Abstract: A hydraulic transmission drive assembly having a pair of hydrostatic units mounted in a housing assembly for suspension from a primary housing and with the housing assembly supported on the primary housing by noise attenuation means including a pair of isolation mountings each of which are of a multi-layer construction with a plurality of plates for connection to either the primary housing or the housing assembly, with resilient material bonded therebetween and with mounting means extended through openings in said plates and surrounded by resilient material which is spaced from an opening in a center plate of the isolation mounting whereby axial loads result in compression of the resilient material and flexure of the plates and torsional and transverse loading results in shear of the resilient material under light loading and, under heavier loading, the resilient material surrounding the mounting means additionally acts in compression.