Last week I installed an aluminum trans case mostly to deal with motor temps getting over 160 before my bat was at its cutoff. Temps were getting to 170-180 then I would take a break and top off the bat. Ran it today at the track on carpet. 3cell 4000ma /4250kv 10.5 turn revtech motor/ MMP/ 16 pinion/ 90 spur. Ran the bat to its cutoff and was getting between 116 and 120. So now I'm thinking 19 pinion and check what I get. If its good the aluminum case made me faster as well.