A transmission includes a housing having a first end and a second end opposite the first end, a carrier mounted to the housing, an input shaft, an output shaft, a passage that extends from the housings first end to the housings second end to allow a via through the housing, an input sensor, and an output sensor. The carrier has a first side that faces in a first direction, and a second side that faces in a direction other than the first direction. The input sensor is mounted to the carrier and disposed on the first side of the carrier. The output sensor is mounted to the same carrier and disposed on the carrier's second side. The input and output shafts rotate about the same axis.