those are nice, but wicked pricey! i have also considered a wheelyking axle for a project i would like to do.(front engine, rear drive with no tranny) but even those cost a fair amount.

i had a wheely king that i modded to a crawler once. i had a 55t motor, geared low, diffs locked. i did eventually snap something in the axle, but that only happened when both front wheels were stuck and COULD NOT MOVED, yet i gave it full power. now, that motor put alot of torque on the axle before it broke. so, i would be willing to bet they could handle some serious speed. i know there are some vids on youtube of wheely kings with brushless motors on them(for speed, not crawling)