My 2004 dodge durango has that knob where it says awd 4lock and 4lo now my truck is stuck blinking 4 lo and it drives like if its stuck

On that vehicle the wheel sensors control the four wheel drive with is nothing but traction control if the sensor are bad it can lock in and not come out the transfer Case has a solenoid on it also the toggles it it also can be stuck I would start bye checking relays first and move from there hope this helps

The vehicle is always in AWD and that cannot be altered . There is a 3rd diff in the gear box that allows independent operation of the front and rear wheels to prevent drive line wind up . When you select 4WD you lock up that 3rd diff so that both front and rear axles have to turn. This results in drive line torque wind up so the vehicle must not be driven in this mode on hard surfaces as there is no means for the wheels to slip and relieve the torque wind up . To loose the wind up reverse for several yards and any actuators that are trying to move will be able to or drive on slippery surfaces to allow the wheels to slip

This problem and similar ones are being reported on a daily basis. Dodge reports that the problem lies with the transfer case motor. I suggest that you have the dealer take a look since this is probably a fix that will be done on Chrysler's nickel.

iam having same problem it keeps switching from 4hi to 4low and when trucks off can hear it switchin even when trucks off hear it switching

That maybe the case however I would check to make sure the linkage from the 4wd shifter did not pop out from the transfer case first.

there are 2 systems.
one is a part time system only.the 4x4 locks and is for ice mud and snow.Driving full time will damage the transfer case.The other system is a full time system and the selector says 2wd,4wd part time ,4wd full time and 4 lo. if in full time,it can be driven all the time even on dry roads.The full time is really an all wheel drive system.
the 4low is a very low gear and the main shifter has to be put in neutral and then the transfer case put in 4 low.attempting to put it in 4 low while in "drive" will make a gear grinding noise.
getting out of 4 low is the opposite.shifter to neutral and then put it in 2wd and then in drive.The newer durango has an electronic transfer case with a dial on the dash.The 2002 was available with 2wd,4wd,awd and 4 lo on a switch.The 1999 has the lever on the floor .

Awd is on demand 4wd, better fuel economy
4wd high is locked in high range
4wd low is lock in low range

your high low range shift solenoid is out!! change it!

come to a complete stop put vehicle in neutral than shift from awd to 4lo also do the same when going back from 4lo to awd

might have a bad o2 sensor wich is tripping your check engine light and a vacuum leak wich is causing your 4lo 4 high light to blink