Ok, I went offroading yesterday and now I have a groaning/grinding noise coming from front end. I notice it when the motor is being torqued such as at takeoff or when accelerating up hill. The noise is worse in 4wd, but it appears the front axel is working (getting traction). Don't think its wheel bearings, they were recently repacked and tightened and no problems till today. Makes me think transfer case? Nothing appears to be binding, except the usual difficulty in turning in 4wd (normal). Any ideas? Anybody has a similar problem?

Mark