There are a couple different methods to correctly torque the nut on the pinion. One way that I have used in the past with excellent results,is to tighten the pinion nut real good and snug just as you feel the crush sleeve begin its resistance,and then you actually place an "inch pound" torque wrench(Dial or Bar style tends to be a little quicker and more exacting than a click style) with correct socket on pinion nut and rotate the pinion by way of the smaller torque wrench (ring gear and carrier removed).If the inch-pound torque wrench doesn't click before the pinion rotates(inch-pound wrench set approx @12-15),then snug the pinoin nut up with your 1/2 drive impact more.Tighten nut in SMALL increments.Dont overshoot it,other wise you run the risk of wasting the one time use crush sleeve and burning up the pinion bearings.If say the wrench clicks @10,11,12ish before the pinion rotates,but if set @ 15 or so,and the pinion rotates before the torque wrench clicks, you are in the right area.What you are doing is measuring the amount of "rotational drag" on the pinion with the inlb torque wrench.Another way is if the crush sleeve is replaced with a solid spacer,the nut can be torqued down with a regular pop wrench to about 60-75 ft/lbs.
The only torque you should be concerned with is the torque it takes to rotate the pinion gear alone, 8-14 inch pounds for old bearings, 16-29 in/lbs. for new bearings. The torque it takes to crush the crush collar (tightening the pinion nut) will be above 140 foot lbs. and this will set your tension on the pinion bearings. If you put a new crush collar in you are going to have to remove axles and carrier to get the proper pre-load on the pinion bearings.
The shim between the inner bearing and the pinion is critical and if it's lost you need special tools to set the pinion depth. replace the bearings and seal with an new crush sleeve thighten the pinion nut until the sleeve crushes and you can't move the pinion up and down. Then very slowly tighten the pinion nut checking the rotational torque. You will need an inch pound torque wrench, when the preload is correct it should take between 20-25 inch pounds of torque to rotate the pinion. If you get it too tight you need to replace the crush sleeve and start over. Proper bearing preload and gear mesh are critical.
to replace pinion shaft seal you need to drop the drive shaft from the rear end then with large socket remove pinion nut from front of yoke remove yoke remove old pinion seal install new pinion seal reinstall yoke and pinion nut to specified torque re install drive shaft note now is the time to check and see if U-joints need replacing
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