I have a 1994 S-10... A sound has come to my attention that concerns me....I have also apparently lost some fluid somewhere.... It sounds like a rubbing/vibrating, and "feels" like its holding the truck back... I hear it most of the time, but have noticed that I DON'T hear it when the tranny is not being worked (coasting downhill/coasting level) VERY bad when going uphill.... This is in 2 wd....4 wd WILL engage... I've never taken my front end apart before, but I don't mind giving it a go... I have the manual... Any insight into what this might likely be? Thanx!