Grizzly I cruiser

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Grizzly I
Grizzly
Type	Medium tank
Place of origin	Canada
Service history
In service	1943–1945 (Canada) 1954–1980s (Portugal)
Used by	Canada Portugal
Wars	World War II
Production history
Designed	1941
Manufacturer	Montreal Locomotive Works
Produced	1943–1944
No. built	188
Specifications
Mass	29.91 t (30 tonnes)
Length	19 ft (5.816 m)
Width	2.626 m (8 ft 7.4 in)
Height	2.997 m (9 ft 10.0 in)
Crew	5 (Commander, gunner, loader, driver, co-driver/hull gunner)
Armour	75 mm
Main armament	75 mm M3 L/40 gun
Secondary armament	2 × .30-06 M1919 Browning machine gun
Engine	Continental R-975 9-cylinder radial gas 400/340 hp (298/254 kW)
Suspension	Vertical volute spring
Operational range	193 km (120 mi)
Maximum speed	24 mph (39 km/h)

The Grizzly I was a Canadian-built M4A1 Sherman tank with relatively minor modifications, primarily to stowage and pioneer tool location and adding accommodations for a Number 19 radio set. They used the same General Steel hull castings as late Pressed Steel-built M4A1(75)s, to include both the standard hull and the later ones with the armour thickened over the ammo bins. Grizzlies were originally built with US style tracks and sprockets. It was only later that they were refitted with Canadian Dry Pin (CDP) tracks, which did not require rubber.

The tank's production was stopped as it became apparent US production would be sufficient for the Allies' needs and the factory was turned over to other production. After the war, a number of Grizzly tanks were sold to Portugal as part of the NATO military assistance program; they were retired in the 1980s.