The 4 bolts that connect the prop shaft to the companion flanges are 54 ft-lb per FSM.
If they've never been touched you don't have to worry, they are so tight from the factory they never work loose.
Mine were off when the replaced my rear diff. So, I'll check them. If they are loose then they get the blue loctite. 54 Ft lbs is a joke since the lug nuts get 80-85.