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A 4 WD.is not meant to drive in four wheal drive unless on slippery surface like mud, ice, etc. the front drive wont slip like an AWD and will cause a bind if the wheals don't slip to take out the built up torque. This can damage the front lock hubs. Try it off road and see if it still dose it.
You have a transfer case actuator and a transfer case module,The easiest one to inspect for bad connection is the the transfer case actuator,you will need a 12 volt test light and check for power,what year do you have and do you have automatic transmission or manual
the problem on that year of the pick up if the abs sistem is not working right the rear weels lock up with just touchin the brake pedal there are three sensors one on the rear end and one on each front weel most of the time the front sensors get dirty and that afect the sistem that truck is runing 13 year time to clean those sensors the one on the rear end had to be clean wen you change the oil
check on the frontend, some of the chevys have an electricl controlled vaccum actuator that locks the frontend in, it will be close to the punkin. if the vaccum line is off or has a hole in it, it will not engauge in 4 wheel drive. hope this helps
Unless you have a positraction rear differential, I'm surprised that even three are turning! Four wheel drive is really two wheel drive because both differentials are "open" type. In an open diff, only one wheel has power at any given time. With a positraction, or "limited slip" rear diff, both rear wheels push with fairly even force but the outer wheel is allowed to slip when going around turns. Only true four wheelers have either a limited slip on both ends or "locked" units but it is impossible or really difficult to drive anything like that on the street. If you hold the left front wheel from turning unless the locking unit is broken, the right front should turn.
actually if my memorie is good the lignt indicate fwd for four weel drive ) and not (front weel drive) how ever ,you could look in the fuse box ,there should be a space to insert a fuse in order to release the rear traction ...but i do not recomand you to drive it all time like that ,not to good !
The malfunctioning part in my case is what ford calls the "integrated wheel end" which locs the weel hub on the four wheel drive in or out as need. Part is available from Ford and cost about $110.00. I will do this repair myself.