I rebuilt my diffs for last weekends race and ran 7/30/5 and the car was very easy to drive with the 5.5 in the beginning of the day and even after I put a 13.5 in it to try out. I’m putting a 7.5 in this week for good as the track isn’t 5.5 worthy so we’ll see how it goes. My home track has 5 180* turns so a ton of steering is your friend so the 7 works well.