I actually liked the ratios in the TKO I had but the delayed shifts are what ended it's place under the car in 15 minutes. The T56s are night and day difference but take some pretty dramatic surgery to install. I can easily and quickly shift at any rpm (I don't push mine past 6,000 rpm) and have had zero issues at all with the performance. Mine was out of a 03 Viper with 17.000 miles on it and only cost me $1,500, the down side is the .5 6th gear ratio. I'm running 4:30s at the moment which is great for cruising making takeoffs effortless and 70 mph cruising coming out to 1,900 rpm on the freeway but I don't like it for hammering on it (can't shift fast enough). I'll be looking into swapping the 5th and 6th gear ratios.