Sloppy Tranny
Just curios to know if others that tow a lot, notice when you are backing up to hook up, and you get that ball perfectly lined up under the hitch, and you put it in park, the truck rolls forward sever...
Forum Discussion
Terryallan wrote:
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.
Hi Terry, you're merely observing how a differential works in an extreme case of differentiation. Here's a video that explains why you see that behavior Exngineering explained.
When placed in park, the transmission is put into "Neutral" basically and pawl is placed on one of the internal drums or gears to prevent rotation. The pawl (think of it as a single stationary gear tooth) must land in between some teeth to lock the transmission, so there will be a little movement. Then you also have the slop/play between the transmission and the wheels it is hooked to that contributes to a little movement.
Most should set the parking brake/emergency brake to take strain off of the pawl, otherwise it could fail in an extreme circumstance, such as a hill.
