2010 550 x2 won’t shift while running

Hello all,

New to the forum.

I have a 10 550 x2. Recently has become impossible to shift while the motor is running. I have read multiple threads on the issue, and I’m still trying to isolate the problem. Here is what I have so far.

Problem, once started in any gear, (H,L,N,R OR P) cannot shift to any other.
Have to shut the motor off and then it will shift to any range.

Things I have checked.

Idle RPM is correct.
Checked trains fluid level. Full but probably overdue for change.
Pulled PVT outer cover. Belt doesn’t appear to be worn. Drive and driven clutches appear to be aligned properly.
Belt appears to be centered in drive clutch.

Things I have noticed.
The driven clutch is turning way to fast at idle.
When I jack the rear end up it will shift through the gears while the motor is running, only when there is no resistance..

Any help would be appreciated. Only thing I’m unsure of is what to look for is belt wear. I’m a solid auto mechanic and know the obvious signs. Cracks splits etc.

Thanks, Cliff