My buddy picked up teh only one in town last week, and since he was running mod, he let me run it in the main to test it out. I had no chance to play with gearing, and my buddy said the paperwork said to gear it like a monster. It was definately a nice motor, but I wasn't incredibly impressed. Now if you do need to gear it up a little, I may have missed some of the power. Seems like it would be a good truck motor.