 A similar vehicle was developed in Canada from January 1941, known as the Ram tank.Like the Sherman, this developed from the M3 Lee's chassis and its powertrain, but like the Sherman, was based with a fully rotating turret.One improvement was the use of all-steel 'CDP' (Canadian Dry Pin) tracks, which although an inch narrower than the early M4 steel and rubber pad tracks, were cheaper to produce and gave better traction.