Hello , have a 2000 dodge ram 1500 5.9 liter 4x4 truck 200k in great shape , today went to shift to 4 H. and it would not go on 4H. however in 4L. it engages fine and 4x4 works great , on the dashboard it tell me 4 wheel drive and wheels are locking good no question on it it is engaged but the lever will not go from 2h to 4 h tried moving while shifting ,took batery of for 5 minutes so computer would reset , looked under the truck and lever is tight and moving freely please let me know what else to check for , I am not to savy on 4x4 ,thanks in advance

 

something is boo-foodled in the t-case, and blocking the shift. try engine not running, go through all shift patterns back and forth, to see if you can shake it loose.

 

Don't you have to be in neutral to shift into either 4L or 4H?

 

with engine running, transmission should be in neutral for shifting in/out of 4L. you can shift in/out of 4hi while in gear (supposedly up to 55 mph) because it has synchronizers.

with engine off, it doesn't matter.

also, battery and computer is not involved, other than the 4wd indicator light in dash. its all purely mechanical.

 

Ok I thought maybe computer had something to do with it , i will see tomorrow, been reading a lot about the issue iwill check for vacuum hoses and the overall stuff , will run it on the road see what happens . I will let you know what is the outcome , thank you all

 

hello Update : went out inspected hose vac. good vac on one no vac on second hose, on either side trany and cad. side tubes for vac great , however today the truck is not going on 4x4 for sure , and no indication on dashboard , lever on floor is going in 4l. but not in 4h. tried moving it around stop position while running no difference it will not go on 4h.

 

Disconnect the shift linkage from the transfer case and attempt to manually shift it. It's much more likely that the shift linkage is out of adjustment or binding up than something being damaged in the transfer case.

 

Ok. I will try that today we might have been pressing on it more than usual , i will update later on today , thanks again

 

Your situation sounds VERY wired. I don't understand how you can get into 4 lo. The only way to engage 4 lo is by having the trans in neutral, be under 5 MPH and go from 4 hi to 4 lo in a smooth motion and not stopping in the neutral on the t-case. If your truck is going to straight 4 lo then you have a real problem. Even the electronic 4x4's like my wife Tundra is the same thing. You engage 4 hi, put it in neutral, and then press 4 lo. It cannot go from 2 hi to 4 lo, it would destroy the transfer case.

 

Could you please explain how this would destroy the transfer case? There is no reason you must be in 4 high before shifting to 4 low.