1991 Crew Cab 14 bolt question

[gmech]

Heres the short of it. I bought my 91 CC and someone had a taken the ring and pinion/ locker from it. I bought a axle from a guy that had about 3000 miles. He had bought it new from Boyce (they deal in military axles) It had a 4:10 with a locker in it. The housing had spring mounts welded on an angle for a lifted Blazer. So I removed the gears etc from it and installed it into my housing. I am also re-using the differential bearings, but a new pinion support bearing.
My questions are
1- Do I need to install a new crush sleeve on the pinion gear
2- Can I install the shafts prior to having my backlash etc. set