I knew it would be a long shot, and I don't have enough posts to message him.
This build thread was awesome. No one is talking about the differentials though. I blew out so many. A big part of the V2 kit was the new cooling head, and the through bolt differential cases. Both V1 and V2 cases are clamshell plastic. The V1 would flex and strip the ring and pinions. The V2 essentially had a through bolt with lock nuts and additional plastic to try and prevent this. That is why companies like MSJ and websites like midman.com were so popular. The truck was underbuilt and under developed. It needed aftermarket support for almost everything...except that sweet .70 motor...it was heavenly!
I will have to see if I can find the video of the 2-speed EK4 racing 1/8 buggies and T-Maxxes. The EK4 was very fast in a straight line but lost ground in every corner!