{"product_id":"eaton-detroit-truetrac-differential-27-spline-dana-30-3-73-and-up-ratio-part-number-eat912a588","title":"Eaton Detroit Truetrac Differential, 27-Spline, Dana 30, 3.73 and Up Ratio, Part Number EAT912A588","description":"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.\nDetroit Truetrac® Differential; 27 Spline; 1.15 in. Axle Shaft Diameter; 3.73 And Up Ring Gear Pinion Ratio; Dana 30; Rear;\n\u003cul\u003e\n  \u003cli\u003eOptimized Torque Bias Ratios Deliver Max Acceleration And Handling\u003c\/li\u003e\n  \u003cli\u003eNo Special Lubrication Or Friction Modifiers Needed\u003c\/li\u003e\n  \u003cli\u003eHelical Gear Limited Slip Differential\u003c\/li\u003e\n  \u003cli\u003eDurable; Smooth; Quiet Operation\u003c\/li\u003e\n  \u003cli\u003eWorks In Forward And Reverse\u003c\/li\u003e\n  \u003cli\u003eIdeal For Most Vehicles\u003c\/li\u003e\n  \u003cli\u003eAutomatic Engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eBuilt 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFeature: Helical-gear limited-slip differential with automatic engagement\u003c\/li\u003e\n  \u003cli\u003eFeature: Optimized torque bias ratios for improved acceleration and handling\u003c\/li\u003e\n  \u003cli\u003eFeature: Smooth, quiet, and durable operation\u003c\/li\u003e\n  \u003cli\u003eFeature: Maintenance-free design requiring no special lubricant or friction modifiers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Specifications and Technical Data\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Eaton\u003c\/li\u003e\n  \u003cli\u003eProduct Line: Detroit Truetrac\u003c\/li\u003e\n  \u003cli\u003ePart Number: EAT912A588\u003c\/li\u003e\n  \u003cli\u003eDifferential Type: Helical-gear limited-slip\u003c\/li\u003e\n  \u003cli\u003eAxle Application: Dana 30 rear axle\u003c\/li\u003e\n  \u003cli\u003eAxle Shaft Spline Count: 27 spline\u003c\/li\u003e\n  \u003cli\u003eAxle Shaft Diameter: 1.15 inches\u003c\/li\u003e\n  \u003cli\u003eRing Gear and Pinion Ratio: 3.73 and up\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOne 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eListed 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.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHelical-gear limited-slip differential with automatic engagement\u003c\/li\u003e\n\u003cli\u003eOptimized torque bias ratios for improved acceleration and handling\u003c\/li\u003e\n\u003cli\u003eSmooth, quiet, and durable operation\u003c\/li\u003e\n\u003cli\u003eMaintenance-free design requiring no special lubricant or friction modifiers\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitments:\u003cbr\u003e\n1970 Volvo 142 Base\u003cbr\u003e\n1970 Volvo 142 S\u003cbr\u003e\n1970 Volvo 144 Base\u003cbr\u003e\n1970 Volvo 144 S\u003cbr\u003e\n1970 Volvo 164 Base\u003cbr\u003e\n1970 Volvo 164 S\u003cbr\u003e\n1971 Volvo 142 Base\u003cbr\u003e\n1971 Volvo 142 E\u003cbr\u003e\n1971 Volvo 142 S\u003cbr\u003e\n1971 Volvo 144 Base\u003cbr\u003e\n1971 Volvo 144 S\u003cbr\u003e\n1971 Volvo 164 Base\u003cbr\u003e\n1971 Volvo 164 S\u003cbr\u003e\n1972 Volvo 142 Base\u003cbr\u003e\n1972 Volvo 142 E\u003cbr\u003e\n1972 Volvo 142 S\u003cbr\u003e\n1972 Volvo 144 Base\u003cbr\u003e\n1972 Volvo 144 S\u003cbr\u003e\n1972 Volvo 164 Base\u003cbr\u003e\n1972 Volvo 164 S\u003cbr\u003e\n1973 Volvo 142 Base\u003cbr\u003e\n1973 Volvo 142 S\u003cbr\u003e\n1973 Volvo 144 Base\u003cbr\u003e\n1973 Volvo 144 S\u003cbr\u003e\n1973 Volvo 164 E\u003cbr\u003e\n1973 Volvo 164 S\u003cbr\u003e\n1974 Volvo 142 Base\u003cbr\u003e\n1974 Volvo 142 GL\u003cbr\u003e\n1974 Volvo 142 S\u003cbr\u003e\n1974 Volvo 144 Base\u003cbr\u003e\n1974 Volvo 144 GL\u003cbr\u003e\n1974 Volvo 144 S\u003cbr\u003e\n1974 Volvo 164 E\u003cbr\u003e\n1974 Volvo 164 S\u003cbr\u003e\n1975 Volvo 164 Base\u003cbr\u003e\n1975 Volvo 242 GL\u003cbr\u003e\n1975 Volvo 245 Base\u003cbr\u003e\n1976 Volvo 242 Base\u003cbr\u003e\n1976 Volvo 245 Base\u003cbr\u003e\n1976 Volvo 265 Base\u003cbr\u003e\n1977 Volvo 242 Base\u003cbr\u003e\n1977 Volvo 245 Base\u003cbr\u003e\n1977 Volvo 265 GL\u003cbr\u003e\n1978 Volvo 242 Base\u003cbr\u003e\n1978 Volvo 245 Base\u003cbr\u003e\n1978 Volvo 265 GL\u003cbr\u003e\n1979 Volvo 242 Base\u003cbr\u003e\n1979 Volvo 245 DL\u003cbr\u003e\n1979 Volvo 265 GL\u003cbr\u003e\n1980 Volvo 242 DL\u003cbr\u003e\n1980 Volvo 245 DL\u003cbr\u003e\n1980 Volvo 265 GLE\u003cbr\u003e\n1981 Volvo 242 DL\u003cbr\u003e\n1981 Volvo 242 GL\u003cbr\u003e\n1981 Volvo 242 GLT\u003cbr\u003e\n1981 Volvo 242 Turbo\u003cbr\u003e\n1981 Volvo 245 DL\u003cbr\u003e\n1981 Volvo 245 GLT\u003cbr\u003e\n1981 Volvo 265 GLE\u003cbr\u003e\n1982 Volvo 242 DL\u003cbr\u003e\n1982 Volvo 242 GLT\u003cbr\u003e\n1982 Volvo 245 DL\u003cbr\u003e\n1982 Volvo 245 GL\u003cbr\u003e\n1982 Volvo 245 GLT\u003cbr\u003e\n1983 Volvo 242 DL\u003cbr\u003e\n1983 Volvo 242 GLT\u003cbr\u003e\n1983 Volvo 245 DL\u003cbr\u003e\n1983 Volvo 245 GL\u003cbr\u003e\n1983 Volvo 245 GLT\u003cbr\u003e\n1984 Volvo 242 DL\u003cbr\u003e\n1984 Volvo 242 GLT\u003cbr\u003e\n1984 Volvo 245 Base\u003cbr\u003e\n1985 Volvo 245 Base\u003cbr\u003e\n1986 Volvo 245 DL\u003cbr\u003e\n1986 Volvo 245 GL\u003cbr\u003e\n1987 Volvo 245 DL\u003cbr\u003e\n1987 Volvo 245 GL\u003cbr\u003e\n1988 Volvo 245 DL\u003cbr\u003e\n1988 Volvo 245 GL\u003cbr\u003e\n1989 Volvo 245 DL\u003cbr\u003e\n1989 Volvo 245 GL\u003cbr\u003e\n1990 Volvo 240 Base\u003cbr\u003e\n1990 Volvo 240 DL\u003cbr\u003e\n1991 Volvo 240 Base\u003cbr\u003e\n1991 Volvo 240 SE\u003cbr\u003e\n1992 Volvo 240 Base\u003cbr\u003e\n1992 Volvo 240 GL\u003cbr\u003e\n1993 Volvo 240 Base\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; 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