[Rogue42]

Okay noticed an odd thing yesterday. When I arrived at work yesterday we had a thin glaze of ice/snow mix. I parked in my normal spot (residential house, paved driveway with gentle slope). When I left I noticed that my truck was not where I parked it originally.

It had moved 3 feet down the driveway.

I do not think it slid on the ice. I kicked the tires, and pushed on the front end and it didn't slide anymore. I looked at the tire tracks and they had tracks not smooth like it had skidded down the driveway. I walked down the driveway and didn't slide at all, I didn't think it was that slick.

I had the transmisison in Park, but not set the parking brake. I normally don't do this unless I am on a hill or have the camper attached. Again this is a very gentle slope to the driveway so I never considered it needing parking brake.

I took some pics with my cell phone but right now I don't have a way to upload them (unless I pay the extortion prices to upload via Cingular). You could plainly see that where I exited the vehicle in the morning was about three feet to the right of where I would enter it. There was no way I got out in a different location, it was nearly at the tire.

So either it slid or I have a problem with it moving while in park. Thoughts?

 

[HDpullingpower]

I am sure it is the ice, I had a similar experience with my police car, went on a call stopped half way up a driveway due to ice, came out and car was at the bottom of the driveway. My K-9 dog was in the back looking at me like you dumba$$.

 

[BudTX]

My stationary truck slid on ice twice in the past week, both times sitting on an ice covered concrete driveway. It did not go straight back as you described, though. Fortunately, it did not slide into anything, just ended up parked a little bit crooked.

In your case, I wonder if there is an issue with the parking pawl?

 

[Machinator]

If the park pawl failed it would have kept rolling.

 

[wq93]

Unless it was in 4 wheel drive the front tires would have rolled anyway and those may be the tracks that you see as opposed to sliding marks.

 

[sam50gt]

luck nobody was in the back

 

[Rogue42]

But if it started to slide I figured it would have continued to slide all the way to the street.... And it wasn't that slick, I walked on it and didn't slide at all and it weighs a bit more than me. Maybe it slid and got some more traction on one or more tires and it stopped. That's why I kicked the tires and pushed it on the front bumper and rear bumper to see if I could get it to slide again.

I just checked at lunch, and it decided to stay put today, but most of the ice/snow has melted.

 

[winter200]

I have had this happen before on light slopes but not to the extent you are talking about. There have been a few times where i put it in park and took my foot off the brake and the truck rocked back, when it did it broke the tires loose on the snow/ice and slid. How far of a drive did you have before you parked it? Years ago i pulled a charter bus out of a parking spot that when he parked his tires were warm and when they went to leave it had melted into the hard packed snow. He just needed a little budge (for a bus, the old blazer had its hands full) to get him out of the holes that he created in the snow. Your tires could have been warm, melted the snow under the tires and the water on the ice could have reduced the friction until it slid back to a point where the water was no longer present, the friction increased and stoped it from moving.

 

[mattydmax]

I had an old Ford work truck a few years ago that slid about two houses down the street we lived on in KC. The truck didn't start to slide until I slammed the locked door shut. Me and the truck were on 2" of fresh ice after an ice storm so we just slid down somewhat together while I fumbled for the keys. It eventually stopped on its own. Had a heck of a time getting it back up that hill. (2WD) It didn't really stop for any reason that I could see except it found the tiniest bit of traction. The Allison parking pawl is rated at 20,000 lbs. so I would think you are ok there.

 

[DEWFPO]

I have had this happen before on light slopes but not to the extent you are talking about. There have been a few times where i put it in park and took my foot off the brake and the truck rocked back, when it did it broke the tires loose on the snow/ice and slid. How far of a drive did you have before you parked it? Years ago i pulled a charter bus out of a parking spot that when he parked his tires were warm and when they went to leave it had melted into the hard packed snow. He just needed a little budge (for a bus, the old blazer had its hands full) to get him out of the holes that he created in the snow. Your tires could have been warm, melted the snow under the tires and the water on the ice could have reduced the friction until it slid back to a point where the water was no longer present, the friction increased and stoped it from moving.

I've seen this happen, the warm tires melt the ice.

DEWFPO

 

[Enigma Man]

Yep I have had this happen in my own drive way, I parked the truck got out popped the hood and went to go plug in the block heater, as i went to grab the cord it tightened up and I noticed I was getting farther and farther from the truck.. I was like "Crap im not moving wtf is going on here?!" Then i realized it was my truck sliding backwards down the drive way. It was prob just enough heat to get it to slide like they said.

 

[_nar_]

Happens to me all the time on the slope in front of my parents house when it gets packed down and slick. It just slides back because the ice is so slick.