8 3/4 742 build up

the shim under the forward bearing (near the yoke ) is to set pinion bearing preload ( there is no spacer on a 742 case )-- you will have to increase the thickness of the shim and torque the nut to at least 150 ft/lbs to get a accurate rotating preload reading --- you may have yo do this several times to get the preload right at about 20 -25 inch /lbs --- after getting it right you should be able to torque the nut to the final spec 200 ft /lbs add some loctite on threads on final assembly.