The 5th gear ratio in the TKO 600 is .64, and the sixth gear ratio in the T56 is .62; so they are essentially the same. Therefore, mileage and drivability is not the issue on the highway. Both transmissions shift really nicely. Both are very strong. The T56 requires transmission tunnel modifications due to it's larger size. The TKO does not. I had a T56 in my first 69, and am going with the TKO in the one I am currently building. For me, 6 gears were a bit much. I also like the idea of not having to make the tunnel modifications.
Good luck,
BT
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