I have a Durango dex210. 99% sure we have the same internal gear ratio. I did with the previous gen AE cars. I run a 10.5 turn with 30/81 gearing and I am not fast enough down the straight on the open 8th scale shared track I race on. I could get there with a smaller spur which I don't have yet. I am running 140 in 20 Celsius weather.