Eaton Posi Limited-Slip Differential — 30 Spline, 2.73+ Ratio Fr/Rr 8.5in/Rr 8.6in

SKU: EAT19559-010
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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

Enhance Traction and Performance with the Eaton Posi Limited-Slip Differential

Take control of your vehicle's traction with the Eaton Posi limited-slip differential. Renowned for its seamless, automatic operation and robust construction, the Posi differential is the ideal upgrade for street rods, light-duty pickups, and tarmac racing cars seeking superior grip and performance. Its advanced design ensures power is delivered effectively to both wheels, even in challenging conditions.

Key Features and Benefits:

  • Superior Traction Control: Automatically biases torque to the wheel with more grip, significantly improving acceleration and handling on various surfaces.
  • High-Strength Construction: Features net-forged gears for exceptional durability and a rebuildable design for long-term service life.
  • Advanced Clutch System: Utilizes pyrolytic carbon clutches for smooth engagement and reliable performance under load.
  • Versatile Fitment: Designed for GM 8.5-inch front and 8.6-inch rear axles with 30 spline count and compatible with gear ratios of 2.73 and numerically higher.
  • Automatic Operation: Provides seamless, driver-transparent performance without requiring driver input.

This Eaton Posi differential (SKU: 19559-010) is engineered to enhance the performance and drivability of a wide range of vehicles, from classic muscle cars to modern trucks. Whether you're looking to improve launch stability, cornering grip, or overall confidence on the road, the Eaton Posi delivers reliable and effective traction enhancement.

Discover top-tier differential solutions 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 285 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

Enhance Traction and Performance with the Eaton Posi Limited-Slip Differential

Take control of your vehicle's traction with the Eaton Posi limited-slip differential. Renowned for its seamless, automatic operation and robust construction, the Posi differential is the ideal upgrade for street rods, light-duty pickups, and tarmac racing cars seeking superior grip and performance. Its advanced design ensures power is delivered effectively to both wheels, even in challenging conditions.

Key Features and Benefits:

  • Superior Traction Control: Automatically biases torque to the wheel with more grip, significantly improving acceleration and handling on various surfaces.
  • High-Strength Construction: Features net-forged gears for exceptional durability and a rebuildable design for long-term service life.
  • Advanced Clutch System: Utilizes pyrolytic carbon clutches for smooth engagement and reliable performance under load.
  • Versatile Fitment: Designed for GM 8.5-inch front and 8.6-inch rear axles with 30 spline count and compatible with gear ratios of 2.73 and numerically higher.
  • Automatic Operation: Provides seamless, driver-transparent performance without requiring driver input.

This Eaton Posi differential (SKU: 19559-010) is engineered to enhance the performance and drivability of a wide range of vehicles, from classic muscle cars to modern trucks. Whether you're looking to improve launch stability, cornering grip, or overall confidence on the road, the Eaton Posi delivers reliable and effective traction enhancement.

Discover top-tier differential solutions 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 285 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

Enhance Traction and Performance with the Eaton Posi Limited-Slip Differential

Take control of your vehicle's traction with the Eaton Posi limited-slip differential. Renowned for its seamless, automatic operation and robust construction, the Posi differential is the ideal upgrade for street rods, light-duty pickups, and tarmac racing cars seeking superior grip and performance. Its advanced design ensures power is delivered effectively to both wheels, even in challenging conditions.

Key Features and Benefits:

  • Superior Traction Control: Automatically biases torque to the wheel with more grip, significantly improving acceleration and handling on various surfaces.
  • High-Strength Construction: Features net-forged gears for exceptional durability and a rebuildable design for long-term service life.
  • Advanced Clutch System: Utilizes pyrolytic carbon clutches for smooth engagement and reliable performance under load.
  • Versatile Fitment: Designed for GM 8.5-inch front and 8.6-inch rear axles with 30 spline count and compatible with gear ratios of 2.73 and numerically higher.
  • Automatic Operation: Provides seamless, driver-transparent performance without requiring driver input.

This Eaton Posi differential (SKU: 19559-010) is engineered to enhance the performance and drivability of a wide range of vehicles, from classic muscle cars to modern trucks. Whether you're looking to improve launch stability, cornering grip, or overall confidence on the road, the Eaton Posi delivers reliable and effective traction enhancement.

Discover top-tier differential solutions 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 285 additional fitments. Contact us to confirm yours.

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