The Tamiya M-05 ball diff is externally adjustable , like a tc and has replaceable blades too.
Seems to work fine built per the instructions, with Anti Wear grease.

Just need to make sure you "feel " the bolt tension as you nip it up.

I had an M-03 for a couple of months once and sold it.
Had the M-05 now for six months or so now, It is pretty good now.

Tyres and ride height are everything , IMHO.