The HL stuff would never hold up to the work load being put on this type of project.  Virtually everyone I have seen use gear motors with reduction units. This is in a series config. They are put into a cylindrical "axle". As had been stated there is very little room to begin with and a convetional gear box just would not be the way to go. As far as the HL electronics, well they speak for them selves.<div>http://hobbyocasion.xopie.com/es/lis...modificaciones</div><div>http://www.rctruckandconstruction.com/index.php</div><div> The first site is just an example of what people do and how they build them. The second is a really good forum to get all the info you need. </div><div> A good bunch of guy's over there too.</div>