Sloppy Tranny

Don't believe the movement is in the trany. I'm pretty sure it is in the U joint, and diff. After all. Once you put it in park. The trany is disengaged, and the rear end is holding the vehicle.
IF you would ever raise both rear tire off the ground with the selector in Park. You could see that IF you turn one wheel forward the other will spin backwards. It is designed so that when in park. they fight each other and keep the vehicle from rolling.

Yup!
I yet to meet a tow vehicle that didn't do it! And each one has it's own amount of distance it moves!

smkettner wrote:
Parking pall is not really designed to hold the truck from rolling.
Use the parking brake.

:S :S :S
You have a trailer in tow and you trust the parking pall to hold both your TV and trailer have way more trust than I do!!!
This is how people get killed by their TV running them over because it slipped out, or you didn't get it completely engaged.

Auto or manual SET THE PARKING BRAKE!!!

Parking brake required when it is perfect

Yes, parking brake is necessary for locking in the drive train for non movement of the vehicle when hitching or unhitching. There is about 1/2 inch tolerance for the ball and latch.

Forgot to mention, always chock trailer wheels before Un coupling the hitch. It usually jumps.

Parking pawl is not really designed to hold the truck from rolling.
Use the parking brake.

That's how it works, put on the parking brake.

Both my Suburban and Truck do the same thing. I too just set the parking brake.