hey guys,
i run mine in a tc3 and run the gearing 65/31 on a reasonably large track and that comes out at 5.2 (i think)
, and ive had no problems and its got loads of punch and good top end, hope this helps you a little, also i run the peak brush's PEK2159 with standard springs and i've been competative with it,
good luck
J-P