from what ive seen,,, if you can give it hell to begin with, you can have an advantage of taking more weight off the front of the sled, then it slides more easily... but dont just mash it,,, roll into it. works really well with a tall truck like this one,,,Wiliamston Dome 1979 Ford 2nd Pull - YouTube

there are different ways of pulling, just like in racing....

but yea, do you start in low range or high?