Need help with choice of 1/8 scale diff for E-maxx

[Maxxamongus]

lol Tinuss! This truck was purchased in September of 2009. It has been really dirty. However, I learned from my grandfather, years ago, to always clean up the things that will require maintenance later. He was talented in building many things - including his own homes and repairing his own cares. This list could go on. So, anytime I run the trucks, when I get home they will get cleaned up. (makes them easier to work on later)