Originally Posted by Mini35

Yes, a diff fits straight in (XP-10022) but you need another pair of the c-blades to go on the front driveshafts. It does make the car hugely easier to drive on a small tight track. Mine was undrivable with the spool, just kept spinning out all the time. Now with some 100k oil up front it's nearly right. I'm going to try some 200k to fine tune it.