CRT.5 motor choice ?

[Mazimbwe]

I have an OS.18tz in my CRT.5 with a 14T CB and the wheels come right up when I mash the throttle on take off. I will be adding some different fluids to the diffs that should help but even a nice little .12 will make this Truck fly.
The 2.5 should be handfull enough for most people...the Truck can handle it mate, she's tough. ;)