In other words if I try to shift the 4x4 lever to 4 lo while in neutral or D and engine running, it'll make a loud grinding noise. But if I stop the engine and shift to 4 lo first before I start the engine and shift to D after, 4x4 will work. And while 4x4 is working and I try to shift back to park it'll grind. I'm pretty sure 4x4 isnt supposed to work like that lol. Been reading a lot about these trucks but haven't seen anyone with the same issues I'm having. BTW this is a 01 frontier.