Brand new in retail packaging! It will be shipped in a separate box to protect from damage. Please make sure this differential will fit your vehicle. FAST FREE SHIPPING! Ships same or next business day! MONDAY-FRIDAY UPS or FedEx Ground Eaton Differentials 913A589 Detroit Truetrac Differential Detroit Truetrac Differential; 30 Spline; 1.31 in. Axle Shaft Diameter; 3.73 And Down Ring Gear Pinion Ratio; Rear Dana 44; FEATURES: Helical Gear Limited Slip Differential Optimized Torque Bias Ratios Deliver Max Acceleration And Handling Automatic Engagement Works In Forward And Reverse Ideal For Most Vehicles Durable; Smooth; Quiet Operation No Special Lubrication Or Friction Modifiers Needed 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. When it comes to providing traction, only Eaton offers a solution for every traction need. As the world's largest producer of differentials, Eaton provides innovative traction solutions to OEM's and the automotive aftermarket. Eaton limited slip differentials like the Posi and Detroit Locker dominate the performance market as the choice of professional racers in NASCAR, NHRA, IHRA, CORR, NMRA, NMCA and other racing associations. Off-road enthusiasts, rock crawlers, trail riders and ATV buffs also crave the superior traction that the complete line of performance differentials provides. A heavy-duty product line of "apex" differentials built exclusively for military vehicles, construction equipment, heavy hauling, forestry and agricultural vehicles attests to the inherent strength and high quality of Eaton's entire line of premium differentials. Beyond the rigors of every day competition, all differentials are proven and validated at Eaton's Proving Grounds in Marshall, Michigan, where it has complete testing facilities and on-road/off-road test tracks. Locker or limited slip differentials? Clutch or gear style? Automatic or electronic? Only Eaton offers them all. Fits the following vehicles: 1976-1983 Jeep CJ5, 1976-1986 Jeep CJ7, 1981-1985 Jeep Scrambler, 1984-1991 Jeep Grand Wagoneer, 1993 Jeep Grand Wagoneer, 1986-1993 Jeep Cherokee, 1986-1992 Jeep Comanche, 1993-2000 Isuzu Rodeo, 1997-2006 Jeep TJ, 1997-2017 Jeep Wrangler, 2018 Jeep Wrangler JK