[quote 
The M-18 was most certainly NOT "the fastest thing on treads in WWII".     
[/quote]
just found this on wiki and i was watching tank overall and it was about the m 18 hellcat
76 mm Gun Motor Carriage M18
Type Tank destroyer 
Place of origin  United States 
Service history 
In service 1944-1957 (USA) 
Specifications 
Weight 17.7 metric tons (39,000 lb) 
Length 6.68 m (21.9 ft) (with gun)
5.28 m (17.3 ft) (without gun) 
Width 2.87 m (9.4 ft) 
Height 2.57 m (8.4 ft) 
Crew 5 (Commander, gunner, loader, driver, co-driver) 
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Armor 5 to 25 mm (0.2 to 1.0 in) 
Primary weapon 1× 76 mm (76.2 mm) M1A1 gun
45 rounds 
Secondary
weapon 1× .50 cal M2HB machine gun
800 rounds 
Engine Continental R-975-C4, 9-cylinder, radial piston gasoline engine
340 hp (253 kW) 
Power/weight 18.9 hp/t 
Suspension Torsion bar 
Operational
range 168 km (105 mi) 
Speed up to 97 km/h (60 mph, maximum road