With foot on brake,shift into neutral,then engage either 4 wheel high or low depending on your conditions. Remember you should not drive faster than 40 mph in either 4 wheel. When you want to shift back into 2 wheel,foot on brake then into neutral & back into 2 wheel.
Yukon should be the floor shift 4x4 put the vehicle in neutral and shift into 4x4 wait a few seconds and the light should come on.. if it doesnt come on put the vehicle in drive let the vehicle roll forward a few inches and put back in neutral .. you might have to do this a few times to get it to work ... also go from reverse to neutral if it doesnt work then the compnent on the front axle is usually bad ..
You can shift between 2Hi and 4Hi when the truck is moving. Just let off the gas and shift it. But in order to shift to Neutral or 4Lo you need to stop the truck and shift the transmission into neutral then shift the transfer case.
SOURCE: 93 GMC Yukon wont stay running
Put some lucas fuel system cleaner in the fuel tank check the plugs and wires and check the air filter and see if there is a bad smell like rotten eggs when you first start it. does it use a lot of gas
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