4 Wheel Drive/SUVs: 1993 yukon 4 wheel drive problems, gmc yukon, ill family member

Question
When I lock my 1993 GMC yukon into 4 low or 4 high the front tires wont pull but the front drive shaft spins when in 4 high.

Answer
Chance, sorry for the delay I have had an ill family member so I wasnt able to get back to you right away Usually the problem is the actuator in the front end, I would take a test light and make sure you have juice going to it before replacing it though, it screws in the front end on the right side of the axle tube if you have any other questions let me know thanks alot for your patience ADAM