Thanks! Looking forward to racing with you all and hopefully improve with all the great knowledge around here!
Regarding 7T pinion I will wait for Jim's response. Reason I ask is that I tested a PN delrin 7T pinion and it was a lot quieter than the stock one.
for box stock it must be a 7t pinion 48p. As long as it is a 7t u can use any make that u want and it must be stock gear diff not a ball diff of the same tooth count