Fourth Gear POWERFLOW
WARNING: This page is about a different variant/trim than selected.
| 1 - OVERDRIVE CLUTCH APPLIED (Turns Rear Sun) |
| 2 - 2-4 CLUTCH APPLIED (Holds Front Sun) |
In fourth gear input torque is through the overdrive clutch (1) which drives the front carrier. The 2/4 clutch (2) is applied to hold the front sun gear. As the overdrive clutch rotates the front carrier, it causes the pinions of the front carrier to walk around the stationary front sun gear. This causes the front carrier pinions to turn the front annulus/rear carrier assembly which provides output torque. In fourth gear, transmission output speed is more than engine input speed. This situation is called overdrive and the gear ratio is 0.69:1. See Fig 1.