Looks like that speedo needs some help!
Charlie laid that one out pretty well. Working on these trannies isn't just about the expense of the tools, it's also something of an art. We're talking about tolerances that aren't easily measured, along with shims that might not be the same thickness at all points, variations in temperature that changes tolerances, compressability of gaskets, and on and on.
That's not to try to discourage you, just be aware these things aren't a walk in the park. Getting the tools is only the first hurdle.
The updated shifting mechanism has more defined and bigger peaks that help prevent the roller from hanging up between gears. I could tell by looking at the ramps which one it is.