A turbofan engine includes a first spool including a first turbine, a second spool including a second turbine, and a fan. A fan drive gear system drives the fan. A first tower shaft engages the first spool, and a second tower shaft engages the second spool. A superposition gear system includes intermediate gears engaged to the sun gear and supported in a carrier and a ring gear circumscribing the intermediate gears. The first tower shaft drives the sun gear. A main oil pump is driven by the carrier and supplies oil to the fan drive gear system. An auxiliary oil pump supplies oil to the fan drive gear system and is driven by a ring gear shaft coupled to the ring gear. A shuttle valve selectively allows oil to be supplied to the fan drive gear system by one of the main oil pump and the auxiliary oil pump.