Eaton Detroit Truetrac Differential 30 Spline 8.875in Ring Gear

SKU: EAT913A555
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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.

Maximize Traction with the Eaton Detroit Truetrac Differential

The Eaton Detroit Truetrac is a revolutionary helical-gear limited-slip differential engineered to significantly enhance your vehicle's traction and driving dynamics. Designed for smooth, maintenance-free operation, it automatically provides optimal power to the wheel with the most grip, whether you're accelerating, cornering, or navigating challenging terrain. Its versatility makes it the ultimate traction solution for a wide range of vehicles, from daily drivers to performance machines.

Unleash Superior Performance:

  • Helical Gear Technology: Utilizes robust helical gears for reliable and smooth limited-slip action.
  • Automatic Operation: Seamlessly transfers power to the wheel with traction, enhancing stability and control in all conditions.
  • Maintenance-Free Design: Enjoy worry-free performance with a differential that requires no special fluids or clutches.
  • Smooth Engagement: Provides predictable and smooth engagement, eliminating the harshness sometimes associated with other limited-slip units.
  • Versatile Application: Ideal for a broad spectrum of vehicles, including muscle cars, trucks, and off-road applications.
  • Durable Construction: Built with high-quality materials to withstand demanding driving conditions.

This specific Eaton Detroit Truetrac features 30 spline count, accommodates axles with a 1.29-inch diameter, and is designed for rear differentials with an 8.875-inch ring gear size. It's engineered to work with gear ratios ranging from 3.08 to 3.90, offering a wide compatibility window for various setups. Whether you're looking to improve off-the-line acceleration, enhance cornering grip, or simply gain more confidence on slippery surfaces, the Truetrac is the perfect upgrade.

Invest in superior traction and driving confidence with the Eaton Detroit Truetrac Differential. Find the perfect fit for your vehicle at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1972 Buick Centurion Base
1964-1967 Buick Electra Base
1966-1967 Buick Electra Custom
1968-1972 Buick Electra 225
1968-1972 Buick Electra 225 Custom
1964 Buick Estate Wagon Base
1970-1972 Buick Estate Wagon Base
1970-1972 Buick GS Base
1968-1969 Buick GS 350 Base
1968-1969 Buick GS 400 Base
1970 Buick GS 455 GSX
1970-1972 Buick GS 455 Base
1965-1967 Buick Gran Sport Base
1964-1972 Buick LeSabre Base
1965-1972 Buick LeSabre Custom
1964-1972 Buick Riviera Base
1965-1966 Buick Riviera Gran Sport
1971 Buick Riviera Gran Sport
1964-1972 Buick Skylark Base
1968-1972 Buick Skylark Custom
1970 Buick Skylark 350
1972 Buick Skylark 350
1964-1967 Buick Special Deluxe
1964-1969 Buick Special Base
1964-1972 Buick Sportwagon Base
1966 Buick Sportwagon Custom
1968-1969 Buick Sportwagon Custom
1964-1969 Buick Wildcat Base
1965 Buick Wildcat Deluxe
1965-1970 Buick Wildcat Custom
1966 Buick Wildcat Gran Sport
1964-1972 Chevrolet Bel Air Base
1964-1972 Chevrolet Biscayne Base
1969-1972 Chevrolet Brookwood Base
1967-1972 Chevrolet Camaro Base
1967-1972 Chevrolet Camaro RS
1967-1972 Chevrolet Camaro SS
1967-1972 Chevrolet Camaro Z28
1966-1972 Chevrolet Caprice Base
1964-1968 Chevrolet Chevelle Base
1964-1972 Chevrolet Chevelle SS
1965-1967 Chevrolet Chevelle Deluxe
1967-1968 Chevrolet Chevelle 300
1967-1969 Chevrolet Chevelle 300 Deluxe
1967-1972 Chevrolet Chevelle Concours
1968-1972 Chevrolet Chevelle Malibu
1968-1972 Chevrolet Chevelle Nomad
1969-1972 Chevrolet Chevelle Greenbrier
1969-1972 Chevrolet Chevelle Concours Estate
1970-1972 Chevrolet Chevelle Base
1964-1967 Chevrolet Chevy II Nova SS
1964-1967 Chevrolet Chevy II Base
1964-1968 Chevrolet Chevy II Nova
1964 Chevrolet Corvair Deluxe
1964 Chevrolet Corvair Monza Spyder
1964-1967 Chevrolet Corvair Base
1964-1969 Chevrolet Corvair Monza
1965-1966 Chevrolet Corvair Corsa
1968-1969 Chevrolet Corvair 500
1964-1972 Chevrolet Corvette Base

…and 85 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.

Maximize Traction with the Eaton Detroit Truetrac Differential

The Eaton Detroit Truetrac is a revolutionary helical-gear limited-slip differential engineered to significantly enhance your vehicle's traction and driving dynamics. Designed for smooth, maintenance-free operation, it automatically provides optimal power to the wheel with the most grip, whether you're accelerating, cornering, or navigating challenging terrain. Its versatility makes it the ultimate traction solution for a wide range of vehicles, from daily drivers to performance machines.

Unleash Superior Performance:

  • Helical Gear Technology: Utilizes robust helical gears for reliable and smooth limited-slip action.
  • Automatic Operation: Seamlessly transfers power to the wheel with traction, enhancing stability and control in all conditions.
  • Maintenance-Free Design: Enjoy worry-free performance with a differential that requires no special fluids or clutches.
  • Smooth Engagement: Provides predictable and smooth engagement, eliminating the harshness sometimes associated with other limited-slip units.
  • Versatile Application: Ideal for a broad spectrum of vehicles, including muscle cars, trucks, and off-road applications.
  • Durable Construction: Built with high-quality materials to withstand demanding driving conditions.

This specific Eaton Detroit Truetrac features 30 spline count, accommodates axles with a 1.29-inch diameter, and is designed for rear differentials with an 8.875-inch ring gear size. It's engineered to work with gear ratios ranging from 3.08 to 3.90, offering a wide compatibility window for various setups. Whether you're looking to improve off-the-line acceleration, enhance cornering grip, or simply gain more confidence on slippery surfaces, the Truetrac is the perfect upgrade.

Invest in superior traction and driving confidence with the Eaton Detroit Truetrac Differential. Find the perfect fit for your vehicle at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1972 Buick Centurion Base
1964-1967 Buick Electra Base
1966-1967 Buick Electra Custom
1968-1972 Buick Electra 225
1968-1972 Buick Electra 225 Custom
1964 Buick Estate Wagon Base
1970-1972 Buick Estate Wagon Base
1970-1972 Buick GS Base
1968-1969 Buick GS 350 Base
1968-1969 Buick GS 400 Base
1970 Buick GS 455 GSX
1970-1972 Buick GS 455 Base
1965-1967 Buick Gran Sport Base
1964-1972 Buick LeSabre Base
1965-1972 Buick LeSabre Custom
1964-1972 Buick Riviera Base
1965-1966 Buick Riviera Gran Sport
1971 Buick Riviera Gran Sport
1964-1972 Buick Skylark Base
1968-1972 Buick Skylark Custom
1970 Buick Skylark 350
1972 Buick Skylark 350
1964-1967 Buick Special Deluxe
1964-1969 Buick Special Base
1964-1972 Buick Sportwagon Base
1966 Buick Sportwagon Custom
1968-1969 Buick Sportwagon Custom
1964-1969 Buick Wildcat Base
1965 Buick Wildcat Deluxe
1965-1970 Buick Wildcat Custom
1966 Buick Wildcat Gran Sport
1964-1972 Chevrolet Bel Air Base
1964-1972 Chevrolet Biscayne Base
1969-1972 Chevrolet Brookwood Base
1967-1972 Chevrolet Camaro Base
1967-1972 Chevrolet Camaro RS
1967-1972 Chevrolet Camaro SS
1967-1972 Chevrolet Camaro Z28
1966-1972 Chevrolet Caprice Base
1964-1968 Chevrolet Chevelle Base
1964-1972 Chevrolet Chevelle SS
1965-1967 Chevrolet Chevelle Deluxe
1967-1968 Chevrolet Chevelle 300
1967-1969 Chevrolet Chevelle 300 Deluxe
1967-1972 Chevrolet Chevelle Concours
1968-1972 Chevrolet Chevelle Malibu
1968-1972 Chevrolet Chevelle Nomad
1969-1972 Chevrolet Chevelle Greenbrier
1969-1972 Chevrolet Chevelle Concours Estate
1970-1972 Chevrolet Chevelle Base
1964-1967 Chevrolet Chevy II Nova SS
1964-1967 Chevrolet Chevy II Base
1964-1968 Chevrolet Chevy II Nova
1964 Chevrolet Corvair Deluxe
1964 Chevrolet Corvair Monza Spyder
1964-1967 Chevrolet Corvair Base
1964-1969 Chevrolet Corvair Monza
1965-1966 Chevrolet Corvair Corsa
1968-1969 Chevrolet Corvair 500
1964-1972 Chevrolet Corvette Base

…and 85 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.

Maximize Traction with the Eaton Detroit Truetrac Differential

The Eaton Detroit Truetrac is a revolutionary helical-gear limited-slip differential engineered to significantly enhance your vehicle's traction and driving dynamics. Designed for smooth, maintenance-free operation, it automatically provides optimal power to the wheel with the most grip, whether you're accelerating, cornering, or navigating challenging terrain. Its versatility makes it the ultimate traction solution for a wide range of vehicles, from daily drivers to performance machines.

Unleash Superior Performance:

  • Helical Gear Technology: Utilizes robust helical gears for reliable and smooth limited-slip action.
  • Automatic Operation: Seamlessly transfers power to the wheel with traction, enhancing stability and control in all conditions.
  • Maintenance-Free Design: Enjoy worry-free performance with a differential that requires no special fluids or clutches.
  • Smooth Engagement: Provides predictable and smooth engagement, eliminating the harshness sometimes associated with other limited-slip units.
  • Versatile Application: Ideal for a broad spectrum of vehicles, including muscle cars, trucks, and off-road applications.
  • Durable Construction: Built with high-quality materials to withstand demanding driving conditions.

This specific Eaton Detroit Truetrac features 30 spline count, accommodates axles with a 1.29-inch diameter, and is designed for rear differentials with an 8.875-inch ring gear size. It's engineered to work with gear ratios ranging from 3.08 to 3.90, offering a wide compatibility window for various setups. Whether you're looking to improve off-the-line acceleration, enhance cornering grip, or simply gain more confidence on slippery surfaces, the Truetrac is the perfect upgrade.

Invest in superior traction and driving confidence with the Eaton Detroit Truetrac Differential. Find the perfect fit for your vehicle at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1972 Buick Centurion Base
1964-1967 Buick Electra Base
1966-1967 Buick Electra Custom
1968-1972 Buick Electra 225
1968-1972 Buick Electra 225 Custom
1964 Buick Estate Wagon Base
1970-1972 Buick Estate Wagon Base
1970-1972 Buick GS Base
1968-1969 Buick GS 350 Base
1968-1969 Buick GS 400 Base
1970 Buick GS 455 GSX
1970-1972 Buick GS 455 Base
1965-1967 Buick Gran Sport Base
1964-1972 Buick LeSabre Base
1965-1972 Buick LeSabre Custom
1964-1972 Buick Riviera Base
1965-1966 Buick Riviera Gran Sport
1971 Buick Riviera Gran Sport
1964-1972 Buick Skylark Base
1968-1972 Buick Skylark Custom
1970 Buick Skylark 350
1972 Buick Skylark 350
1964-1967 Buick Special Deluxe
1964-1969 Buick Special Base
1964-1972 Buick Sportwagon Base
1966 Buick Sportwagon Custom
1968-1969 Buick Sportwagon Custom
1964-1969 Buick Wildcat Base
1965 Buick Wildcat Deluxe
1965-1970 Buick Wildcat Custom
1966 Buick Wildcat Gran Sport
1964-1972 Chevrolet Bel Air Base
1964-1972 Chevrolet Biscayne Base
1969-1972 Chevrolet Brookwood Base
1967-1972 Chevrolet Camaro Base
1967-1972 Chevrolet Camaro RS
1967-1972 Chevrolet Camaro SS
1967-1972 Chevrolet Camaro Z28
1966-1972 Chevrolet Caprice Base
1964-1968 Chevrolet Chevelle Base
1964-1972 Chevrolet Chevelle SS
1965-1967 Chevrolet Chevelle Deluxe
1967-1968 Chevrolet Chevelle 300
1967-1969 Chevrolet Chevelle 300 Deluxe
1967-1972 Chevrolet Chevelle Concours
1968-1972 Chevrolet Chevelle Malibu
1968-1972 Chevrolet Chevelle Nomad
1969-1972 Chevrolet Chevelle Greenbrier
1969-1972 Chevrolet Chevelle Concours Estate
1970-1972 Chevrolet Chevelle Base
1964-1967 Chevrolet Chevy II Nova SS
1964-1967 Chevrolet Chevy II Base
1964-1968 Chevrolet Chevy II Nova
1964 Chevrolet Corvair Deluxe
1964 Chevrolet Corvair Monza Spyder
1964-1967 Chevrolet Corvair Base
1964-1969 Chevrolet Corvair Monza
1965-1966 Chevrolet Corvair Corsa
1968-1969 Chevrolet Corvair 500
1964-1972 Chevrolet Corvette Base

…and 85 additional fitments. Contact us to confirm yours.

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