The E-revo tranny is rock solid. Very tough. But the slipper is not really meant to handle a 14 pound+ truck so just upgrade to the
Hot Racing double slipper. It uses six pads instead of three. That was my set up on my E LST XXL and it worked awesome. The Hot Racing doesn't come with pads so you have to get two sets of slipper pads from Traxxas. You have a choice of the stock pads or the heavy duty aluminum pads. I was running the stock pads and they were fine.