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Mine is tricky to get it to go between high and low both ways I have to be in N with a roll or move a little then try and move a little more and eventually the gears line up and it goes right in.

It sounds like an am radio with bad reception

The front driveshaft has a slip collar there should be no play in this if there is then it needs to be rebuilt. Any driveshaft shop should be able to do it. I have found when things are slightly out of balance they can vibrate and make noises but only at a certain speed or rpm.

There are probably a lot of noises that are present but you just can't hear them over engine noise with the nhc250 but that you can hear with the 6cta

Maybe something is just loose and vibrating. I would get under there and start tugging on parts and see if anything is loose.

Does it sound like the air release groan when you engage the parking brake?

At 50 mph you may hear a noise from under the front coming from the underside.

It's hard to tell where the noise is coming from when you are in the cab at highway speed. Could it be the fan kicking in and the fan clutch is bad.