Bit late to see this now but I am in the middle toppof rebuilding the same box & noted exactly the same thing with the 5th/REV gear notches. The 5 notches faced the rev gear & not 5th. My first theory was that maybe someone had swapped the Hubs for the 3rd/4th gear which look identical. but doesn't help.
My conclusion now is that the manul is wrong wrt 5th/REV gear only.
The main point is that the side with the notches should align with the single slut in the hub. You can't actually turn the sleeve around anyway as they have master splines to the hub.
