I've got TC6.1 with an exotec conversion which makes it more of a 6.2, it's got gear diffs front and rear as its always been used on polished floor.
I'm selling up so you can have it as a roller or with electrics, it's got a cheap low profile servo in it and a hobbywing speedo, if you're interested let me know and I can give you more details.
My email is
[email protected].