Had my first race evening with the S. I thought I had the rear diff sealed but it leaked real bad and splattered pretty much everything. I have sanded the cases and put anti wear grease on the seal but didn't work. On the plus side the diff itself feels good, I put 40wt shock oil in the rear and 1:1 comma multi purpose grease in the front diff which feels smooth but stiff. Going to try sealant before giving in for a ball (would ball be better than the roller diff?). I didn't want anything too fast so put a 13.5 motor in the car but under geared the car massively. 24/80 with the 19t pulley. Least it helped stay on track! Going to get 28 30 and 32 for next week.