I haven't been on rct in awhile so I haven't been keeping up on the posts in here. my indoor carpet track has switched to onroad for the fall/winter but I just started breaking down the xb2 for freshening up. It's probably been mentioned but will the lay down 3 gear fit in the '16 carpet xb2 without modification? What is the part numbers I would want to buy to do that conversion(gearbox, gears,etc)? I run stock class on a small-medium size track. Would 3 gear even be a good upgrade in my case? Or would I be better off wth the standard 4 gear?