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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.
Vehicle model
Vehicle class
Number of forward speeds
4x2
C
4
D
5
E
5
4x4
E
9
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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