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but I think the rear diff lock dissengages at about 25 mph in off-road mode.
How fast is it safe to go in 4 Wheel Drive. Or what speed will it kick it back into 2 wheel drive?
If ORM is on diff and 4x4 is good all the way up to the governor. If not in ORM that is when the diff kicks out, but 4x4 still good all the way up to the governor. Mine is 100 mph. ORM has to be under 5mph to turn on. Hill Decent is only good for 2 - 20mph but will stay on up to 40 mph before it shuts off and you have to drop below 40 mph to reactivate it.
Diff unlocks at 12 mph in 2h, 25mph in 4H, 62 mph in 4L, and doesn't automatically unlock in ORM. I'm pretty sure you can lock the diff at any speed as long as you are under the limits depending on set up you run like ORM, 2h, 4h, 4L; but I would highly recommend shifting the diff in only when going straight and off the gas pedal.