A transmission for a vehicle and a method of assembling a modular motor assembly in the transmission are disclosed. The transmission includes a housing defining a cavity along a longitudinal axis. The transmission further includes a first motor/generator and a second motor/generator each disposed in the cavity. The transmission also includes a first support supporting the first motor/generator such that the first motor/generator is mounted to the first support to define a first modular unit. The first modular unit is attached to the housing within the cavity. The transmission further includes a second support supporting the second motor/generator such that the second motor/generator is mounted to the second support to define a second modular unit. The second modular unit is attached to the first modular unit such that the first and second modular units align with each other along the longitudinal axis within the cavity of the housing.