Why would FoMo or any manufacturer allow a vehicle to roll forward (as if in neutral) when it's put into reverse with the engine off? I would assume (wrongly) the drivetrain would lock up preventing it from rolling. Just wanted to do a simple singlehanded test of my back-up lights and noticed she was rolling forward (just a few inches before I lassoed her back).

 

first off use your parking brake

second you must not understand how transmissions work. The way the transmission "holds a gear" is using hydraulic pressure. The transmission can not make pressure unless the engine is turning the transmission oil pump. so no pressure to hold gear when the engine is off.

again use your parking brake, thats what its there for

 

Hydraulics? Technological improvements. Bah! I'm still searching for the PTO!

 

that is pretty much how all automatics work...

 

ALWAYS use your parking brake when parked. Also, there is nothing in the transmission to lock the driveshaft in place unless it's in park. If there was, you wouldn't be able to move the vehicle in reverse.

 

Agree & Disagree with some of the comments, sorry. There is a "Special Bulletin" that is not released to the general public (as in a TSB) BUT there is an issue with a bad seal for the pump in the transmissions that let's the hydraulic fluid leak back down into the pan causing issues with tranny slippage etc...

Mine is in the shop now and has been for almost 2 weeks and is awaiting a new transmission. The issue according to the bulletin supposedly concerns 2010 5.4L 6sp transmissions but my truck proved otherwise. I have a 2009 4.6L 6sp transmission and the problem is there. Transmission suffered major damage and is beyond repair, clutches gone bad, pump bad, burnt transmission fluid etc...

Keep on it with the dealer and as a quick test, when you first start your truck in the morning...immediately put it in reverse and try backing up, if the transmission slips then take it in.

Good luck!
Bob

 

thats not the problem hes having... his car rolls when he turns the engine off, which is normal. The engines not turning the tc isnt turning the pump isnt turning= no hydralic pressure to hold any members in the tranny.

 

X=2 normal use e-brake

 

Just got off the phone with the service department (yes they are working late due to a Ford Recall on the Edge cars) for an update to my truck and I said let me ask this question of them. According to the Service Manager and a tech this is NOT supposed to roll like you said as the pump holds pressure even with the engine off but they suggest you use the parking brake as a precaution, in the case of my truck it would have eventually rolled when the pump lost pressure due to the defect!

So I decided to confirm what they said and parked the 2010 5.4L 3V 6sp truck loaner I am using on my driveway looking downhill (25 deg slope) and put it in park, turned off the truck and eased off the brake, and guess what? The truck didn't budge, so I preceeded to leave the door open and stepped out and rocked the truck and guess what? It didn't move! Would you explain why this truck is different then the rest of the rolling trucks? I am very curious....awaiting your reply.

And by the way...I tested this in reverse as well....

 

you put it in park. put it in reverse and see if it rolls...

please read the thread and not assume anything. he was talking about it being in reverse not in park.

 

Dark_Wizard - what did your testing show while in reverse and engine off?

 

hmmmmm ........ yup looks like 2 different situations to me. reverse and park are 2 completely different settings on the tranny. yup pretty positive on it. P.....R...... hey wiz what does it do when you place it in reverse?

 

I read this thread early this morning. I thought maybe there was something new with Ford auto trannies...

So I tried it this afternoon. Parked the truck on a nearly, but not quite, level part of my drive; shut the engine off, and drifted forward in reverse. Tried it again in D, 3, 2, and 1, same result.

I didn't drift in P however.... just like every other auto I've ever driven.

 

im sorry i have been taking to long to reply to your message. well honestly it was because i was laughing so hard at your attempt to be all high and mighty. The pump will not hold pressure when the engine is not running... i will bet anything. the tsb your talking about, which it is a tsb not a "special bulletin" talks about slipping, when the car/truck is first started implying in running. Further more tsb's are not available to the general public, they are acquired from people have work at ford, or have a 3rd party that provides them. Number 2 your test was in park... there is a parking pawl in every automatic transmission, your test concluded absouletly nothing! im awaiting your reply. please say something i need some more humor today