7955's for both on straight 7.4 Lipo. Hitec told me the 7955's are just as capable of running 7.4v as the 40,45, etc, without issue. They just dont advertise that they are. Massive torque,Titanium gears, and .12 transit speed(on 7.4v) is more than fast enough. A bonus as well is you only need to carry one back up. I just think its the best all around bang for your buck