{"product_id":"eaton-detroit-truetrac-differential-28-spline-rear-9-inch-axle-3-25-and-up-gear-ratio","title":"Eaton Detroit Truetrac Differential, 28-Spline, Rear 9-Inch Axle, 3.25 and Up Gear Ratio","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; 28 Spline; 1.20 in. Axle Shaft Diameter; Rear 9 in.; 3.25 And Up Ring Gear Pinion Ratio;\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 in rear-wheel-drive vehicles equipped with a 9-inch rear axle. Part number EAT912A587 uses automatic torque-biasing technology to redirect power to the wheel with available traction, helping maintain forward motion during varying road and driving conditions.\u003c\/p\u003e\u003cp\u003eDesigned for 28-spline axle applications with a 1.20-inch axle shaft diameter and 3.25-and-up ring gear and pinion ratios, the Detroit Truetrac operates smoothly in both forward and reverse. Its maintenance-free design requires no special lubrication or friction modifiers, simplifying installation and long-term service requirements. The helical gear arrangement provides durable, quiet operation without the complexity of clutch-style limited-slip components.\u003c\/p\u003e\u003cp\u003eThe Eaton Detroit Truetrac is suitable for a broad range of vehicles and performance applications where dependable traction and predictable handling are important. Automatic engagement requires no driver input, allowing the differential to respond as traction conditions change. This differential is intended for compatible rear 9-inch axle configurations and should be matched to the vehicle’s axle spline count, shaft diameter, and gear ratio before installation.\u003c\/p\u003e\u003ch3\u003eKey Product Specifications \u0026amp; Technical Data\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBrand: Eaton\u003c\/li\u003e\n\u003cli\u003ePart Number: EAT912A587\u003c\/li\u003e\n\u003cli\u003eDifferential Type: Helical-gear limited-slip differential\u003c\/li\u003e\n\u003cli\u003eAxle Position: Rear\u003c\/li\u003e\n\u003cli\u003eAxle Type: 9-inch rear axle\u003c\/li\u003e\n\u003cli\u003eAxle Spline Count: 28 spline\u003c\/li\u003e\n\u003cli\u003eAxle Shaft Diameter: 1.20 inches\u003c\/li\u003e\n\u003cli\u003eCompatible Gear Ratio: 3.25 and up ring gear and pinion ratio\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cp\u003eOne Eaton Detroit Truetrac differential assembly. Installation hardware, lubricant, seals, bearings, and other vehicle-specific components are not included unless supplied by the vehicle or axle manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOptimized Torque Biasing: Helps maximize acceleration and handling by transferring torque toward the wheel with available traction.\u003c\/li\u003e\n\u003cli\u003eAutomatic Engagement: Responds to changing traction conditions without requiring driver input.\u003c\/li\u003e\n\u003cli\u003eMaintenance-Free Design: Requires no special lubrication or friction modifiers for normal operation.\u003c\/li\u003e\n\u003cli\u003eSmooth, Quiet Operation: Durable helical gear construction supports consistent performance in forward and reverse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eAir Freight Prohibited: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eNot Carb Approved: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLtl Freight Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eProp 65: Unknown\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003ePart Type: automotive\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eEpa: N\/A\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCarb Acknowledgement Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eRegular Stock: t\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eUnits Per Sku: 1\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":67646950244604,"sku":"912A587","price":706.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/b99887b8556e01aff2bb11ec03f6c212_6159c6b9-25f2-4fe5-8687-d718aec74a2c.jpg?v=1791183393","url":"https:\/\/diycustoms.store\/products\/eaton-detroit-truetrac-differential-28-spline-rear-9-inch-axle-3-25-and-up-gear-ratio","provider":"diycustoms.store","version":"1.0","type":"link"}