I recently re-converted my GST to a simpler, faster, cleaner set-up. I removed the entire stock gearbox and servo's, except the steering servo. This saved a lot of weight and reduction in gearbox friction and noise. I the installed the
http://www.smrcinnovations.com/ diff/motor holder with a Ofna Mutilator centre diff and some other new bits and parts. Still waiting on my Mamba Monster ESC from a warranty repair, but with the 1600kv Castle-Neu and 5S2P she ought to haul some major ass! I am going to try running the smaller GSR 5.0 wheels to see what the effect on handling and speed would be... Braking would not be mechanical anymore, the Monster must do that now.
Some pics below