1972-09 Wrangler and CJ 1984-01 XJ Cherokee 1986-92 MJ Comanche 1993-98 ZJ Grand Cherokee 1999-04 WJ Grand Cherokee 2002-07 KJ Liberty Dana Model 30 front axle 27 spline Gear ratio 2.73 to 3.54 An incorporated, computer-optimized cross brace design adds over 900 foot-pounds of torsional rigidity to the entire axle assembly. The resulting increased flex strength in the housing encourages improved meshing of the ring and pinion gears and greater carrier bearing support for longer component life and overall load strength. The low profile shape of the housing maximizes the running gear clearance around the unit and provides optimal approach and departure angles. A unique combination dipstick and filler cap design allows for the differential oil levels to be adjusted for customized high driveline angles and allows the user to check the oil for possible water contamination without having to drain the unit. Made from high quality rare earth magnets, both the dipstick and the drain plug are designed to collect any metal wear particles floating in the fluid. Powder coated in red, CNC machined and then clear coated for durable finish, the ARB differential cover is the perfect way to protect your differential assembly.