I cant totally hear where its coming from. But its sounds like either the engine, or the exhaust is making a tinging sound when i hit the gas. It has to be in gear and moving for it to make the sound.
It happened pretty soon after i got my t-lok and 4.10s put in.
It put it up on a lift (weight of it on the wheels) so i could check to see if the exhaust was touching anything or close to anything. And it is on there pretty solid and has a good amount of clearance all around.
* btw, it sounds like metal on metal
Can you explain the noise better? Is it a constant noise or on and off? I agree with the others, if you can get it on the lift again check the driveshaft / joints and the rear end area/ brakes