The shifter might smooth things out a little by eliminatiing some slop (notice the adjustable throw stops), but I doubt it would do much to overcome the basic issues that are internal -- sycronizers and shift fork flex. I suspect that some (most) of the modifications to the TKO 600 Extreme are just "blueprinting" and polishing, much like you do to the internals of a good rear end. I bought the transmission for the hardened shafts and upgraded input shaft for the extra torque capacity. I opted for the 600 vice a T-56 to get the .82 fifth gear for road racing. I didn't want or need the deep ratio drops of the T56's 5th and 6th gears.
Pappy
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