Do they even make 20k. i know traxxas makes 10K. 30K. 50K. You could just use sillyputty, and pack the diff with that.
everytime I have seen 20K it has been discountinued
I currently run 10/30/3 in my truggy with a MAch, so i am stuffing 2 more horses in that thing so I'm going with 10/20/10, i think. Once again thanks Vb!