On your Jimmy you need to put it in 4 hi and up under the battery tray is the actuator for the front dif. make sure the vac hose going up to it has vacuum. if it doesn't then start tracking the hoses going down to the transfer case. one goes to the actuator, one to the vents on the transfer case and transmission and one goes back up to the vacuum canister, it's located on the hood on the drivers side. if the canister isn't getting vacuum then nothing is going to work. i just had to repair the hoses in the truck i put the trans in. the 4 wheel drive now works in it. i would have never know this, the hoses drop over by the exhaust and get hot and burnt and start cracking and breaking up and leaking. this can also cause some minor running problems. also. one last note. where the hoses attach on the transfer case. that connector has to go on correctly. it has a pin hole in it to line up on. if you put in on wrong things won't work.
SOURCE: 4x4 Problems
sorry lost here ,never seen one but if transmission shaft is turning to front diff then the problem is their,could be anyting from a sheared diff pinion to a broken planet wheel or possible evan a snapped half shaft or the spline on the end of the half shaft has worn and rounded off
SOURCE: four wheel won't engage
Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)
SOURCE: Front drive, 4 Wheel drive won't engage
Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel
SOURCE: 4wd will not engage on 2002 gmc sierra 1500
try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)
I’m happy to assist further over the phone at https://www.6ya.com/expert/john_2c7bb9c157d0baa8
SOURCE: Front wheels won't engage when in 4 wheel
Then the problem would be in the differential. something came loose or broke off the actuator on the inside
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