Re: 2003 ford f-150 4wd problems
It's more than likely the TCCM, or transfer case control module. I'd shop around and find a used unit. RockAuto and car-part.com are good sources to look for a TCCM in your area. Not everyone calls it that, it's just a generalized term that MOST people should know. A bad TCCM can lead to no engagement and disengagement of the transfer case. I'm sure the transfer case itself is OK, but I wouldn't use it unless absolutely necessary until you get it fixed, or in this case, replaced. Stay away from dealers as they'll charge $500+ for a new TCCM. A used one should run you around $100 or so, and it can last just as long, if not longer than a new unit. Shop around.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!