 5.7L 350ci
1979-1987GMC Jimmy Full Size GMC Jimmy Full Size Harmonic Balancer V8 5.0L 305ci
1977GMC Sprint GMC Sprint Harmonic Balancer V8 5.0L 305ci
1977GMC Sprint GMC Sprint Harmonic Balancer V8 5.7L 350ci
1979GMC Suburban C1500 GMC Suburban C1500 Harmonic Balancer V8 5.0L 305ci
1981-1986GMC Suburban C1500 GMC Suburban C1500 Harmonic Balancer V8 5.0L 305ci
1979GMC Suburban K1500 GMC Suburban K1500 Harmonic Balancer V8 5.0L 305ci
1981-1986GMC Suburban K1500 GMC Suburban K1500 Harmonic Balancer V8 5.0L 305ci
1987GMC Suburban R1500 GMC Suburban R1500 Harmonic Balancer V8 5.0L 305ci
1987GMC Suburban V1500 GMC Suburban V1500 Harmonic Balancer V8 5.0L 305ci
1977Oldsmobile 98-Regency Olds 98-Regency Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1991-1992Oldsmobile Custom Cruiser Olds Custom Cruiser Wagon Harmonic Balancer V8 5.0L
1992Oldsmobile Custom Cruiser Olds Custom Cruiser Wagon Harmonic Balancer V8 5.7L
1978-1987Oldsmobile Cutlass Olds Cutlass Harmonic Balancer V8 5.0L 305ci
1978Oldsmobile Cutlass Olds Cutlass Harmonic Balancer V8 5.7L 350ci
1979Oldsmobile Cutlass Olds Cutlass Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1978Oldsmobile Cutlass Supreme RWD Olds Cutlass Supreme RWD Harmonic Balancer V8 5.7L 350ci
1978-1987Oldsmobile Cutlass Supreme RWD Olds Cutlass Supreme RWD Harmonic Balancer V8 5.0L 305ci
1979Oldsmobile Cutlass Supreme RWD Olds Cutlass Supreme RWD Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977Oldsmobile Delta 88 Olds Delta 88 Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977Oldsmobile Delta 88-Royale Olds Delta 88-Royale Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977-1979Oldsmobile Omega Olds Omega Harmonic Balancer V8 5.0L 305ci
1977Oldsmobile Omega Olds Omega Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1978-1979Oldsmobile Omega Olds Omega Harmonic Balancer V8 5.7L 350ci
1977Oldsmobile Regency Olds Regency Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977Oldsmobile Vista Cruiser Olds Vista Cruiser Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1977Pontiac Bonneville Pontiac Bonneville Harmonic Balancer V8 5.0L 305ci
1981Pontiac Bonneville Pontiac Bonneville Harmonic Balancer V8 5.0L 305ci
1983-1986Pontiac Bonneville Pontiac Bonneville Harmonic Balancer V8 5.0L 305ci
1977-1984Pontiac Firebird Pontiac Firebird Harmonic Balancer V8 5.0L 305ci
1977-1981Pontiac Firebird Pontiac Firebird Harmonic Balancer V8 5.7L 350ci
1985-1987Pontiac Firebird Pontiac Firebird Harmonic Balancer V8 5.0L 305ci with 4 BBL Carburetor
1988-1992Pontiac Firebird Pontiac Firebird Harmonic Balancer V8 5.0L 305ci with Throttle Body Injection (TBI)
1978-1980Pontiac Grand Prix Pontiac Grand Prix Harmonic Balancer V8 5.0L 305ci
1983-1987Pontiac Grand Prix Pontiac Grand Prix Harmonic Balancer V8 5.0L 305ci
1977-1979Pontiac LeMans Pontiac LeMans Harmonic Balancer V8 5.0L 305ci
1978Pontiac LeMans Pontiac LeMans Harmonic Balancer V8 5.7L 350ci
1977Pontiac Parisienne Pontiac Parisienne Harmonic Balancer V8 5.0L 305ci
1981Pontiac Parisienne Pontiac Parisienne Harmonic Balancer V8 5.0L 305ci
1983-1986Pontiac Parisienne Pontiac Parisienne Harmonic Balancer V8 5.0L 305ci
1977Pontiac Phoenix Pontiac Phoenix Harmonic Balancer V8 5.0L 305ci
1977Pontiac Phoenix Pontiac Phoenix Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)
1978-1979Pontiac Phoenix Pontiac Phoenix Harmonic Balancer V8 5.7L 350ci
1978-1979Pontiac Phoenix Pontiac Phoenix Harmonic Balancer V8 5.0L 305ci
1977Pontiac Ventura II Pontiac Ventura II Harmonic Balancer V8 5.0L 305ci
1977Pontiac Ventura II Pontiac Ventura II Harmonic Balancer V8 5.7L 350ci (8th Vin Digit L)

This part replaces:

  • Hollander 309-172
  • OE # 12551948
  • Dorman 594-009
Part #: 1AEHB00055


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout