[camtunkpa]

We have shifted at low pressure however the problem comes if things get out of alignment a solid plunger shaft pneumatics are going to keep pressing at a constant PSI trying to make this plunger push the balls out to engage the gear. Well the balls will eventually wear the portion of the plunger shaft that pushes the balls out. This is where our use of a spring loader plunger comes into play.
While we are still applying pressure trying to shift, the "floating" spring loaded portion of our plunger shaft is rotating on the plunger shaft and not wearing as bad. Also if the solid plunger is held rigid and not allowed to rotate you will see increased wear either on the plunger shaft or the balls themselves. Spring loaded or not is something we've tossed back and forth many times ourselves, but keep going back to spring loaded because it works and I've heard of others having issues with solid plunger shafts that are not heat treated. I will say though we tend to over design things, but we'd rather be overbuilt than underbuilt.