tc3xlr8er,
there are several ways to do this, some are putting erasers in place of diff balls and tightening down, others are pinning them...
but the best I've seen so far is from Dave Irrgang (IRS)
check it out...
http://www.teamirsrc.com/tc3.html
TC3 Straight Front Axle - machined from 7075 T-6 aluminum and hard coat anodized blue. Comes with ring gears and screws. We recommend using IRS147 pin cushions along with this axle to extend the wear.
I have one and it is real sweet....