Abstract: A tool for installing the planetary assembly and reverse clutch assembly of an automatic transmission as a combined assembly therein. The tool includes an elongated tubular handle extending along a longitudinal axis having a first end and an opposed second end. A grip assembly is formed at the first end of the handle. The grip assembly has a handle extension fastened to the first end of the handle and extending away from the handle along the longitudinal axis, and a pair of spaced fingers positioned at the free end of the handle extension, the fingers being spaced about the longitudinal axis of the tool and extending in a direction transverse to the length of the tool. The fingers of the tool are adapted to engage a groove defined in the hub of the front planetary assembly so that the combined reverse clutch assembly and planetary assembly can be simultaneously installed in the automatic transmission of an automobile.