2012polairs ranger 500 efi 4x4 will not drive front wheels in forward.will drive front wheels in reverse

SOURCE: 88 4x4 ranger won't go into 4x4

check to see if the drive shaft is turning if so the problem is with the hubs or differnal

SOURCE: 1999 4x4 ranger comes out of four wheel drive

Put manual lockers in it. And remember, you have to back up 50 feet to lock in the hubs, automatic or manual. Not doing this could cause your problem.
Calvin the Mobile Mechanic

SOURCE: 1987 Ford Ranger stuck in 4 wheel drive!!

Chances are the linkage for the transfer case is out of adjustment try loosening the adjuster bolt and put the 4WD shifter into the position 4WD high or low (depending upon which position it's lockup in) then lock down the adjuster bolt, try to shift out of 4wd sometimes you need to go forward and backward with the vehicle to get it out of 4wd, when you get it out of 4wd you may have to fine tune the adjustment to get it to engage and disengage smoothly it's a trial and error thing keep resetting adjuster until you get the desired effect.

SOURCE: My 2004 ford ranger xlt 4x4 won't go into any

Sounds like the forward clutches and/or low-reverse one-way clutch. Either way it sounds like it's time for an overhaul

SOURCE: my 2002 chevy silverado 4x4 will not disengage

The issue is usually loaded gears. The secret is to try circles, one way and then the other. This preload is why 4x4 is supposed to be used on loose surfaces....The gears will disengauge after they unload.