Thanks skellyo. I knew someone would know. And if the flm's are working on 4s for Brian, they should hold up for me. Sweet.
FWIW, I've got Traxxas steel output yokes on stock sliders and they're holding up to 4S with a Medusa 36-60-2000. That's also with running buggy tires/wheels (Badlands knockoffs from eBay).