We run 5,7,1 in our Matrix. Front center rear. We also have been using the Kyosho diffs. CEN has a new hardning process now so as soon as they hit the door we will be switching back to the CEN diffs. Started out using CEN diffs but the center outdrives worn quick. I really liked how the CEN diffs felt though, very smooth. The drive shafts are very good which is a plus. When we run the Kyosho buggy we had to replace the driveshafts 2 times in one year.