My 4wd wont work. I tested the driveshaft while the truck was offf. When I shift into 4wd and check the driveshaft it locks in and wont turn. When I shift back into 2wd it spins freely. But when the truck is running and I shift into 4wd the front tires will not turn and the light will not come on. Anyone have any ideas on what may be the problem?

 

I have the same problem, the rear LSD lock does not work either.