Send an email to
nick@rummyrc.com. I can share it with you but not publicly right now.
Those axles you have listed from RC4WD are all way to small. The only one that might work is the Twin Force axle. That will take some punishment. I would have used them on my truck but they are only around 12" hex to hex. The X-factor axles I'm using are 14" hex to hex and the rims are full offset.