From Tamiyablog...
Very wide shell. Why?
Because it seems to be concealing a transverse motor with a complicated central gearbox. Superficially it looks like a centre diff, but I think it is actually a dual-gear drive, one for the front gearbox, the other for the rear.
Interesting solution, rather like one of the possible ways of building the Awesomatix touring car, and evocative of the classic Tamiya 4wd chassis. Puts the motor in the ideal orientation for getting the power down, but also hangs it out off the side of the chassis.[/URL]