Will this work in my F8T Pro?

[brian015]

Yes, smaller pinion to start. You can put your numbers in here and see if you can gear for around 40mph top speed:

http://www.scriptasylum.com/rc_speed/top_speed.html

That's where I'd start.

Edit: And since its designed as a buggy motor, you'll need to keep an eye on the temps, in the heavier truggy.