Hy Bigtonka, the seal p/n is National 411330N, the "packing" is a felt, National 5M89. There is no crush sleeve, there is a special front bearing with one cup with opposite facing bearing surfaces, and two bearings and a specially sized spacer to give the proper preload when all the pieces are used together. The only "gotcha's" I can think of is, don't use the rear end with the tires on the ground to hold the pinion still for you while you torque the pinion nut, and especially don't use a big impact wrench to tighten it, this puts a lot of strain on the gear teeth and may break or crack some. You can make a rectangular plate to fit over the entire pinion flange and weld a piece of pipe to it that is long enough to reach the ground, or use a large pipe wrench with a piece of cheat pipe over the handle, hope that helps.
