I run my ext. crt.5 on a damp clay track(indoor). I run 3/5/1 and my motor is a mega ACn car 4580kv with 2s trakpowers. It runs real good when my servo saver isn't broken It does push a little when under power, but from playing around with the diff oil, it does not seem like I could dial it out. The thing is that if I go with a lighter diff oil, I balloon the front tires and loose traction. My back end doesn't really swing out or spin out(I am running losi pink taper pins in the front and pink kingpins in the rear).

Hope this helps!
Bye