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|  MIL-T-62021E(AT)
connecting either tank to the engine fuel intake shall be provided and means shall be provided to
monitor the fuel level of either tank from a single fuel gage; or an equalizing pump shall be used
to maintain the same fuel level in both tanks.
*
3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. Exhaust mufflers, when stacked, shall be furnished with a heat shield and a
hinged rain cap.
*
3.4.4.1 Spark Arrester. When specified (see 6.2), a spark arrester conforming to the
material and performance requirements of SAE J350 shall be furnished, except for turbocharged
engines. The spark arrester shall have an 80 percent arresting efficiency when rated in accordance
*
3.4.5 Transmission. Unless a manual transmission is specified, the vehicle shall be
equipped with an automatic transmission. When specified (see 6.2), the vehicle shall be equipped
with a manual transmission, complete with clutch. The input torque capacity of the transmission
shall be at least equal to the maximum torque delivered by the engine. The transmission and axle
gear ratios shall be selected to provide the performance specified in 3.3.1 through 3.3.1.3.
*
3.4.5.1 Automatic transmission. The automatic 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 selector. The
transmission shall be provided with a power takeoff opening. The net torque capacity and the net
power rating of the transmission shall exceed the output ratings of the engine.
*
3.4.5.2 Manual transmission. The manual transmission and other vehicle equipment shall
provide not less than five forward vehicle speeds. Gear ratios in the transmission and axle shall
be matched to provide a progressive shifting pattern throughout the complete range. 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.
*
3.4.5.2.1 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. The clutch lining shall be asbestos free.
3.4.5.2 Power takeoff. When a power takeoff is furnished, it 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 OPERATE
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