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Originally Posted by coalitionSE-L
I'm still a little confused about exactly how this transmission engages reverse, but I'm not going to lose sleep over it. Anyhow, I've edited the original post with the "proper" terminology for this gear.
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Ok after staring at it for quite some time along with the FAST system, I see how reverse works. Reverse shares a slider with fifth and reverse. I have never seen a manual tranny with a synchro for reverse. Kind of cool. In the B13/B14 tranny when you shift into reverse all the sliders go neutral and the reverse idler is pushed up to engage the slider for 1st and 2nd which has mating straight cut teeth. So the B13/B14 tranny has a slider for 1st/2nd, 3rd/4th and 5th. This one instead adds to the '5th gear slider' making it a 5th/Reverse slider. Having a helical reverse is also odd as it will be as quiet as the other gears, i.e. no whirrrrrrrrrring when you back up as B13/B14.
The reverse idler gear gets pretty beat up on the side because of way it forces itself up to mesh the other two gears it contacts, so this is a improvement in 4 ways:
1. Reverse is quieter. (not a big thing but of note)
2. Reverse will be easier to shift into from a stop.
3. It braces the input shaft as noted before.
4. The idler gear will not wear like before.
