The front diff needs a rebuild and I have parts on order. Until then I'll test on 2WD.
The gearing on the EK4 is pretty low and after calculations I worked out that to simulate the 17,500rpm/18T pinion combo of the Nitro version, a 10T pinion/8XL/4S would be similar. I used a 12T pinion as a start point figuring the low end torque of the 8XL will pull through.