Is anyone out there running UE diffs on there 9L with 14 cell packs? I'm probably going to order them this week and I'm currently running 51 tooth mod 1 spur with a 15 turn pinion and it seems a little to tall for my track. Since the UE diffs lower your overall gear ratio I was wondering if by adding the UE diffs would I still need to drop a tooth on the pinion?