My 9.5 Dynamic works nicely in my 63 behind my 493. It drives great all the time as I can cruise the back roads at 2200 rpm and I don't notice any slippage just like when I drive the highway at 60 mph it just drives great all the time. It flashes to about 4000 or so at the track and works ok for my mild street car. I can hit it at any rpm when driving it and its always right there and just never seems to sound like its slipping any to me at any speed I drive. Its been in my car since 2006 as it was actually built for my old 440 but I am very pleased with it. Ron