Vehicle is a 2004 GMC 2500 HD 4wd 6.0L auto. Rear diff is a Saginaw 10.5", 12 Bolt, stock 410. I am installing new pinion bearings and carrier side bearings. I need rotating torque on pinion when torqued up, backlash with old gear set (or do I just set to the setting before disasembly), and carrier main bolts (hold side bearings into axle housing). Anyones help is appreciated. I will be reasembling by noon on Saturday.