over heating 2001 5.9
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your problem will be with the cooling system. common problem is the PCV puts oil out into the catch bottle on the front of the motor, and if you don't empty that bottle every oil change like you are supposed to, then it fills up and overflows and then the cooling fan slings that oil all over the place and cakes up the radiator with it till it's completely blocked which causes an overheat.
other possibility is your thermostat is stuck closed which is rare unless its a non OEM t-stat in which case it is highly possible.
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vacuum lines to the front axle, or any vacuum leak in the system can cause enough vacuum loss to cause all sorts of vacuum related issues...
I have the lines for mine plugged off, and I use a posi-lok cable instead to manually engage the front axle from within the cab, which also gives me low range 2wd as an added bonus
I have the lines for mine plugged off, and I use a posi-lok cable instead to manually engage the front axle from within the cab, which also gives me low range 2wd as an added bonus