Right on the gearboxes. I have that set in my sehrman. I believe Asaitam boxes used a similar gear setup as well.
One thing I am not sure of is the brushless setup though. I always thought they were for more top end or rpm, as opposed to torque on the low end. If this don't work for you, check out the long can 480 bushed motors at <font color="#0000ff">www.etoarmour.com</font>They give plenty of torque, even at that weight.</p>