haha if I had a t56 i wouldn't have topend issues. Sadly I've got a 4l60e due to money, i picked up my 60e for $550 from a forum member, and the cheapest semi-local t56 i found was $1500. With the extra 2 gears the gear ratio's work out well, but the 4 doesn't quite cut it, plus I don't think it's going into overdrive cause the tune isn't calibrated for tire size or gear ratio.