Look at the customrcmoodels website. It was done there used, the original gearbox but was modified so the DMD can be used
The original gearbox used too much space so I bought one on AFV model as I don't have the idea before on how to approach this mod
http://www.customrcmodels.com/id455.htm
Here's what I was doing:
http://www.rcuniverse.com/forum/m_91...tm.htm#9901220