Just wanted to let people know that there's now a new alternative transmission option out there for the King Cab and Monster Racer. It replaces the gull gearbox, diff and outdrives with a bulletproof RC10 Stealth gearbox / diff / outdrives (you source / supply this) and there is a kit including custom mounting plates etc that allow this to be a drop-in replacement. Pretty exciting stuff! I don't run my King Cab so I don't need it myself, but given the expensive alternatives to the weak KC transmission this seems like a great option for those who do.
http://www.ebay.com/itm/Tamiya-nissan-king-cab-hi-lux-monster-racer-stealth-transmission-conversion-kit-/331934782225