Hi guys , my truck makes a weired vibration and a sound at the same time i feel the vibration on my steering wheel and brake pedal it happens when the truck is between 500-650 ish rpm when im nearly at a complete stop or reversing it comes from the driver side in the front i took it to the dealer 3 times they couldnt figure it out they changed my engine mounts and re bolted the exhaust bolts the they said its normal because the did not know how to fix its driving me crazy ! Please help its a 2014 1500 5.7