Abstract: This invention relates to an apparatus and method for mounting a transmission (32) in a frame (10) of a vehicle (12) which eliminates the problems of accessibility, complexity and the need to elevate the vehicle for access from beneath. The mounting arrangement has a first trunnion (42) releasably connected to a first side (34) of the transmission (32) which is slidably disposed in an aperture of a first side member (14) of a frame (10) and a second trunnion (52) releasably connected to a second side (36) of the transmission (32) and slidably disposed in an aperture in a second side (16) of the frame (10) and a guide apparatus (72) for slidably connecting a second end (40) of the transmission (32) to the frame (10) and guiding the transmission (32) for movement in directions substantially normal to a transverse trunnion axis defined by said trunnions.