I need help trouble shooting a problem with my 07 DC 4wd 5.7l lb with 40k miles. I have noticed that a grinding sound similar to a dragging brake/bearing has been occuring whenever I turn. It is particularly loud when I make a right turn, even a gentle turn at 25mph or higher. I did check for obstructions, low tire pressure, lubed the springs so I can hear the noise better, added 1/2 qt of differential oil as it was low, tried 4wd, applied service brakes in the turn, applies e-brakes in turn. Nothing seems to change it.
I am certian it is towards the back of the truck. I did have $12k damage to the front end in December as a result of someone pulling out in front of me. I didn't have any frame damage, or damage to the truck past the front fenders/hood. So I don't think the accident has anything to do with the trouble. I do haul a 31' camper with a tongue weight of #900 and tow weight of about #7500. I do use a weight distribution hitch and air bags. We just got back from a 500 mile trip to NY finger lakes without trouble. But, now I think I heard the noise when we were towing the camper. At the time I dismissed it as noise coming from the hitch. I'm not sure though. Anyway, speed doesn't seem to change the noise except to make it louder. It can be heard on both sides of the truck but much louder on the drivers' side.
I did jack up the truck, tried to feel for bad bearings by wracking the wheels left/right and up/down. I also spun them but didn't hear anything unusual.
Any ideas what else to look for before heading to the dealer?