Which BEC do I need??

[T-Bro]

I'm in alabama at my family reunion and my truck is at home since it's been acting up... I can take one and post it when I get back home for sure. Till then I'll tell you I first had it mounted on the side of my esc (I know dumb) lol. It's now on the chassis where one of the battery packs sit. I just know I have far too much money in this truck for it to be flipping like a acrobat on it's own! I really need to find out specifically what the problem is because I won't be running it anymore until I do.
p.s. my other vehicles are running fine with the same remote 3pk. The last thing I can think of is that I just had to send my radio in to be serviced. The throttle reading was waaaaay of so they had to repair that for me. I keep wondering if that has anything to do with it though I highly doubt it.