I believe I know the problem, since the vacuum is kicking in the 4wd will work in reverse, my front tires spin in reverse, however 4wd will not kick in forward. I dont know what could have cause this. Does that fork grab two diffrent gears for forward and reverse?, if so I think I may have stripped out the forward one, which may explain the clicking noise. Can anyone guide me in the right direction? If so where do I get this part?

I dont understand the light comes on, the 4wd kicks in I can back any where I need to go. I saw the front wheels spinning in reverse. When i put it in forward, the front tires dont spin at all, and the 4wd blinks on and off fast. Apparently the vacuum works...

only one gear in the front axle

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91 f350 crew cab 12v cummins,nv4500 ,E/F shift handle w 2low and pacbreak switch, 4" straight pipe Dual 5" bullhauler stacks, Industrial injection 370 injectors and super phat shaft 62/71/14, #100 fuel plate, 4k GSK, ARP studs,60lb valve springs,custom 191 dv's, timing 16.5*,13" ceramic valair 6sp clutch, AFE intake, custom water/meth, custom air bags, 7 guages.