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Here’s the AOD’s concentric input shaft setup (ignore the outermost splined shaft in the photo—it drives the tranny hydraulic pump). The inner shaft splines directly to the converter front face, and constantly drives the direct clutch at engine rpm. The outer input shaft takes power from the hydraulically driven converter turbine and sends it to the forward clutch. In the Street Terminator Lock Up’s power flow, the small shaft drives only Overdrive—generally used only for cruising—while the outer shaft has responsibility for First, Second, and Third (and Reverse).