On the front drive shaft, Is it a good idea to use anything on the bolt threads on either end. It looked like the had thread sealer on them when I took them off.

We did not mark the shaft position when we removed the front drive shaft? Can this be an issue?

I was wondering thread sealer? Anti-seez? or maybe Blue removable Loctite? Blue Loctite seems to be the answer

Does anybody know the torque spec for the bolts?

SHAFT-PROPELLER FRONT
REMOVAL
REMOVAL – 2.8L DIESEL
1. With vehicle in neutral, position vehicle on hoist.
2. Remove left side exhaust flange (1) bolts. We never messed with the exhaust at all. Never saw an issue there. Maybe we will when we re-install
3. Mark companion flanges (3) and C/V joints at the
front (2) and rear of the propeller shaft for installation
reference.
4. Remove bolts (1) from the front and rear C/V joints.
5. Push propeller shaft forward to clear transfer case
companion flange (2).
6. Remove shaft from the front axle companion
flange.
7. Pull down on the exhaust and tilt the front of the
shaft down and pull shaft forward and remove from
the vehicle.

INSTALLATION – 2.8L DIESEL
1. Install propeller shaft between companion flanges.
2. Align marks on the companion flanges with the
marks on the C/V joints.
3. Install front C/V joint bolts and tighten to 30 N·m
(22 ft. lbs.).
4. Install rear C/V joint bolts (1) and tighten to 30 N·m
(22 ft. lbs.).
5. Install exhaust flange (1) and bolts.