just installed BL-WOW-now problem

[tha5150]

a cut of hex wrench huh. i am assuming once i see what this pin is, i can match it up to get the size and go from there. but there is more to bulletproofing the tranny than this..

all i have done to the tranny is added the steel idler gears. i dont want 1st but i dont know how to convert it to 2nd gear only. i have looked for a write up and found nothing.

one more thing, what else should i do, within price reasoning, to bulletprooof the tranny?