WOW!!! I didnt think of that!! Does it need to stay in 4H? unless mudding?
I really know nothing about 4x4's...I know I have some issues with the vaccums. It wont switch from 4 to 2 wheel drive.. Also, there is a 5/8?? hose coming from the top of the front axle, and I'm not sure where it goes..
If your Jeep is a quadatrac then it is a full time 4x4. and was meant to be driven in 4x4. The lever under the driver seat is for low/neutral/high gears. Use high gear for everday driving. the switch in the glove box is used for locking the front and rear together and only to be used if on slick surface. As for the hose going to the front diff it may be for a vent.
The '90 model will have 727 trans and 229 transfer case. It has 2H, 4H, N, 4L. The front differential has a vacuum operated locker. If it is not working, you will only have 2wd, but the truck will still move with power to rear axle. The hose you are talking about is an axle vent and should have a vent plug in the end. It should have a clip on it that attaches to the lower radiator bolt.
Try this... chock the front tires and lift both rear wheels clear of ground and see if you can turn them by hand with the trans in park. You should not be able to turn them with the transmission in park. If you can, then try putting t-case in different range.
No vacuum front axle (it's solid because after '86 they became shift on the fly. Easy to spot because they don't have the pin that takes 2 hands to switch from 2wd to 4wd or vice versa), no vacuum operated locker (from the factory) in '90. I agree the tcase is likely bumped into neutral. With the truck not running, pull up the floor lever and see if it goes! (2wd is all the way up or all the way down, depending which tcase)
ok...the transfer case was in neutal. Its still to working ok...I just dropped the pan and replaced the filter, going to put new fluid in tomorrow.
I did jack the rear up, it didnt move in park. Also, I jacked the front and when I turned one wheel, the other turned to opposite way. I am beginning o think that I will be driving on 4x4 always, or until I get the vaccum lines fixed.
Do you have any suggestions of where I may get a vent plug???