Re: Can I Disconnect my AWD on 00 Expedition?
One easy fix is to leave it in AWD. If anything it sounds like the TCCM (transfer case control module, located behind dash) is acting up, as it is responsible for changing the drive mode in the transfer case.
You won't see any mileage benefit between 2wd and AWD, as the front axle is still turning, the transfer case just doesn't have the front axle engaged.
You cannot leave it in 4HI as you'll bind the axles together making turns on any hard surface, and worst case is you'll grenade the front, or rear (if not both) differentials.
If you don't want to spend the cash to get the problem properly diagnosed, and with winter coming, leave it in AWD (NOT 4HI!) and you'll be fine.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!