Posibilites:
Blown rear differential, when the front wheels go around does the rear drive shaft?
Blown transfer case: Same test as above but the rear drive shaft does not spin.
Is there a rear drive shaft? ( I have seen this ) Customer damaged the Rear "U" joint off road and rear drive shaft fell out with out driver knowing.
Put the vehicle into 4WD? It should move on the basis of the traction of the front wheels. The rear wheels should simply free-wheel. Am I wrong?
you should try to poo in it
Take it to a mechanic. If you are asking that question on this forum then it is too complicated for you and you could mess up a lot of stuff if you do it wrong.
If the Actuator was not working then the front wheels would not pull at all.There is nothing wrong with your truck or the 4x4 SYSTEM.No Factory 4x4 truck has positive traction in the front, what you are complaining about is normal, both front wheels don't pull at the same time. They switch back and fourth, and it makes it fill funny, The steering wheel jerks around.YOU HAVE NO PROBLEMS. NEUTZ
Could be in need of a tune up.
the oil failed and made something wrong
No they were two different models. Sorry but the above answer is wrong. Those hoods are the same and will interchange. The body design change took place in 1988
You are probably in four wheel drive. With the front wheels engaged on dry pavement you will notice difficulty in steering and the truck will handle poorly.
Does it have manual lockouts on the front hubs? Center of the wheel/axle turns to lock the wheels in.
Check for a blown fuse.
Need to know what is wrong with it to answer that question.
That depends on if there is a front axle disconnect. Your problem could be with a switch that tells the front axle to engauge.