Ltutt1

I hope someone can help me figure this problem out I have a 1988 gmc v1500 surburban serria classic it has a 350 engine a/c.the 4wd doesn’t work everyone I talk to says check the actuator on the front axle,it doesn’t have or is there a place for one,when I put it in 4wd the light comes on,I got underneath and everything is hooked up,now when I bought the truck the lady l bought it from said they took a gear out,so it wouldn’t work any help is appreciated thks