I do not run it as 4S, but I have it for better durability. Well, to be honest...I was in a haze running heavy ass-belted tires, and it was eating the spur/input gears and driveshaft and killing the rear diff. After changing all the to metal rear diff, metal input, and metal spur, I am out of the haze (it was fine there no more issues). I went back to stock 2.8 tires non-belted and have been enjoying it since and bought a 6S rig to do the real deal.