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I can't imagine that coasting in Neutral will hurt it, but that depends on how it reacts going back from neutral to drive, if it clunks or makes any other indication that it's not happy I wouldn't do it too much. As far as coasting with the engine off, see if the truck can be "flat towed", which means being towed with all 4 wheels on the ground. If it can't, or it doesn't specifically say that you can, I would leave the engine on.
The reason is with the rear wheels turning, so is your driveshaft and transmission, if the oil pump for your trans runs with the torque converter, you NEED to have the engine running to pump fluid to keep everything lubricated, even while coasting.
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