2WD to 4WD and back

[TenaciousRock]

Newbie question about 4WD while driving. I'm confident I have a fairly good base on 4WD however I still have a question about it.

Things I've learned already (correct me if I'm wrong):
-4Lo must be engaged/disengaged by putting a stopped vehicle in N with foot on the brake and then turn the switch to 4Lo. At this point gears shift in the transfer case which effectively doubles power output to the wheels. 4Lo should not be used over 25mph.
-4Hi may be used at speeds up to 55mph.
-4WD is not intended for dry pavement driving

What I'd like to know is how you switch between 2WD and 4WD (hi). Can you do it on the fly while driving, just turning the knob/switch between the two options? If so, can you do it under acceleration or must it be done with either a steady speed or decelerating/coasting?

 

[snicklfritz]

if working correctly you should be able to just switch to 4 hi but not under acceleration. if rear wheels are spinning front wheels will not lock in until front and rear tire have reached the same speeds. it really depends on what type of acceleration your talking about. same speed or deceleration would all be fine. hope this helps