Does anyone know the specs on a Promax 400 6v motor? I've read HL's require a 3amp draw to avoid cooking the FETs. Will this motor work?

doubt it. the lower the voltage, the higher the amps. What is your application?

I'm taking them back, they have an 1 amp higher draw than the Graupners. Just ordered a pair of the 7.2v and hope they get here relatively quick. Thanks Swath for the reply and making me feel the need to upgrade my Bulldog's motors in the first place. Is your metal gearbox standard in your Dog?

Yes, just regular Heng Long upgrade, well broken in with lots of grease!