Abstract: A mounting device with two attachment portions, one connected to a transmission portion of an engine/transmission assembly and another connected to a frame member of a vehicle in which the attachment portions rotate relative to one another about an axis normal to a plane of engine/transmission angulation during assembly thereof to the vehicle and during subsequent operation of the vehicle. A stationary cylindrically tubular sleeve encircles a rubber isolator which can rotate in the sleeve. One of the attachment portions of the mounting device is connected to the rubber isolator and rotates with it whereby the angular position of the engine/transmission is varied with respect to the vehicle.