So my question regards pretty much a variety of A1P2 trucks I have found a couple that this question doesn't adhere to. You take a truck down the road and come to a slight incline or decline. You place your transmission in N and parking brake still pressed in. As you let off the brake pedal common sense would tell you that your going to roll. However, for some reason most of these vehicles are not. Still without touching anything turn the truck off once the last expel of air occurs from the truck it begins to roll freely... like it should have before.
Some thought after holding brakes and releasing may be causing an issue so I test drove it and coasted in N until the truck came to a stop on its own. The results were the same where I couldn't roll freely unless I turned the off the truck.
I'm believing that it is something inside the transmission merely because when you coast to a stop when it comes down in speed to that last little bit there's a jerk in the front almost like a gear and then pushes backwards which feels like a gear.
Are these trucks supposed to be doing this, meaning they added something along the way as a safety precaution of some sorts? Or could this be the beginning of a failing part? The truck is BAE made and I tried talking to them about it and it went nowhere.