When I put my truck in 4 wheel, there is grinding and when i take it out of 4 wheel, it seems like it doesn't wanna release anything and there is more grinding. Trying to figure outwhat is causing this. I've changed the fluids in the transfer, front differencial, and added grease to the hubs. my truck is a 93 with a 4.9.

 

Are you putting it into 4WD while in motion?