Kind of funny, the first hex I ever spun out was a 14mm on my aftershock. They were smaller t-maxx wheels though.
I spun one out before that, but it wasn't from driving it, it was from trying to remove the cross threaded wheel nut.
Yeah, I replaced all the 4-40 stuff with metric when I had mine. Was annoying trying to keep the screws straight between that truck and all my others that used metric.
This guy had it back in the day:
https://www.rctalk.com/forum/threads/my-lst-2-build.59566/post-592967
I may have had it on my aftershock... can't recall. I don't remember the significance of it. I always ran smaller tires/wheels on it than stock and I stuck with the stock Z590M servos I think...
What wheels/tires do you intend on going with? That will play a part as to what engine you run. The large losi wheels/tires take a lot of grunt to get moving. I always ran smaller traxxas 3.8" sized wheels on mine. I started with 3.2" traxxas chevrons and losi zombimaxx tires. With the gear flip...