ORIGINAL: Foxy
You are going to spend more than 25 bucks on just the BEC you will need to run a 400oz-in servo. What you ask is completely impossible.
If I were you nitrosports, I'd try to find a way to make a large scale servo fit. The HS805BB for example, but you're still gonna need a BEC for a servo that strong in a crawler.
that would be sweet.
but a decent 1/5 servo is well over $50, correct?
If I run a 2s lipo pack to power the rx, and remove the red wire on the esc plug, then that should keep the servo's power at max no matter what the esc does.