A transmission assembly comprising: a transmission housing ; a first ring-carrier/ring-carrier gearset including a first sun gear , a first carrier , and a first ring gear disposed within said transmission housing ; a second ring-carrier/ring-carrier gearset including a second sun gear , a second carrier and a second ring gear disposed within said transmission housing adjacent said first ring-carrier/ring-carrier gearset ; an output shaft connected to said first ring gear of said first ring-carrier/ring-carrier gearset and said second carrier of said second ring-carrier/ring-carrier gearset ; a first input shaft connected to said second sun gear of said second ring-carrier/ring-carrier gearset ; a first controllable clutch connected to said first sun gear of said first ring-carrier/ring-carrier gearset ; a second input shaft connected to said first controllable clutch such that said first controllable clutch selectively couples said second input shaft to said first sun gear of said first ring-carrier/ring-carrier gearset ; a second controllable clutch selectively coupling said second input shaft with said output shaft through said first ring gear of said first ring-carrier/ring-carrier gearset and said second carrier of said second ring-carrier/ring-carrier gearset ; a first controllable brake selectively coupling said first sun gear to said transmission housing ; and a second controllable brake selectively coupling said first carrier of said first ring-carrier/ring-carrier gearset and said second ring gear of said second ring-carrier/ring-carrier gearset to said transmission housing , such that said first and second controllable clutches and said first and second controllable brakes control the torque of said output shaft as a function of forces driving said first and second input shafts . a transmission housing ; a first ring-carrier/ring-carrier gearset including a first sun gear , a first carrier , and a first ring gear disposed within said transmission housing ; a second ring-carrier/ring-carrier gearset including a second sun gear , a second carrier and a second ring gear disposed within said transmission housing adjacent said first ring-carrier/ring-carrier gearset ; an output shaft connected to said first ring gear of said first ring-carrier/ring-carrier gearset and said second carrier of said second ring-carrier/ring-carrier gearset ; a first input shaft connected to said second sun gear of said second ring-carrier/ring-carrier gearset ; a first controllable clutch connected to said first sun gear of said first ring-carrier/ring-carrier gearset ; a second input shaft connected to said first controllable clutch such that said first controllable clutch selectively couples said second input shaft to said first sun gear of said first ring-carrier/ring-carrier gearset ; a second controllable clutch selectively coupling said second input shaft with said output shaft through said first ring gear of said first ring-carrier/ring-carrier gearset and said second carrier of said second ring-carrier/ring-carrier gearset ; a first controllable brake selectively coupling said first sun gear to said transmission housing ; and a second controllable brake selectively coupling said first carrier of said first ring-carrier/ring-carrier gearset and said second ring gear of said second ring-carrier/ring-carrier gearset to said transmission housing , such that said first and second controllable clutches and said first and second controllable brakes control the torque of said output shaft as a function of forces driving said first and second input shafts . <EOS>