Eaton Detroit Truetrac 28 Spline Limited Slip Differential — Fits 1988-1989 GM 7.5/7.625in 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

Ultimate Traction Control with Eaton Detroit Truetrac

Experience superior handling and power delivery with the Eaton Detroit Truetrac, the industry-leading helical-gear limited-slip differential. Engineered for enthusiasts who demand reliability, this unit automatically maximizes wheel traction in both forward and reverse without the need for clutches or friction modifiers. Whether you are navigating tight corners or launching from a stop, the Truetrac ensures power is distributed effectively to the wheels with the most grip.

Key Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 3.23 and Up
  • Rear End Type: GM 7.5in / 7.625in
  • Design: Maintenance-free helical gear system

This differential is the perfect upgrade for classic GM platforms, providing smooth, quiet operation that outperforms traditional clutch-style limited slips. Because it is fully automatic and requires no special maintenance, you can focus on the drive rather than the hardware. Its robust construction handles increased torque loads, making it an essential component for street performance and light track applications. By eliminating the chatter and wear associated with clutch-based units, the Truetrac offers a seamless driving experience that adapts instantly to changing road conditions. Trust your vehicle's performance to the engineering excellence found at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-2002 Buick Century Custom
1991-1996 Buick Century Special
1996-2002 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
1988-2002 Buick LeSabre Custom
1988-2002 Buick LeSabre Limited
1991-2002 Buick Park Avenue Base
1991-2002 Buick Park Avenue Ultra
1988-1991 Buick Reatta Base
1988-1996 Buick Regal Custom
1988-1996 Buick Regal Limited
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1997-2002 Buick Regal GS
1997-2002 Buick Regal LS
1998 Buick Regal 25th Anniversary Edition
2000 Buick Regal GSE
2000 Buick Regal LSE
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1999 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
1988-1989 Buick Skylark Limited
1988-1998 Buick Skylark Custom
1990-1991 Buick Skylark Luxury Edition
1990-1991 Buick Skylark Base
1990-1997 Buick Skylark Gran Sport
1993-1997 Buick Skylark Limited
1996 Buick Skylark Olympic Gold Edition
1988-1995 Chevrolet Astro CL
1988-1995 Chevrolet Astro CS
1988-2005 Chevrolet Astro LT
1988-2005 Chevrolet Astro Base
1996-2005 Chevrolet Astro LS
1988-1996 Chevrolet Beretta Base
1989-1993 Chevrolet Beretta GT
1990 Chevrolet Beretta Indianapolis 500 Pace Car
1990-1993 Chevrolet Beretta GTZ
1994-1996 Chevrolet Beretta Z26
1988 Chevrolet Camaro Base
1988-1990 Chevrolet Camaro Iroc-Z
1989-1992 Chevrolet Camaro RS
1991-2002 Chevrolet Camaro Z28
1992 Chevrolet Camaro Z28 Heritage Edition

…and 264 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

Ultimate Traction Control with Eaton Detroit Truetrac

Experience superior handling and power delivery with the Eaton Detroit Truetrac, the industry-leading helical-gear limited-slip differential. Engineered for enthusiasts who demand reliability, this unit automatically maximizes wheel traction in both forward and reverse without the need for clutches or friction modifiers. Whether you are navigating tight corners or launching from a stop, the Truetrac ensures power is distributed effectively to the wheels with the most grip.

Key Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 3.23 and Up
  • Rear End Type: GM 7.5in / 7.625in
  • Design: Maintenance-free helical gear system

This differential is the perfect upgrade for classic GM platforms, providing smooth, quiet operation that outperforms traditional clutch-style limited slips. Because it is fully automatic and requires no special maintenance, you can focus on the drive rather than the hardware. Its robust construction handles increased torque loads, making it an essential component for street performance and light track applications. By eliminating the chatter and wear associated with clutch-based units, the Truetrac offers a seamless driving experience that adapts instantly to changing road conditions. Trust your vehicle's performance to the engineering excellence found at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-2002 Buick Century Custom
1991-1996 Buick Century Special
1996-2002 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
1988-2002 Buick LeSabre Custom
1988-2002 Buick LeSabre Limited
1991-2002 Buick Park Avenue Base
1991-2002 Buick Park Avenue Ultra
1988-1991 Buick Reatta Base
1988-1996 Buick Regal Custom
1988-1996 Buick Regal Limited
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1997-2002 Buick Regal GS
1997-2002 Buick Regal LS
1998 Buick Regal 25th Anniversary Edition
2000 Buick Regal GSE
2000 Buick Regal LSE
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1999 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
1988-1989 Buick Skylark Limited
1988-1998 Buick Skylark Custom
1990-1991 Buick Skylark Luxury Edition
1990-1991 Buick Skylark Base
1990-1997 Buick Skylark Gran Sport
1993-1997 Buick Skylark Limited
1996 Buick Skylark Olympic Gold Edition
1988-1995 Chevrolet Astro CL
1988-1995 Chevrolet Astro CS
1988-2005 Chevrolet Astro LT
1988-2005 Chevrolet Astro Base
1996-2005 Chevrolet Astro LS
1988-1996 Chevrolet Beretta Base
1989-1993 Chevrolet Beretta GT
1990 Chevrolet Beretta Indianapolis 500 Pace Car
1990-1993 Chevrolet Beretta GTZ
1994-1996 Chevrolet Beretta Z26
1988 Chevrolet Camaro Base
1988-1990 Chevrolet Camaro Iroc-Z
1989-1992 Chevrolet Camaro RS
1991-2002 Chevrolet Camaro Z28
1992 Chevrolet Camaro Z28 Heritage Edition

…and 264 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

Ultimate Traction Control with Eaton Detroit Truetrac

Experience superior handling and power delivery with the Eaton Detroit Truetrac, the industry-leading helical-gear limited-slip differential. Engineered for enthusiasts who demand reliability, this unit automatically maximizes wheel traction in both forward and reverse without the need for clutches or friction modifiers. Whether you are navigating tight corners or launching from a stop, the Truetrac ensures power is distributed effectively to the wheels with the most grip.

Key Technical Specifications

  • Spline Count: 28 Spline
  • Axle Shaft Diameter: 1.20 inches
  • Gear Ratio Compatibility: 3.23 and Up
  • Rear End Type: GM 7.5in / 7.625in
  • Design: Maintenance-free helical gear system

This differential is the perfect upgrade for classic GM platforms, providing smooth, quiet operation that outperforms traditional clutch-style limited slips. Because it is fully automatic and requires no special maintenance, you can focus on the drive rather than the hardware. Its robust construction handles increased torque loads, making it an essential component for street performance and light track applications. By eliminating the chatter and wear associated with clutch-based units, the Truetrac offers a seamless driving experience that adapts instantly to changing road conditions. Trust your vehicle's performance to the engineering excellence found at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1988-1989 Buick Century Estate Wagon
1988-1993 Buick Century Limited
1988-2002 Buick Century Custom
1991-1996 Buick Century Special
1996-2002 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
1988-2002 Buick LeSabre Custom
1988-2002 Buick LeSabre Limited
1991-2002 Buick Park Avenue Base
1991-2002 Buick Park Avenue Ultra
1988-1991 Buick Reatta Base
1988-1996 Buick Regal Custom
1988-1996 Buick Regal Limited
1989-1996 Buick Regal Gran Sport
1996 Buick Regal Olympic Gold Edition
1997-2002 Buick Regal GS
1997-2002 Buick Regal LS
1998 Buick Regal 25th Anniversary Edition
2000 Buick Regal GSE
2000 Buick Regal LSE
1988-1989 Buick Riviera T-Type
1988-1993 Buick Riviera Luxury
1995-1999 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
1988-1989 Buick Skylark Limited
1988-1998 Buick Skylark Custom
1990-1991 Buick Skylark Luxury Edition
1990-1991 Buick Skylark Base
1990-1997 Buick Skylark Gran Sport
1993-1997 Buick Skylark Limited
1996 Buick Skylark Olympic Gold Edition
1988-1995 Chevrolet Astro CL
1988-1995 Chevrolet Astro CS
1988-2005 Chevrolet Astro LT
1988-2005 Chevrolet Astro Base
1996-2005 Chevrolet Astro LS
1988-1996 Chevrolet Beretta Base
1989-1993 Chevrolet Beretta GT
1990 Chevrolet Beretta Indianapolis 500 Pace Car
1990-1993 Chevrolet Beretta GTZ
1994-1996 Chevrolet Beretta Z26
1988 Chevrolet Camaro Base
1988-1990 Chevrolet Camaro Iroc-Z
1989-1992 Chevrolet Camaro RS
1991-2002 Chevrolet Camaro Z28
1992 Chevrolet Camaro Z28 Heritage Edition

…and 264 additional fitments. Contact us to confirm yours.

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