 Suspension units and roadwheels remained the M3 vertical volute pattern, with the idler "above" the mounting bracket, rather than the M4 development with the idler moved behind the mounting bracket to give more room for suspension travel.The Ram had a distinctive turret with a bolted flat-faced mantlet and the UK 6 pdr gun, with the hull machine gunner housed in a rotating turret based on the M3 'Lee' cupola, rather than the simpler ball-mount that was becoming universal for tank hull guns.Production facilities for the Ram were constructed at the Montreal Locomotive Works, with the aid of Alco, but the large armor castings for turret and hull were supplied by General Steel Castings in the US.