I could be wrong.... but I don't think this gearbox is straight cut gears, it's dog change. Dog change is a different style of engagement (most manual's are synchro). Dog change are more widely spaced engagement teeth on the gear and selector hubs to help with shifting at high rpm's. Done correctly you can shift faster because you are matching the rpm's of the gears and you are not relying on the synchros to match rpms which takes time.
You can still miss shift and beat the dogs up, but they are thicker than the synchro teeth and can take some abuse. The dog teeth are back cut so when you are on power they are locked together. When you don't match rpm's correctly you damage the leading edge of the back cut which if it gets bad enough (effectively ruining the back cut) allows the dogs to slip apart causing the trans to slip out of gear.
Sounds like a sweet setup! ....did you get it from racingjunk? I was looking for more info on the trans and found a wanted ad for one there.
-Dave
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