If your year/model truck has the push buttons on the dash to engage the 4x4 check to see if the 4x4 button is stuck in. Bump the dash panel with your hand or try to gently pry it out if it is stuck.
A Chevrolet Tracker.
If your Polaris Magnum 325 won't disengage from 4x4, it could be due to several reasons. Common issues include a stuck or faulty shift lever, a malfunctioning actuator, or problems with the linkage. Additionally, if the vehicle is under load or on uneven terrain, it may be difficult for the system to switch. Checking for any physical obstructions or ensuring the vehicle is on level ground may help resolve the issue.
To disengage the 4x4 system in a vehicle, first ensure the vehicle is at a complete stop. Depending on the system, either shift the transfer case lever to the 2WD position or press the appropriate button or switch for disengaging 4x4. After engaging the 2WD mode, you may need to drive a short distance for the system to fully disengage. Always consult your vehicle's owner manual for specific instructions, as procedures can vary by make and model.
Your Switch migh be bad
If they are vacuum operated then it could be the hubs.
No, not even close
Your rear axle is probably out. This would explain it moving in 4x4 because its utilizing the front axle.
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It has 12
While it is possible with a spindle drop....Why would you want to drop a 4x4 truck?
One could buy a Chevy 1500 4x4 at one's local Chevrolet dealership. Chevrolet dealerships can be found from the Chevrolet official website. This involves inserting one's zip code.
After you disengage put it in reverse and back up at a 90 degree angle. I own a 93 and have the same problem. This usually does the trick.