I just bought a 2010 RT, automatic. I had the factory install headers and 3" exhaust (magnaflow). When I did a burn out with the esp off, the car left two tire tracks, like a posi. Mine came with the 3:06 rear ratio, I am wondering if a SRT rear differential will fit or from an RT with 6spd transmission. I would do it to get the higher gear ratio. Any advise?