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One version of the TKO 600 is marketed with "road race" gear ratios. It's just better matched to engines with larger cams, extremely high rearend ratios, etc.
There has to be some significant work done to the TKOs for them to shift easily over 6000. We call it the "Sure Shift" upgrade. It includes disassembling the transmission, modifying the cones on the gears, installing better shift forks, different blocking rings, blueprinting endplays, etc.
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