I have hybrid bulkheads with 43/13 diffs, 2nd speed maxx tranny and 51/16 gearing (strobe) for general bashing and 51/18 for higher speed runs.
Motor pulls ~1900Watts on aceleration from standstill
truck needs just few feet and small jump to do a backflip :)
video -
http://www.radeks.net/?p=74