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The five types of final-drive now in use on motor vehicles are stated by the author to be (a) the chain-and-sprocket, (b) the bevel-gear, (c) the worm-gear, (d) the double-reduction and (e) the internal-gear. The advantages of each type as emphasized by its maker are presented and commented upon, and the same procedure is followed with reference to their disadvantages. Following these comparisons of the different drives, which cover about the first third of the paper, the bearing loads and shaft stresses of typical semi-floating and full-floating axles are calculated for the conditions (a) maximum torque plus the normal radial-load on the wheel, (b) the wheel locked and skidding forward when the brakes are applied and (c) the wheel skidding sidewise while the truck is moving. A tabulation of the results obtained from the mathematical calculations is included.