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Anyone saying its fine for a manual transmission to be flat towed in neutral clearly has no clear concept of the internal workings of the transmission. When the engine is off, and the driveshaft is spinning the mainshaft, the mainshaft itself is all that is spinning. All gears remain stationary, and since the mainshaft sits above the oil level, there is no splash lubrication. DON'T do it, there is a very good reason the owners manual advises against it. Same lack of lubrication applies to an automatic because the pump doesn't get driven.

Pull the driveshafts, trailer it, if getting towed on a standard axle lift tow truck, be sure they dollie the other axle, or get a tilt-deck.

 

pull drive shafts and call it a day

 

True on the 5 speed stick. Not true on the six. It has an output reduction gear instead so splash lube depends on whether the truck is moving, not whether the engine is running. Seems like an odd design choice for a truck transmission to me.

 

That's what I wondered. I knew in other transmissions what Landphil said held true but I wasn't sure about our 6spd. I've always avoided coasting in neutral for too long of periods because of that. Good to know.

 

I stand corrected, I had assumed the 6spd was a more conventional design, my mistake. I found an exploded diagram /service manual PDF of the aisin RA60, and you are correct that it will get splash lube when the engine is off, and the truck being towed. It will also get splash lube in the forward section when stopped, and running in neutral since the forward two gears on the countershaft will be spinning. I think we will agree is a good thing. Thanks for the correction!

 

Sweet, guess that means I can roll it in neutral down hills without fear. Well... mostly.