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MIL-T-62320C
3.3.1 Speeds and gradeability. High and low speed requirements shall be met with the
vehicle loaded to the specified GVW.
3.3.1.1 High speed gradeability. The vehicle shall ascend a continuous grade of 1.5 percent
at 50 miles per hour (mph). Gradeability requirements shall be met with the main transmission
in direct drive and, when a multispeed axle is furnished, with the axle in high speed range.
Gradeability shall be verified with calculations in accordance with SAE J688 (see 6.3).
*  3.3.1.2 Low speed. Low speed for vehicles equipped with a manual transmission shall be
calculated with the engine operating at not less than 35 percent of the recommended governed
speed, and shall provide not more than the vehicle speed (mph) specified in table I for the
corresponding number of available forward speeds.
TABLE I. Vehicle low speed requirement.
Maximum low speed (mph)
Number of forward speeds
4x2 models
4x4 models
4 or 5
4.5
-
8
3.5
3.0
9 or 10
3.0
2.5
*  3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed shall
be not less than 58 mph for model 4x2 vehicles and 55 mph for model 4x4 vehicles.
Conformance to geared speed specified shall be determined by calculations made in accordance
with the following formula:
Maximum geared speed (mph)=
Governed speed (rpm)
Total gear reduction x tire factor (see 6.3)
3.3.2 Service brakes. The service brakes shall control and hold the vehicle when loaded to
its specified GVW on a 30 percent grade. The service brakes shall stop the vehicle, loaded to
specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety
Regulation 393.52.
3.4 Chassis components.
3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or optional
engine for the commercial model truck which meets or exceeds the requirements of this
specification.
*  3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be equipped
with a liquid cooled, compression ignition, two-stroke or four-stroke cycle diesel engine with not
less than four cylinders for 4x2 model and not less than six cylinders for 4x4 model vehicle.
Engine net horsepower used in performance prediction calculations shall be determined in
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