Mine is the 820 12v version. I had to do some research but i found the correct part number. The 12v version is a hotter motor. It runs about 500kv/volt faster than the 14.4. 4s was the most i was planning on running even though you can run 5s through it. And by "hotter" i mean its got more pep. And more heat obviously. So i probably cant run as tall as gearing as you did. And i am going to run a fan on the esc and motor to be safe. But with 8000mah i am not worried about the extra battery drain.