I have a 2010 Ford F-150 that has a grinding noise in front. It only happens when truck is warmed up and in gear. I only here it at about 1000 rpm and then it goes away. If I put it in gear and hold the brake while pressing the gas and let the rpm hover at 1000 rpm it clunks and grinds like crazy. If I do that for about 10 seconds and let off the gas it dam near stalls my truck. I had it at the shop and they replaced a tvt or tsp phaser ( can't remember exactly what it's called) maybe a cam phaser but it didn't go away. I haven't tried it in four wheel drive so I will try that tomorrow and see if it still does it. Any help would be appreciated.