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It's just my opinion but I would look into G Force gearsthat arestraight cut and havedog ring engagement. Turning a syncronized transmission 6500+ it's going to be easy to miss a gear unless you aren't going to power shift. If you are going to power shift everytime you miss a gear at 7000 rpm more than likely you are going to have to put a blocker ring on that gear. I've been there and done that with a Toploader and a Muncie.