I bought a 99 GT used from a dealer, and we think it may have aftermarket gears, but we arent sure. Is it normal for a basically stock 99 GT to spin the tires like mad on a turn, dry pavement, Nitto 245/45 555's, and a BBK cold air intake. I was turning a left turn in 2nd gear, slowed down to like 15-20 mph, nailed it, tires just started spinning all over the place and the rear end went out from behind me. I've asked a few other GT owners and they said they could only do that when it is wet. Any idears?