F-20 Puller: Help me understand this

I got my first F-20 at the age of 11 and have several including a wide front in my collection. My puller from when I was young has 15.5 38s on cast with 3 7/8 pistons. NEVER had I EVER spun out or was able to raise the front end off the ground. I always powered out. What does this guy have hidden under the hood?

http://www.youtube.com/watch?v=NoJIr0cdATk&feature=related

http://www.youtube.com/watch?feature=endscreen&NR=1&v=AxZsqf5v38w

http://www.youtube.com/watch?v=ZCHn6E3Nbfg&feature=related

I am also posting this question on the Farmall and Pulling Page. Thanx.
 

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