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unlock your front brakes first. if it's front wheel drive, with locked front brakes, it would shift but wont run or you burn your transmission clutch. if it is not front wheel drive, if transmission shifts, rear wheels should turn or spin.
I would guess your differential. Raise your rear end and try rotating wheel, it should make the other wheel spin the opposite direction. I'd the other wheel doesn't spin, I would say it's your differential.
either brakes are seized or the wheel bearing is seized. most likely the brakes are what seizes up. just jackup, and take tire off to check it out. it maybe a stuck brake, rust or dirt, or maybe a broken spring or two. good- day ! but first reach in back of tire and pull on the e-brake cable a few times at the problem wheel, it may be binding.
Check the transfer case. Put a jack under the rear axle and jack up the rear wheels. Have a helper put in 4 wheel and the trans in drive. Have him/her ease off the brake and see if the rear wheels spin. If they spin, 4x4 isn't working. If the truck tries to pull forward with the rear wheels up then it works. Now, if the rear wheels are spinning carefully look under the truck and see if the front driveshaft is spinning along with the rear driveshaft. If the front shaft is spinning then it is an axle problem. If the front shaft is not spinning then it is a transfer case problem. GM has a problem with the NP263 case.
If the Tires wont spin then it isnt locked in. If it really is engaged like you think it is and they dont turn then something is broken in the differential. If that was the case then it should be makeing lots of noise. Now it is very very common for the electro-mechanical device that engages the the 4wheel drive at the differential to go bad. If you look at the front differential you cant miss the 4 wheel drive actuator. It has a couple wires that come out and plug into the wiring harness. Usually if this part fails I understand the 4wheel drive indicator lights wont come on? I could be wrong on that. My sub is 3 years older and that was the case with it.
If your tires are on the ground the drive shaft wont spin, it sounds like your push button is either not connected or the one in the transfer case is jamed
The only Solution to this is 1 of 2 Things ! The Shifter Linkage is Off of the Transfer Case 2 The Transfer Case is Shelled out and needs to be Rebuilt. Check underneath on the Transfer case for any Noises when in 4X4 and Check the Linkages. Please Rate my Response, I need all the Help That I can Get! Thanks!
first off your heater dial swithc is buggered. and as for the four wheel drive is it all electric diff locks or do you have to get out and lock hubs in etc?
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