Todd,
When I ordered the TKO600 Extreme from Grey at American Powertrain, I called the Tremec Tech who does the modifications. Apparently there is a lot to do to make the 600 shift well above 6500 RPM -- polished syncros, hardened shift forks with brass pads, hand fitting of components, etc. Wish I could tell you how it works, but its still in the box. I do, however, have a new billet shifter from American Powertrain that you are welcome to try. I should be back in Vegas next week.
Pappy
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