Abstract: A shock absorbing cab mounting device for a vehicle is disclosed, comprised of a flange member fixed to the vehicle frame and an elastomeric vibration absorbing device, the flange member having a projection extending upwardly and inwardly with an axial bore centrally located in the top portion. The projection is bondingly surrounded by an elastomeric member which has embedded therein and interior of the projection a fastening nut, the fastening nut axially aligned with a bore in the elastomeric member and of greater outside diameter than the bore in the top portion of the projection. A fastening means disposed through a mounting hole in the cab and threadably engaging the fastening nut serves to affix the cab to the mounting device while pre-stressing by compression the elastomeric member to lessen shear forces imposed thereon by the transmission of vibrations from the vehicle frame thereby prolonging the life of the mounting device.