Originally Posted by andreasduess
My Honda Odyssey does the same, if you don't apply the brakes the rig starts moving. V6 gas engine.
It doesn't take much power at all just to get rolling on a level surface. I've posted this before, if you install an OBD I I reader, you might be surprised by how little power is actually needed when towing. The highest output I've ever measured was 148hp accelerating from a standing start on an incline.
Just as a point though, part of this has to do with the stall speed the manufacturer has chosen and designed into the torque convertor. Our Ford powerstroke with 5R110 trans pretty much does not move just letting off the brake. You have to bring the revs up, and I believe Ford has chosen this in order to get the turbo to spool up for greater torque in order to get the mass moving.
If the convertor reaches stall at too low RPM then you could have insufficient torque to move a maximum load from a standing start, especially uphill.
I was able one time, to be in a situation with this truck where in 4high, I put the pedal all the way to the floor and the truck and trailer did not move, and no tire spun
Got out of it, selected 4low, and stood on it, and we moved. We were, maybe just a tad overloaded that day..
.... plus the big problem was the back of the hay trailer had grounded out pretty hard crossing a shallow ditch.
I suspect that little exercise was dumping a fair bit of heat into the tranny....