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|  MIL-T-11663K
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3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier
Regulation 393.83. Vertical exhaust systems, if furnished and if capable of being reached easily by
personnel entering or leaving either side of the cab, shall be provided with a heat shield. Vertical
exhaust systems shall be provided with a hinged rain cap.
3.4.4.1 Exhaust system safety shield. The exhaust system or the hydraulic system shall be
shielded so that, in the event of a hydraulic line rupture or hydraulic fluid leak, the hydraulic fluid
will not come into contact with any part of the vehicle exhaust system.
3.4.5 Transmission. Unless otherwise specified (see 3.4.5.2), a manually shifted transmission
with not less than five forward speeds shall be provided. The input torque capacity of the
transmission shall be at least equal to the maximum torque delivered by the engine. When more
than five forward speeds are required, a multispeed transmission or auxiliary transmission may be
provided. Gear ratios in the transmission and axle shall be matched to provide a progressive
shifting pattern throughout the complete range and shall provide the required vehicle performance
(see 3.3.1 through 3.3.1.3). The transmission shall be provided with SAE J704 power takeoff
openings at the right and left sides. The transmission shall provide for maximum ease of shifting
in all speeds.
* 3.4.5.1 Clutch. The clutch shall be the largest capacity clutch offered for the type and class
vehicle and engine furnished, with the clutch torque capacity exceeding the maximum delivered
engine torque.
* 3.4.5.2 Automatic or semiautomatic transmission. When specified (see 6.2), the vehicle shall
be provided with an automatic or semiautomatic transmission. The input torque capacity of the
transmission shall be at least equal to the maximum torque delivered by the engine. The
transmission shall include a hydraulic torque converter and not less than four forward gear ratios.
The normal driving range selector position shall provide not less than four gear ratios without
movement of the selector. The transmission shall be provided with SAE J704 power takeoff
opening(s).
3.4.5.3 Power takeoff. The power takeoff shall be of a rated capacity to operate powered
equipment. Controls to operate the power takeoff shall be located in the truck cab accessible to
the seated driver. A caution plate or decal reading "DO NOT DRIVE VEHICLE WITH POWER
TAKEOFF ENGAGED" shall be installed so as to be readily visible to the seated driver.
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