Thanks man. Do you think that the shaft that goes thru the seal may be rusted so that I should have some steel wool and fine sand paper on hand to "descale" it if necessary?

Ive never worked on one of these and I really wanna get it right the first time and have everything on hand that I will need to try and bang it out quick. And good call on the grease, I had that in mind but others may not have.

After sitting in a field for 7 years I expected these little things to crop up but the darn thing is leaking so bad now, I just cant drive it till its fixed. Its got oil mist all over the back window now!

After looking thru the manual, it doens't look like that hard of a fix. Just drop the drive shaft and have at it. But it says to drain the diff and to have the truck elevated to get to it? Is it necessary to lift the wheels off the ground to do this? And if so, why?