If you really mean lockers and not hubs, just engage the lever to shift into 4wd. Locking hubs are at the ends of the front axle in the center of the wheel. you can run with the hubs locked and the transfer case in 2wd for short distances, but you should lock in the hubs before you need them and when you expect to need them soon. Then all you have to do when you need 4wd is shift the transfer case into 4Hi. When shifting from 2Hi to 4HI, you should be traveling straight and no more than the recommended speed listed on the sticker on the sun visor or in you owners manual, and you should not use 4wd on dry pavement (wheels need to slip a bit to go around corners without binding the driveline). DO NOT shift into 4Lo unless you are completely stopped, however.
True lockers lock the differential in each axle to lock each side together, and should only be used for serious wheeling or serious need for traction, except never on ice.
Leaving the hubs locked (transfer case in 2Hi) in just makes it harder to steer, causes a minimal increase in wear, and drops you MPG a bit by forcing the entire front end to turn instead of just the hubs. You may have auto hubs, if so disregard hub info.
+ what Muffhugger said. Thumbs up!
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