I thought you got all your questions answered in your original thread:
http://www.rcuniverse.com/forum/m_10031285/tm.htm
Why another thread ... just add to the existing one? Willy is the one you need to get a hold of on a truck R/C project. That or just find a 1/14 - 1/12 kit on eBay.
Here are a few forums to further inquire on:
http://www.tamiyaclub.com/forum/
http://www.scale4x4rc.org/forums/index.php
http://www.tamiyarconroad.com/vb/forumdisplay.php?f=2
- Jeff