there's probably nothing special about it at all.
i don't know the exact data on the new one, but most 6 speeds only have one overdrive gear like other trannys. (if it has 2 overdrives, thats awesome) overdrive might be a little steeper than others. it just means there are more gears to climb through (pain in the butt), but the gears can be made at closer ratios (good) which can help you keep the motor in the power band.
it also does not necessarily make it stronger. only superior construction and design will do that. M-21 and M-22s from the 60s are examples of this.
and for anyone thinking about jumping all over me - i did not say it is a close or wide ratio tranny. that is another story.
4speeds.com has some good info on trannys basics for you.
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