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MIL-T-62145E
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3.2.10 Asbestos. Asbestos materials shall not be used in any form in any part of the vehicle.
3.3 Performance.
3.3.1 Speeds and gradeability. High and low speed requirements shall be met with the
vehicle loaded to specified GVW.
3.3.1.1 High speed gradeability. The vehicle shall ascend continuous grades specified in
table III at 50 miles per hour (mph). Gradeability requirements shall be met with the main
transmission in direct drive, and when a multi-speed axle or auxiliary transmission is furnished,
with the axle or auxiliary transmission in high speed ratio. Gradeability shall be verified with
calculations in accordance with SAE J688 (see 6.3).
TABLE III. Gradeability.
Vehicle model
Percent grade
4x2
1.00
6x4
0.50
3.3.1.2 Low speed. Low speed for vehicles 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 specified (mph) in table IV for the corresponding
number of available forward speeds.
TABLE IV. Vehicle low speed requirement.
Number of forward speeds
Maximum low speed (mph)
5
4.5
7 or 8
3.5
9 or 10
3.0
3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed shall
be not less than 58 mph. Conformance to geared speed specified shall be determined by
calculating 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.
9

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