that problem of hanging gears was solved on my 1957 TO-35 when I finally learned:
do not, do not, do not ever pull up on the shifter lever when you are shifting gears.
you have to train yourself not to do this, just take your time shifting.
practicing this procedure has worked for me for many years now.
you just can not sling and blow and jam gears in these old girls like you can in a new tractor,