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Originally Posted by BThibodeaux
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. . . . The T56 requires transmission tunnel modifications due to it's larger size. The TKO does not.
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Viper sixth gear is 0.5:1, not .62, so there is about a 20% difference in top gear and a significant potential fuel economy advantage for the 6 speed. I did not have to modify the transmission tunnel on my '68 for the T56; maybe '69's are different.