RE: WALKERA 37
I'll bet you get it quick, if it's anything like mine. He was selling just the motor when I purchased mine, but maybe he's only doing combo's now. Anyway, I was checking the pinion on my motor tonight and apparently I've been running a 10T not an 11T. I took it off and put my 11T on but haven't had a chance to fly it yet. I thought I had been running an 11T all this time and was planning to put a 13 on tonight but I don't have one.
You'll need a pinion for your new motor and the Align 3 packs work great. I have the 9, 10, 11 pack. I'll let you know tomorrow how the 11 runs...