That is normal. The front axel and driveshaft and are always engaged
however disengaged at the diffrential until put into 4WD mode.
The constant wear on those parts are the cost of being able to go to 4WD
without leaving the cab. Not to mention a considerable loss of gas milige
when in 2WD.
I have put locking hubs on my truck to avoid this but have to manually lock
the front wheels before going to 4WD.
I used Waren locking hubs, other makers are available.
Contact dealer if you go this route to check on warantee.
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