Eaton Detroit Truetrac 28 Spline Limited Slip Differential — Fits 1970-1977 GM 8.5in Rear

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Eaton

Eaton engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Eaton lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Legendary Traction for GM Muscle Cars

Bring your classic GM muscle car into the modern era with the Eaton Detroit Truetrac. Specifically designed for the iconic GM 8.5-inch rear end, this differential is the ultimate upgrade for enthusiasts who want to put power to the pavement without the headaches of traditional clutch-style limited slips. Its helical gear design reacts instantly to torque changes, providing smooth and predictable power delivery in every gear.

Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 2.73 and Up
  • Rear End Type: GM 8.5in
  • Design: Maintenance-free helical gear system

The Detroit Truetrac is famous for its "set it and forget it" reliability. Because it relies on gears rather than friction plates, there is no need for special additives or frequent rebuilds. It provides a seamless transition between locked and unlocked states, ensuring that your vehicle remains stable during cornering while providing maximum traction during straight-line acceleration. Whether you are building a street-strip Camaro, a classic Chevelle, or an Oldsmobile Cutlass, this differential is the perfect foundation for your drivetrain. It handles high-horsepower applications with ease, making it a favorite among drag racers and street performance enthusiasts. Enhance your vehicle's capability and reliability with the high-performance parts available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1971-1973 Buick Centurion Base
1973-1975 Buick Century Luxus
1973-1977 Buick Century Base
1975-1979 Buick Century Custom
1975-1979 Buick Century Special
1976 Buick Century Indianapolis 500 Pace Car
1978-1981 Buick Century Sport
1978-1989 Buick Century Limited
1980-1981 Buick Century Base
1980-1981 Buick Century Estate
1982-1989 Buick Century Custom
1983-1986 Buick Century T-Type
1984 Buick Century Estate
1984 Buick Century Olympia Limited
1985-1989 Buick Century Estate Wagon
1971-1974 Buick Electra 225
1971-1974 Buick Electra 225 Custom
1973 Buick Electra Base
1974 Buick Electra 225 Limited
1975 Buick Electra Custom
1975-1989 Buick Electra Limited
1976-1979 Buick Electra 225
1978-1989 Buick Electra Park Avenue
1980-1989 Buick Electra Estate Wagon
1985-1989 Buick Electra T-Type
1989 Buick Electra Park Avenue Ultra
1971-1983 Buick Estate Wagon Base
1971-1972 Buick GS Base
1971-1972 Buick GS 455 Base
1971-1973 Buick LeSabre Custom
1971-1981 Buick LeSabre Base
1974 Buick LeSabre Luxus
1975-1978 Buick LeSabre Custom
1977 Buick LeSabre Custom Sport
1978-1981 Buick LeSabre Sport
1979-1989 Buick LeSabre Limited
1982 Buick LeSabre Limited Edition F/E
1982-1989 Buick LeSabre Custom
1985 Buick LeSabre Collector's Edition
1985-1989 Buick LeSabre Estate Wagon
1987 Buick LeSabre T-Type
1987-1989 Buick LeSabre Base
1976-1979 Buick Opel Base
1977-1979 Buick Opel Deluxe
1978-1979 Buick Opel Sport
1988-1989 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1989 Buick Regal Limited
1982 Buick Regal Limited Turbo
1982-1983 Buick Regal Estate Wagon
1983-1986 Buick Regal T-Type
1984-1987 Buick Regal Grand National
1987 Buick Regal GNX
1988-1989 Buick Regal Custom
1989 Buick Regal Gran Sport
1971 Buick Riviera Gran Sport

…and 286 additional fitments. Contact us to confirm yours.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Eaton

Eaton engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Eaton lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Legendary Traction for GM Muscle Cars

Bring your classic GM muscle car into the modern era with the Eaton Detroit Truetrac. Specifically designed for the iconic GM 8.5-inch rear end, this differential is the ultimate upgrade for enthusiasts who want to put power to the pavement without the headaches of traditional clutch-style limited slips. Its helical gear design reacts instantly to torque changes, providing smooth and predictable power delivery in every gear.

Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 2.73 and Up
  • Rear End Type: GM 8.5in
  • Design: Maintenance-free helical gear system

The Detroit Truetrac is famous for its "set it and forget it" reliability. Because it relies on gears rather than friction plates, there is no need for special additives or frequent rebuilds. It provides a seamless transition between locked and unlocked states, ensuring that your vehicle remains stable during cornering while providing maximum traction during straight-line acceleration. Whether you are building a street-strip Camaro, a classic Chevelle, or an Oldsmobile Cutlass, this differential is the perfect foundation for your drivetrain. It handles high-horsepower applications with ease, making it a favorite among drag racers and street performance enthusiasts. Enhance your vehicle's capability and reliability with the high-performance parts available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1971-1973 Buick Centurion Base
1973-1975 Buick Century Luxus
1973-1977 Buick Century Base
1975-1979 Buick Century Custom
1975-1979 Buick Century Special
1976 Buick Century Indianapolis 500 Pace Car
1978-1981 Buick Century Sport
1978-1989 Buick Century Limited
1980-1981 Buick Century Base
1980-1981 Buick Century Estate
1982-1989 Buick Century Custom
1983-1986 Buick Century T-Type
1984 Buick Century Estate
1984 Buick Century Olympia Limited
1985-1989 Buick Century Estate Wagon
1971-1974 Buick Electra 225
1971-1974 Buick Electra 225 Custom
1973 Buick Electra Base
1974 Buick Electra 225 Limited
1975 Buick Electra Custom
1975-1989 Buick Electra Limited
1976-1979 Buick Electra 225
1978-1989 Buick Electra Park Avenue
1980-1989 Buick Electra Estate Wagon
1985-1989 Buick Electra T-Type
1989 Buick Electra Park Avenue Ultra
1971-1983 Buick Estate Wagon Base
1971-1972 Buick GS Base
1971-1972 Buick GS 455 Base
1971-1973 Buick LeSabre Custom
1971-1981 Buick LeSabre Base
1974 Buick LeSabre Luxus
1975-1978 Buick LeSabre Custom
1977 Buick LeSabre Custom Sport
1978-1981 Buick LeSabre Sport
1979-1989 Buick LeSabre Limited
1982 Buick LeSabre Limited Edition F/E
1982-1989 Buick LeSabre Custom
1985 Buick LeSabre Collector's Edition
1985-1989 Buick LeSabre Estate Wagon
1987 Buick LeSabre T-Type
1987-1989 Buick LeSabre Base
1976-1979 Buick Opel Base
1977-1979 Buick Opel Deluxe
1978-1979 Buick Opel Sport
1988-1989 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1989 Buick Regal Limited
1982 Buick Regal Limited Turbo
1982-1983 Buick Regal Estate Wagon
1983-1986 Buick Regal T-Type
1984-1987 Buick Regal Grand National
1987 Buick Regal GNX
1988-1989 Buick Regal Custom
1989 Buick Regal Gran Sport
1971 Buick Riviera Gran Sport

…and 286 additional fitments. Contact us to confirm yours.

Product Details

Product Description

About Eaton

Eaton engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Eaton lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Legendary Traction for GM Muscle Cars

Bring your classic GM muscle car into the modern era with the Eaton Detroit Truetrac. Specifically designed for the iconic GM 8.5-inch rear end, this differential is the ultimate upgrade for enthusiasts who want to put power to the pavement without the headaches of traditional clutch-style limited slips. Its helical gear design reacts instantly to torque changes, providing smooth and predictable power delivery in every gear.

Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 2.73 and Up
  • Rear End Type: GM 8.5in
  • Design: Maintenance-free helical gear system

The Detroit Truetrac is famous for its "set it and forget it" reliability. Because it relies on gears rather than friction plates, there is no need for special additives or frequent rebuilds. It provides a seamless transition between locked and unlocked states, ensuring that your vehicle remains stable during cornering while providing maximum traction during straight-line acceleration. Whether you are building a street-strip Camaro, a classic Chevelle, or an Oldsmobile Cutlass, this differential is the perfect foundation for your drivetrain. It handles high-horsepower applications with ease, making it a favorite among drag racers and street performance enthusiasts. Enhance your vehicle's capability and reliability with the high-performance parts available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1971-1973 Buick Centurion Base
1973-1975 Buick Century Luxus
1973-1977 Buick Century Base
1975-1979 Buick Century Custom
1975-1979 Buick Century Special
1976 Buick Century Indianapolis 500 Pace Car
1978-1981 Buick Century Sport
1978-1989 Buick Century Limited
1980-1981 Buick Century Base
1980-1981 Buick Century Estate
1982-1989 Buick Century Custom
1983-1986 Buick Century T-Type
1984 Buick Century Estate
1984 Buick Century Olympia Limited
1985-1989 Buick Century Estate Wagon
1971-1974 Buick Electra 225
1971-1974 Buick Electra 225 Custom
1973 Buick Electra Base
1974 Buick Electra 225 Limited
1975 Buick Electra Custom
1975-1989 Buick Electra Limited
1976-1979 Buick Electra 225
1978-1989 Buick Electra Park Avenue
1980-1989 Buick Electra Estate Wagon
1985-1989 Buick Electra T-Type
1989 Buick Electra Park Avenue Ultra
1971-1983 Buick Estate Wagon Base
1971-1972 Buick GS Base
1971-1972 Buick GS 455 Base
1971-1973 Buick LeSabre Custom
1971-1981 Buick LeSabre Base
1974 Buick LeSabre Luxus
1975-1978 Buick LeSabre Custom
1977 Buick LeSabre Custom Sport
1978-1981 Buick LeSabre Sport
1979-1989 Buick LeSabre Limited
1982 Buick LeSabre Limited Edition F/E
1982-1989 Buick LeSabre Custom
1985 Buick LeSabre Collector's Edition
1985-1989 Buick LeSabre Estate Wagon
1987 Buick LeSabre T-Type
1987-1989 Buick LeSabre Base
1976-1979 Buick Opel Base
1977-1979 Buick Opel Deluxe
1978-1979 Buick Opel Sport
1988-1989 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1989 Buick Regal Limited
1982 Buick Regal Limited Turbo
1982-1983 Buick Regal Estate Wagon
1983-1986 Buick Regal T-Type
1984-1987 Buick Regal Grand National
1987 Buick Regal GNX
1988-1989 Buick Regal Custom
1989 Buick Regal Gran Sport
1971 Buick Riviera Gran Sport

…and 286 additional fitments. Contact us to confirm yours.

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