The 4 wheel drive light comes on unexpectedly while driving and vehicle shakes?

What is your question?

It started out with the esc light and abs lights on. The dealer told me it wouldnt hurt my vehicle but it would fix the lights if I paid 2100. Now whenever it rains, the 4 wheel drive light comes on and the vehicle will make loud noises and shake. Could it be the anti lock brake system causing the 4 wheel drive malfunction?? Right now it happens randomly, but usually when I encounter rain covered roads, and will eventually go off. The other day the steering wheel seemed to lock up, and it was hard to turn.