97' Tahoe beep noise? Turbocharger?
 

I've had this problem since I got the truck. When I accelerate from a stop, conditions don't matter, there is a predomidant beep from the rear. My dad is a mechanic and cant seem to find it, and I was just wondering if this is a known problem. And I was also wondering if there is a turbocharger for this truck? I know theres a supercharger. Any help would be appreciated, thanks!