Abstract: An interchangeable power train system for use with either a 3-wheel electric powered vehicle or a 4 wheel electric powered vehicle includes a power assembly and a drive assembly mounted to a support assembly and disposed in an operative communication with one another. A chassis assembly for a 3-wheel electric vehicle body and/or a 4 wheel electric vehicle body is provided, wherein the support assembly includes one or more mounts and the chassis assembly has one or more corresponding interconnects each dimensioned and disposed to temporarily yet securely interconnect to a corresponding one of the mounts on the support assembly. An interface assembly operatively connects the power assembly and the drive assembly to either a 3-wheel electric vehicle or a 4 wheel electric vehicle to permit operation by a user seated therein.