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Basically it depends on how the transmission provides lubrication for it's internal components.
In many the primary pump is directly behind the torque converter and is providing lubrication whenever the engine is running. This means if you coast with the engine off your transmission has no pressurized lubrication which will be disastrous when you transmission fails from lack of lubrication.
Some say if the owners manual says your car can be flat towed (drive wheels on the ground) it will be OK to coast with the engine off. I am not sure it's a good idea and the cost of a bad decision can be extreme.
Engine on coasting should be no problem as long as your transmission can handle going into gear at the end of your coast.
My position is engine on OK, engine off not OK.
regards
Mech
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