Just went to try the 4WD on my truck this morning on the beach, and now i can hear a grinding kinda noise when heavy load applied to front drivetrain. If i drive normal,it wont happen or almost never but when i gave her 3/4- full throttle in 4LO it will make that scary grindind noise coming from front end In 4HI it's little better t'ill i floor it. Must be cause more torque gettin there in 4LO... Here's the front end known condition: new ball joints, new u-joints(hub ones), little bit of slack between yoke and u-joint, and for the rest I donno; never got the front cover off yet. So if any of you guys ever went thru somethin similar: could ya give me an idea what to look at or to fix???