Eaton Detroit Truetrac Differential 30-Spline — Fits Rear 8.5in/8.6in

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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

Eaton Detroit Truetrac Limited-Slip Differential: Superior Traction for GM Rear Axles

Upgrade your vehicle's traction capabilities with the Eaton Detroit Truetrac, a high-performance helical-gear limited-slip differential. Designed for GM rear axles measuring 8.5 or 8.6 inches, this differential provides seamless, automatic torque distribution to the wheel with the most grip. The Truetrac is the ultimate solution for drivers seeking improved performance in adverse conditions, enhanced acceleration, and increased confidence on challenging roads or trails, all without the drawbacks of traditional clutch-based limited-slip units.

Key Features and Benefits:

  • Advanced Helical-Gear Design: Utilizes a unique gear system to automatically bias torque to the wheel with better traction, ensuring optimal grip.
  • Smooth & Quiet Operation: Delivers consistent performance without the chatter or harsh engagement associated with some other LSDs.
  • Maintenance-Free: Requires no special fluids or additives, offering a durable and reliable performance upgrade with minimal upkeep.
  • On-Demand Traction: Automatically engages when wheel slip is detected, providing instant improvement in traction for acceleration and stability.
  • Versatile Fitment: Specifically engineered for GM 8.5-inch and 8.6-inch rear axles, ensuring proper fitment and function.
  • Axle Specifications: Features a 30-spline count and accommodates axle shafts with a 1.32-inch diameter, suitable for 2.73 and numerically lower gear ratios.
  • Broad Vehicle Application: Compatible with a wide range of GM vehicles, including sedans, coupes, and SUVs, enhancing their performance potential.

The Eaton Detroit Truetrac is the ideal choice for drivers who want to improve their vehicle's handling and traction in various driving conditions. From everyday commuting in inclement weather to spirited driving and light off-roading, the Truetrac provides a significant performance advantage. Enhance your vehicle's drivetrain with the proven reliability and advanced technology of Eaton. Discover the difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-1996 Buick Century Custom
1991-1996 Buick Century Special
1996 Buick Century Limited
1991-1996 Buick Commercial Chassis Base
1988-1989 Buick Electra Estate Wagon
1988-1990 Buick Electra Limited
1988-1990 Buick Electra Park Avenue
1988-1990 Buick Electra T-Type
1989-1990 Buick Electra Park Avenue Ultra
1988-1990 Buick LeSabre Estate Wagon
1988-1991 Buick LeSabre Base
1988-1996 Buick LeSabre Custom
1988-1996 Buick LeSabre Limited
1991-1996 Buick Park Avenue Base
1991-1996 Buick Park Avenue Ultra
2004-2005 Buick Rainier CXL Plus
2004-2007 Buick Rainier CXL
1988-1991 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1996 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
1988-1996 Buick Regal Custom
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1975 Buick Riviera GS
1975-1978 Buick Riviera Base
1976 Buick Riviera Sport
1976 Buick Riviera SR
1978 Buick Riviera LXXV Anniversary Edition
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1996 Buick Riviera Base
1991-1995 Buick Roadmaster Estate Wagon
1992-1995 Buick Roadmaster Base
1992-1995 Buick Roadmaster Limited
1996 Buick Roadmaster Collector's Edition
1996 Buick Roadmaster Estate Wagon Collector's Edition
1996 Buick Roadmaster Limited Collector's Edition
1988-1989 Buick Skyhawk Custom
1988-1989 Buick Skyhawk SE
1970 Buick Skylark 350
1970-1972 Buick Skylark Base
1970-1972 Buick Skylark Custom
1972 Buick Skylark 350
1975-1977 Buick Skylark SR
1975-1979 Buick Skylark Base
1976-1979 Buick Skylark S
1978 Buick Skylark Sport
1978-1979 Buick Skylark Custom
1988-1989 Buick Skylark Limited

…and 282 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

Eaton Detroit Truetrac Limited-Slip Differential: Superior Traction for GM Rear Axles

Upgrade your vehicle's traction capabilities with the Eaton Detroit Truetrac, a high-performance helical-gear limited-slip differential. Designed for GM rear axles measuring 8.5 or 8.6 inches, this differential provides seamless, automatic torque distribution to the wheel with the most grip. The Truetrac is the ultimate solution for drivers seeking improved performance in adverse conditions, enhanced acceleration, and increased confidence on challenging roads or trails, all without the drawbacks of traditional clutch-based limited-slip units.

Key Features and Benefits:

  • Advanced Helical-Gear Design: Utilizes a unique gear system to automatically bias torque to the wheel with better traction, ensuring optimal grip.
  • Smooth & Quiet Operation: Delivers consistent performance without the chatter or harsh engagement associated with some other LSDs.
  • Maintenance-Free: Requires no special fluids or additives, offering a durable and reliable performance upgrade with minimal upkeep.
  • On-Demand Traction: Automatically engages when wheel slip is detected, providing instant improvement in traction for acceleration and stability.
  • Versatile Fitment: Specifically engineered for GM 8.5-inch and 8.6-inch rear axles, ensuring proper fitment and function.
  • Axle Specifications: Features a 30-spline count and accommodates axle shafts with a 1.32-inch diameter, suitable for 2.73 and numerically lower gear ratios.
  • Broad Vehicle Application: Compatible with a wide range of GM vehicles, including sedans, coupes, and SUVs, enhancing their performance potential.

The Eaton Detroit Truetrac is the ideal choice for drivers who want to improve their vehicle's handling and traction in various driving conditions. From everyday commuting in inclement weather to spirited driving and light off-roading, the Truetrac provides a significant performance advantage. Enhance your vehicle's drivetrain with the proven reliability and advanced technology of Eaton. Discover the difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-1996 Buick Century Custom
1991-1996 Buick Century Special
1996 Buick Century Limited
1991-1996 Buick Commercial Chassis Base
1988-1989 Buick Electra Estate Wagon
1988-1990 Buick Electra Limited
1988-1990 Buick Electra Park Avenue
1988-1990 Buick Electra T-Type
1989-1990 Buick Electra Park Avenue Ultra
1988-1990 Buick LeSabre Estate Wagon
1988-1991 Buick LeSabre Base
1988-1996 Buick LeSabre Custom
1988-1996 Buick LeSabre Limited
1991-1996 Buick Park Avenue Base
1991-1996 Buick Park Avenue Ultra
2004-2005 Buick Rainier CXL Plus
2004-2007 Buick Rainier CXL
1988-1991 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1996 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
1988-1996 Buick Regal Custom
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1975 Buick Riviera GS
1975-1978 Buick Riviera Base
1976 Buick Riviera Sport
1976 Buick Riviera SR
1978 Buick Riviera LXXV Anniversary Edition
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1996 Buick Riviera Base
1991-1995 Buick Roadmaster Estate Wagon
1992-1995 Buick Roadmaster Base
1992-1995 Buick Roadmaster Limited
1996 Buick Roadmaster Collector's Edition
1996 Buick Roadmaster Estate Wagon Collector's Edition
1996 Buick Roadmaster Limited Collector's Edition
1988-1989 Buick Skyhawk Custom
1988-1989 Buick Skyhawk SE
1970 Buick Skylark 350
1970-1972 Buick Skylark Base
1970-1972 Buick Skylark Custom
1972 Buick Skylark 350
1975-1977 Buick Skylark SR
1975-1979 Buick Skylark Base
1976-1979 Buick Skylark S
1978 Buick Skylark Sport
1978-1979 Buick Skylark Custom
1988-1989 Buick Skylark Limited

…and 282 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

Eaton Detroit Truetrac Limited-Slip Differential: Superior Traction for GM Rear Axles

Upgrade your vehicle's traction capabilities with the Eaton Detroit Truetrac, a high-performance helical-gear limited-slip differential. Designed for GM rear axles measuring 8.5 or 8.6 inches, this differential provides seamless, automatic torque distribution to the wheel with the most grip. The Truetrac is the ultimate solution for drivers seeking improved performance in adverse conditions, enhanced acceleration, and increased confidence on challenging roads or trails, all without the drawbacks of traditional clutch-based limited-slip units.

Key Features and Benefits:

  • Advanced Helical-Gear Design: Utilizes a unique gear system to automatically bias torque to the wheel with better traction, ensuring optimal grip.
  • Smooth & Quiet Operation: Delivers consistent performance without the chatter or harsh engagement associated with some other LSDs.
  • Maintenance-Free: Requires no special fluids or additives, offering a durable and reliable performance upgrade with minimal upkeep.
  • On-Demand Traction: Automatically engages when wheel slip is detected, providing instant improvement in traction for acceleration and stability.
  • Versatile Fitment: Specifically engineered for GM 8.5-inch and 8.6-inch rear axles, ensuring proper fitment and function.
  • Axle Specifications: Features a 30-spline count and accommodates axle shafts with a 1.32-inch diameter, suitable for 2.73 and numerically lower gear ratios.
  • Broad Vehicle Application: Compatible with a wide range of GM vehicles, including sedans, coupes, and SUVs, enhancing their performance potential.

The Eaton Detroit Truetrac is the ideal choice for drivers who want to improve their vehicle's handling and traction in various driving conditions. From everyday commuting in inclement weather to spirited driving and light off-roading, the Truetrac provides a significant performance advantage. Enhance your vehicle's drivetrain with the proven reliability and advanced technology of Eaton. Discover the difference at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1973-1975 Buick Apollo Base
1975 Buick Apollo SR
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-1996 Buick Century Custom
1991-1996 Buick Century Special
1996 Buick Century Limited
1991-1996 Buick Commercial Chassis Base
1988-1989 Buick Electra Estate Wagon
1988-1990 Buick Electra Limited
1988-1990 Buick Electra Park Avenue
1988-1990 Buick Electra T-Type
1989-1990 Buick Electra Park Avenue Ultra
1988-1990 Buick LeSabre Estate Wagon
1988-1991 Buick LeSabre Base
1988-1996 Buick LeSabre Custom
1988-1996 Buick LeSabre Limited
1991-1996 Buick Park Avenue Base
1991-1996 Buick Park Avenue Ultra
2004-2005 Buick Rainier CXL Plus
2004-2007 Buick Rainier CXL
1988-1991 Buick Reatta Base
1973-1987 Buick Regal Base
1976-1977 Buick Regal SR
1978-1982 Buick Regal Sport
1978-1996 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
1988-1996 Buick Regal Custom
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1975 Buick Riviera GS
1975-1978 Buick Riviera Base
1976 Buick Riviera Sport
1976 Buick Riviera SR
1978 Buick Riviera LXXV Anniversary Edition
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1996 Buick Riviera Base
1991-1995 Buick Roadmaster Estate Wagon
1992-1995 Buick Roadmaster Base
1992-1995 Buick Roadmaster Limited
1996 Buick Roadmaster Collector's Edition
1996 Buick Roadmaster Estate Wagon Collector's Edition
1996 Buick Roadmaster Limited Collector's Edition
1988-1989 Buick Skyhawk Custom
1988-1989 Buick Skyhawk SE
1970 Buick Skylark 350
1970-1972 Buick Skylark Base
1970-1972 Buick Skylark Custom
1972 Buick Skylark 350
1975-1977 Buick Skylark SR
1975-1979 Buick Skylark Base
1976-1979 Buick Skylark S
1978 Buick Skylark Sport
1978-1979 Buick Skylark Custom
1988-1989 Buick Skylark Limited

…and 282 additional fitments. Contact us to confirm yours.

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