Hmmm....So it's traction that you want, eh?
It appears that you can add grease to your diff to help with the traction department.....but it's not achieving what your talking about Ram....not entirely. Here's a couple of links to check out on adding diff grease:
http://www.rccentral.com/article.asp...=4&PAGE_NUM=11
http://www.misbehavin-rc.com/pit-lan...es-grease.html
BoneZ'.....How you been?