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https://www.uhaul.com/Articles/Tips/...r-Instructions

Transmission damage to your vehicle-in-tow

When towing a rear axle driven front engine vehicle, the drive shaft must be disconnected to prevent transmission damage. Simply placing the transmission in neutral is not sufficient and will not prevent damage due to a lack of internal lubrication. You must disconnect the drive shaft at the rear axle and tie or wire it up. The universal joint bearing caps must be taped on to prevent loss of the bearings. If you choose to remove the drive shaft entirely, it may be necessary to cap the transmission tail shaft to prevent fluid loss and possible future damage. Consult your vehicle owner’s manual.

U-Haul Centers and dealers are not required to remove or reinstall the drive shaft as part of the rental. However, some U-Haul Centers and dealers can do this for an additional fee.

Front wheel drive vehicles do not need drive shafts disconnected because the drive wheels are loaded on the tow dolly.