Ive been testing this
I earlier had a bit of a on power push problem, this as well as a shock change helped out a fair bit.
I will tho try the shocks and rest of the setup on the stock chassis.
I went with the ball diff for a while and thought that it worked really well, but it got a bit gritty so I changed to the gear diff (unknown oil/grease just now) and the high diff position.
Im really liking it after some frustrating earlier testing.
I was a little loose rear untill the slicks warmed up