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Like in the FMX, the AOD’s ratios come from a compound planetary gearset, having two sets of pinions mounted on a common carrier (instead of the twin carriers and common sun gear as found in the lighter-duty C4). If you have, for example, a very heavy vehicle, you may want to opt for the available wide-ratio planetary set, which bumps First gear from 2.40:1 to 2.84:1, and Second from 1.47:1 to 1.55:1. On the principle that direct drive is accomplished in a planetary gearset by locking any two members together, Lentech’s patented, Third-gear power rerouting uses the Reverse clutch to lock the reverse sun gear to the forward sun gear, all powered off the hydraulically damped outer input shaft and forward clutch (whereas the factory Third results mostly from the inner shaft and direct clutch locking the planet carrier to the forward sun gear). View Related Article
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