[Overdriven]

Nice build, I really like the concept too. I'd go with 30k up front, 10-20k out back, traxxas diffs need thicker oil than 1/8th diffs. For the center it depends on how resistant you want it to be from unloading and the style of handling you want. If its going to be about buggy weight 30-50k would be a good starting point though for an all around basher. I like mine with 30-50k, gives enough resistance to unloading for me, yet I still get diff action on low grip surfaces so the handling is there. IMO 100k has very little diff action unless its on high grip surfaces, a heavy vehicle, big tires, lots of power or a combo of those. So the handling is more like a MT with a trans than a buggy or truggy. Experimentation will likely be required to get YOUR desired result either way.