Copyright Goodheart-Willcox Co., Inc. 579 Chapter 17 ∣ Final Drives Goodheart-Willcox Publisher Figure 17-10. In this double-reduction outboard planetary final drive, the inner second stage planetary carrier is held, causing the power flow to rotate in the opposite direction of the axle shaft. Goodheart-Willcox Publisher Figure 17-9. In outboard double-reduction planetary final drives, the axle drives the first reduction sun gear, and the first reduction planetary carrier drives the second reduction sun gear. The second reduction planetary carrier drives the wheel. The two ring gears are held stationary via the spindle. Drive hub First reduction stationary ring gear Second reduction stationary ring gear Second reduction planetary carrier Second reduction sun gear First reduction planetary carrier First reduction sun gear Stationary spindle Axle shaft Differential housing First stage ring gear Second stage ring gear First stage planetary carrier First stage sun gear Second stage sun gear Second stage stationary planetary carrier Wheel hub