MIL-T-62319 Trucks, Cargo: Diesel Or Gasoline Engine Driven, 19,000 To 24,000 Pounds Gvw, 4X2 And 4X4, CommercialThis specification covers diesel or gasoline engine driven, four-wheel, two-rear-wheel drive, and four-wheel, four-wheel drive cargo trucks, having minimum gross vehicle weights GVW of 19,000 to 24,000 pounds, for normal operating conditions. The vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62319C

3.4.4  Exhaust system.  The exhaust system shall conform to Federal Motor Carrier Safety Regulation 393.83.  If vertical exhaust mufflers are furnished a heat shield shall be furnished. Vertical exhaust systems shall be provided with a hinged rain cap.

3.4.5  Gear train.

3.4.5.1  Manual transmission.  Unless otherwise specified (see 3.4.5.3), a manually shifted transmission shall be provided on the vehicle.  Input torque capacity of the transmission shall be at least equal to the maximum torque delivered by the engine.  The transmission shall provide for synchronized shift for at least the three highest forward speeds; or for class D and E vehicles a constant mesh transmission may be provided.  Gear ratios in the transmission and axles shall be matched to provide a progressive shifting pattern throughout the complete range, and shall provide the vehicle performance specified in 3.3.1 through 3.3.1.3.  The transmission shall be provided with power takeoff opening(s) conforming to SAE J704.  The transmission shall

provide for maximum ease of shifting in all speeds.

3.4.5.1.1  Speeds.  The vehicle shall be provided with not less than the number of forward speeds specified in table VI.

TABLE VI.  Minimum number of vehicle forward speeds.

3.4.5.1.2  Transfer case.  On 4x4 model vehicles, unless the transfer case is equipped with devices which compensate for differential torque and speeds between front and rear axles, the transfer case shall provide for driver selection of either two-wheel or four-wheel drive.  When furnished, interaxle compensating devices shall provide for positive transfer of power to all driving axles.  When a two-speed transfer case is furnished, the speedometer shall read accurate speed (mph) with the speed selector in high or low range.

*    3.4.5.2  Clutch.  The clutch shall be the largest capacity clutch offered for the class and model vehicle and engine furnished, with the clutch torque capacity exceeding the maximum delivered engine torque.  The clutch lining shall be of nonasbestos material.

3.4.5.3  Automatic or semiautomatic transmission.  When specified (see 6.2), the vehicle shall be provided with an automatic or semiautomatic transmission.  The transmission shall include a hydraulic torque converter and not less than four forward gear ratios.  Normal driving range selector position shall provide not less than four gear ratios without movement of the

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