I fixed a typo...
is inboard of first gear ID, chamfer against spline
, the comma in the wrong place maybe changed the meaning somewhat- sorry...
I'm no gearbox expert, and don't profess to be, just know what I've learned from my own misgivings...anyone can add their bits if I'm wrong.
Is the chamfer there to let the second gear pinion have that little extra travel?
..not quite sure what you mean, but I'd say it'd have marginally less travel, and as far as I'm aware the chamfer/bevel is just a relief to allow the T/washer to butt up to and seat square against the spline, to allow ideal end float for the first idler gear and allow it to engage the right amount with sliding 3rd ? gear(fairly sure)....and the thrust washer is in that position (inboard) so some gears don't mesh when they're not supposed to and go bang...
The second and third sliding gears obviously move together, but on each shaft independently- but you may be aware of most of that! ... ...whew...
disclaimer- "by my understanding of events'