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Sounds like you will need to check the front axle vacuum actuator (should be located under the battery in the engine compartment) and clutch cable from there to the axle. If vacuum and cable are OK, you may need to replace the actuator or something has gone wrong in the transfer case .
If you have the push buttons on the dash board you must follow the instructions in your owners manual to return the transfer case to 2wd from neutral. I don't remember for sure but I think you must have the transmission in neutral, foot on brake, press and hold both 2wd and 4wdlow buttons at same time. My father who lives 45 miles from me has the Jimmy, I don't. Hope this helps, Jim
hey there i cant tell you what you are missing but i can tell you how to disengage the front wheels . ok you have a vacum line that runs right under the battery and a line that comes up from the front diff. to the same place ( you may have to remove batt and batt tray to get full access to this) un bolt it and temporaly put batt and batt tray back in start it up and decompress this and see if it comes out .... you should here clunking noise if it goes back in ... if thats the case just pull that big vaccum line off .... to test get all four tires off the ground and have some one put it in drive but dont hit the gas it should turn on its own ...if that dont work check the cable that runs down to the differental
Have you gotten a service light? Sometimes these electronic things just freak out. It might be as simple as a new switch. There is a motor on the transfer case that is responsable for moving the levers in the case that use to be done by a lever from inside the truck. I think it may be possible to remove this motor and replace it with a lever. I would check into this by calling a local 4x4 shop, or a mechanic that specializes in 4x4 vehicles.
A common problem for the Jimmys and the Blazers with electironic 4 wheel drive is for their to be a vacume leak in one of the lines. Try replaceing all vacume lines to any component on the 4 wheel drive. this should fix ya.
i found the problem it was the acuator on the side of transfer case so i took it off and manualy put it in 2 wheel drive now all i have to do is get under there and turn it with a tire iron thanks but got it under control......