Can’t find neutral on my 904

By chance the rear brakes new? and adjusted right?
NOt 100% sure. Anything is possible. However when I apply the parking brake it locks up the wheel no movement at all (as it should). When I disengage the brake I get some slop movement but thats it. The slop might be drivetrain. Not sure but I will cut the problem in half and take out the drive shaft to isolate the two ends…