Eaton Detroit Truetrac Differential, 27-Spline, Dana 30, 3.73 and Up Ratio, Part Number EAT912A588

The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Maintenance-free, it features smooth, automatic operation in forward and reverse. Its versatility makes Detroit Truetrac the ideal traction solution for almost any type of vehicle. Detroit Truetrac® Differential; 27 Spline; 1.15 in. Axle Shaft Diameter; 3.73 And Up Ring Gear Pinion Ratio; Dana 30; Rear;

• Optimized Torque Bias Ratios Deliver Max Acceleration And Handling
• No Special Lubrication Or Friction Modifiers Needed
• Helical Gear Limited Slip Differential
• Durable; Smooth; Quiet Operation
• Works In Forward And Reverse
• Ideal For Most Vehicles
• Automatic Engagement

The Eaton Detroit Truetrac Differential is a helical-gear limited-slip differential designed to improve traction, acceleration, and handling without requiring driver input. Its automatic operation helps distribute torque between the drive wheels when traction varies, supporting confident performance in both forward and reverse. This Dana 30 rear differential is designed for applications using 27-spline axle shafts with a 1.15-inch axle shaft diameter and 3.73-and-up ring gear and pinion ratios.

Built for dependable street and performance use, the Eaton Detroit Truetrac uses durable helical gears to provide smooth, quiet, and maintenance-free operation. It does not require special lubrication or friction modifiers, simplifying installation and ongoing service. Optimized torque bias ratios help maximize available traction while preserving predictable driving characteristics. The automatic engagement design makes it a practical traction solution for a wide range of vehicles.

• Feature: Helical-gear limited-slip differential with automatic engagement
• Feature: Optimized torque bias ratios for improved acceleration and handling
• Feature: Smooth, quiet, and durable operation
• Feature: Maintenance-free design requiring no special lubricant or friction modifiers

Product Specifications and Technical Data

• Brand: Eaton
• Product Line: Detroit Truetrac
• Part Number: EAT912A588
• Differential Type: Helical-gear limited-slip
• Axle Application: Dana 30 rear axle
• Axle Shaft Spline Count: 27 spline
• Axle Shaft Diameter: 1.15 inches
• Ring Gear and Pinion Ratio: 3.73 and up

What's Included

One Eaton Detroit Truetrac limited-slip differential for the specified Dana 30 rear axle application. Installation hardware, bearings, seals, lubricant, and other components are not indicated as included and may need to be sourced separately.

Fitment

Listed fitment includes 1970-1974 Volvo 164 models and 1971-1974 Volvo 144 models, subject to axle configuration and ratio verification. Confirm the vehicle's Dana 30 axle, 27-spline configuration, axle shaft diameter, and ring gear and pinion ratio before installation.

Features:

• Helical-gear limited-slip differential with automatic engagement
• Optimized torque bias ratios for improved acceleration and handling
• Smooth, quiet, and durable operation
• Maintenance-free design requiring no special lubricant or friction modifiers

Fitments:
1970 Volvo 142 Base
1970 Volvo 142 S
1970 Volvo 144 Base
1970 Volvo 144 S
1970 Volvo 164 Base
1970 Volvo 164 S
1971 Volvo 142 Base
1971 Volvo 142 E
1971 Volvo 142 S
1971 Volvo 144 Base
1971 Volvo 144 S
1971 Volvo 164 Base
1971 Volvo 164 S
1972 Volvo 142 Base
1972 Volvo 142 E
1972 Volvo 142 S
1972 Volvo 144 Base
1972 Volvo 144 S
1972 Volvo 164 Base
1972 Volvo 164 S
1973 Volvo 142 Base
1973 Volvo 142 S
1973 Volvo 144 Base
1973 Volvo 144 S
1973 Volvo 164 E
1973 Volvo 164 S
1974 Volvo 142 Base
1974 Volvo 142 GL
1974 Volvo 142 S
1974 Volvo 144 Base
1974 Volvo 144 GL
1974 Volvo 144 S
1974 Volvo 164 E
1974 Volvo 164 S
1975 Volvo 164 Base
1975 Volvo 242 GL
1975 Volvo 245 Base
1976 Volvo 242 Base
1976 Volvo 245 Base
1976 Volvo 265 Base
1977 Volvo 242 Base
1977 Volvo 245 Base
1977 Volvo 265 GL
1978 Volvo 242 Base
1978 Volvo 245 Base
1978 Volvo 265 GL
1979 Volvo 242 Base
1979 Volvo 245 DL
1979 Volvo 265 GL
1980 Volvo 242 DL
1980 Volvo 245 DL
1980 Volvo 265 GLE
1981 Volvo 242 DL
1981 Volvo 242 GL
1981 Volvo 242 GLT
1981 Volvo 242 Turbo
1981 Volvo 245 DL
1981 Volvo 245 GLT
1981 Volvo 265 GLE
1982 Volvo 242 DL
1982 Volvo 242 GLT
1982 Volvo 245 DL
1982 Volvo 245 GL
1982 Volvo 245 GLT
1983 Volvo 242 DL
1983 Volvo 242 GLT
1983 Volvo 245 DL
1983 Volvo 245 GL
1983 Volvo 245 GLT
1984 Volvo 242 DL
1984 Volvo 242 GLT
1984 Volvo 245 Base
1985 Volvo 245 Base
1986 Volvo 245 DL
1986 Volvo 245 GL
1987 Volvo 245 DL
1987 Volvo 245 GL
1988 Volvo 245 DL
1988 Volvo 245 GL
1989 Volvo 245 DL
1989 Volvo 245 GL
1990 Volvo 240 Base
1990 Volvo 240 DL
1991 Volvo 240 Base
1991 Volvo 240 SE
1992 Volvo 240 Base
1992 Volvo 240 GL
1993 Volvo 240 Base

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1