After having wanted a crawler for a couple years, I broke down and bought a Wheelie King a few weeks ago. Just for kicks I removed all of the electronics from it and installed a Johnson 550 12v motor, EVX, a 2s 6400mah Lipo, and my radio (so I can sell all the stock stuff as "brand new"). The thing did wheelie like a "King", but couldn't do anything else. At that point I took the whole truck apart, with the axles separated from the chassis. I will only be using the axles and possibly the shocks, as the chassis is quite worthless (except I will be using 4 holes from it as a template). Here's what I am planning to use:
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KMS 2826/06 14pole 730kv brushless motor (I work there, so I got it for a better price)
-2s A123 mounted to the front axle (had a couple cells left over from my 4s2p pack)
-Wheelie King axles
-Mamba Max ESC (need to send 2 in for repair)
-axle-mounted servo (TowerPro MG995)
-custom short chassis
-custom links made from 3/8x1/8" polycarbonate tube with 1/8" carbon fiber rod down the center, and Revo rod ends
-Proline Masher 2000s on custom beadlocks
-Maxx slider shafts
-no tranny, just pinion gear to spur gear, and spur gear is mounted to the output shaft
-geared 9/52, diff ratio is 2.92:1, total top speed should be about 4mph
So far I have the servo mounted to the axle, and the lower links are finished. Next I will make the upper link mounts on the axles out of some aluminum u-channel, and after that it will be time to design and cut the chassis. I'll get pics up as I progress.