I had used one I installed on a 50 1/2 ton. I didn't expect it to work but surprisingly it did. I recall the rubber wheel needs to be uniform (no worn spots) and flexible. I had more trouble with the old switch lubricant that had dried up.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
