Can someone tell me if the 3racing ball diff for a Tamiya TT-01 will fit a TT-01D without any other upgrades needed like..... swing shaft,diff cup......ect.....Will it just drop in and work.....Or do I need some other parts also........I Want to lock the rear diff and put ball diff in the front.

It should work fine as long, you need to buy the diff output cups separately if you want to use cvds.

tt-01 and tt-01D are the same car, one is just ready for drifting, all parts fit.