If you are trying to shift above 6k, sell it and buy a t56 mag or race trans depending on your ideals. I put carbon fiber synchros in mine along with brass shift pads, and a 5.0 shifter. While it sharpened it up, it still liked to miss shifts. I was running an aluminum flywheel and 666 hp with a redline of 6800. The aluminum flywheel made it a lot worse due to the rapid rpm increase. I found that it would shift decent under full traction but any loss of grip would make it miss shift easily. Top of 2nd gear is a good place to lose traction on a track from my experience.
My opinion is that you will be throwing good money after bad....
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Todd
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