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Although his arms are large enough to torque the Yoke nut with a 1/2-inch wratchet, Goldberg is using one of David's impact wrenches to drive the yolk on; thereby compressing the crush sleeve. This is a critical operation that requires a specific torque number to preload the pinion bearings. David has done hundreds of rearend builds and can tell by the sound of his impact wrench when it's close to the correct torque. We checked his mettle with a torque wrench when finished, and sure enough, it was right.