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I put the RR idler gear, Dhawk Diff gear, and b4 topshaft with VTS slipper in my stealth. It handles the power from the 3800kv motor just fine. Even when I ran it on 3S and 47/69 gearing. That ended up with the stealth running at 30,000 rpm; it's a little crazy how well it works.

I should say that I had a thread similar to this a little while back. I went with a cheap route. Skyrc 3930kv motor esc programmer combo. I'm still in doubt of the motor but it runs just fine so far.