To replace the drive pinion bearings on 8.6 and 9.5 inch axles, gather the necessary tools: j 7818 (Inner Bearing Race Installer), j 8092 (Universal Driver Handle - 3/4 in - 10), j 8611-01 (Rear Pinion Bearing Race Installer), j 8614-01 (Flange and Pulley Holding Tool), j 22306 (Rear Pinion Cup Bearing Installer), j 22912-01 (Split Plate Bearing Puller), j 24433 (Pinion Cone and Side Bearing Installer), j 36614 (Inner Pinion Bearing Installer), j 45870 (Pinion Bearing Cup Installer), and j 45871 (Pinion Bearing Remover). Start by lifting the vehicle then remove both the Differential assembly along with the drive pinion. To remove the Pinion Bearing from an 8.6 inch axle press it off with the j 45871 along with an inverted j 22912-01 around the j 45871. You should utilize the j 22912-01 to press off the bearing from the 9.5 inch axle. Install the shim together with the outer and inner Pinion Bearing cups by striking them off with a hammer and brass drift. The Pinion Bearing cup requires installation with the use of j 8611-01 for 8.6 inches and j 7818 for 9.5 inches along with j 8092. The j 45870 (8.6 inch axle) or j 22306 (9.5 inch axle) together with j 8092 enable installing the inner Pinion Bearing cup. Before inserting the inner Pinion Bearing, place the selected shim between the components and use j 24433 or j 36614 tool to drive the bearing until it rests on the shim. The technician needs to add a new collapsible spacer before applying lubrication to pinion bearings for the subsequent axle housing installation. To proceed, install the j 22388 to fit a brand new pinion oil seal and then push the pinion into the axle housing while applying sealant to the pinion yoke splines. Ask for the pinion yoke installation while keeping it in line with previous removal marks then adjust position through soft-faced hammer taps. The pinion yoke receives securement from the j 8614-01 while tightening the pinion nut until the pinion end play reaches complete utilization. Test the rotating torque of the pinion using an inch-pound torque wrench to obtain values between 1.0-2.3 nm (10-20 inch lbs.) for used or 1.7-3.4 nm (15-30 inch lbs.) for new bearings. Small steps of additional torque to the pinion nut may be needed to obtain the specified measurements then multiple rotations of the pinion will validate correct bearing seating. The final steps include replacing the Differential assembly followed by lubricant addition to the axle before lowering the vehicle.