no 4wd lights on switch and locked in 4wd

What is your question?

I just recently replaced the engine in my truck(6.0L) and the mechanic was very sloppy, and my 4wd indicator switches don't light up and in feel as though its locked in because it is hard to turn and the front drive shaft jumps when switching gears (P-D)and I had trans filter replaced too, what causes this and how can I fix it?