You know what else? I just went to HPI’s web site and looked at the number for the stock gear for the MT2 and they have the same number as the stock gear for my MT Racer. They both take an A855. So if the axels are larger the ball cups where they go in to the gear must be the same. Goes to show HPI could be wrong all so? I think they told you that as they new the one gears would work but did not know if the others would!