I only run on a track...just use the truck as practice...not a race rig. I run 10 - 10 - 5 nothing special. track is medium/large (40sec laps on ave.) It gets very bumpy and has a lot of acceleration holes out of the corners. Because of the power of the LRP. I geared up to a 14 on the bell ( I think...anyways one larger than stock). Diffs are fine - meaning I never subject them to bashing or full on race scenario...have a 8 minute run. Put her down and drive buggy for a 8 minute run..then shoot the shit with the boys. Like I said...I race a D817T