Pm,d back at yuh
I would say the diffs and slipper standard are terrible
On my old one I used shimmed d4 diff gears , this was great for around 3 race nights , 4 five min heats on carpet and polished floor. After this it was slipping I thought through the slipper clutch
However this was tight , so it turned out the diffs them selves just wernt up to much
As it was a shame , but d4 bits all the way in it!!
Like I said , I run a d4 now and sin has s10b with pro bits on it and getting there over time as he's not even 4 yet lol but very competitive
But I have a complete rtr broken down into spares that we both will be using
Try looking on here under the hotbodies bit , there's some good set ups for you
hope this helps