In the Simpson gear set, what does the high and reverse clutch do when applied?

• A. Supplies rotational power to the sun gear
• B. Holds sun stationary
• C. Powers ring gear
• D. Locks the carrier

Answer: (A)

The high and reverse clutch powers the sun gear. When this clutch is applied, the input shaft is connected to the sun gear so it receives rotational power directly. Once the sun gear is driven, the planet gears mesh with it and transmit motion to the other members of the Simpson gear set to produce the selected output (high range or reverse) depending on which other element is held or allowed to turn. This clutch isn’t about holding the sun stationary, nor about directly driving the ring gear or locking the carrier; those roles belong to other clutches/brakes in the set.