02 grand Cherokee 4wd not working, front wheels not turning in snow

SOURCE: Service 4 Wheel Drive Switch

this seems to be because either the connection to the solenoid is loose or faulty or the solenoid is not activating. the transmission control module sends a signal to the solenoid to activate it. you get the light because the ecm detected that there is a a problem with the circuit. this is due to the fact that there is a voltage value to the solenoid and it is out of operating parameters

SOURCE: steering wheel is locked on 2001 jeep grand cherokee laredo

try gently rocking wheel back an forth while wiggling the key

SOURCE: front axle does not engage when I shift into 4wd

It sounds like maybe your auto lockers in your front wheel hubs are not locking. You may be able to get them to lock if while in 4x4 you jab your brake pedal several times, sometimes this will work to get them to engage but even if this works I would advise that you either invest in a good set of manual locking hubs or replace the ones you have with new auto lockers. The auto locking 4x4 hubs are great when they work but when they don't they are not serviceable. The manual lockers are allot less likely to fail on you in the future.

SOURCE: How to shift a 1998 jeep grand cherokee into 4 wheel drive

Four low is almost never used. I use it on very steep rocky or muddy trails in the woods or to pull someone out of mud or a ditch. Though some will shift standing still it is best do do this while rolling. Four high can be shifted at low speeds of 2 to about 35mph (higher also but not really good idea) Low can only be shifted between 2 to 10mph. If you find yourself stuck and unable to shift because you aren't rolling you can also turn the engine off, engage the transfer case and re-start. That avoids having the gears clashing together. Best rule is if it begins to grind, don't force it.

SOURCE: 1998 Jeep Grand Cherokee Laredo 4WD with loose steering

Did you tell the shop to do this or did they find something wrong with those parts? "wheel bushings" ??? Are you talking about hub bearings or ball joints? Bad ball joints can give you wandering or a really bad shake (called death wobble). Has anyone checked the steering box to be sure it hasn't started to tear off the chassis? Is it internally worn? There are too many parts up there that can make a noise for me to comment intelligently about that. If there, I'd need to test drive it. Check the steering damper (sideways shock that attaches to the steering linkage. that can allow wander over bumps. Also, adding alignment caster (more than factory setting) will tend to stabilize the front end. I run way more than factory setting on all of mine. It can wear the steering pump, but it only takes about a year off it's normal life if even that much.
So, you may get nine years from it instead of ten.
I hope at least one item I've mentioned helps you. If you don't understand any part of this or have a question, just ask!!