The 6x6 is full build for this
The 370 motor is extremely powerful in the 6x6
The Defender has a 260 motor inside wich got very hot trying to climb
They both got a single speed gearbox,but the 6x6 has a full metal one and the defender has the stock plastic one wich is still holding..
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You can buy any upgrade Rc Parts /Ready to run from here
www.wpl-rc.com/?ref=rcgarage33