8.75 SNAFU

Naive, am I. You make this sound so easy. So pull the third member, pull the cross shaft and remove the thrust block. Put the cross shaft back in to hold the pinion gears?
Razzle frazzle, I'll be outside pulling stuff out of the car again. If this is as easy as you make it seem, I owe you one.
Any recommendations on gear oil? MIL-L-2105B seems extinct.
Thanks