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|  MIL-T-12407X(AT)
3.4.3.1 Air cleaner. An air cleaner shall be furnished.
3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. The exhaust tailpipe shall extend to the rear of the body or to the side behind
the rear wheels, and shall be so located as to minimize the possibility of exhaust fumes entering
the body.
3.4.5 Gear train. The gear train and components torque capacity shall be adequate to
transmit the maximum delivered torque of the engine, as developed through the maximum gear
train reduction.
*
3.4.5.1 Automatic transmission. Unless otherwise specified, (see 3.4.5.2), the vehicle
shall be provided with an automatic transmission. The input torque capacity of the transmission
shall be at least equal to the maximum torque delivered by the engine. The transmission shall have
not less than three forward gear ratios and one reverse gear ratio. The transmission shall include
a hydraulic torque converter and an oil cooler.
*
3.4.5.2 Manual transmission. When specified (see 6.2), a manually shifted transmission
shall be provided. The input torque capacity of the transmission shall be at least equal to the
maximum torque delivered by the engine. The transmission shall have not less than three forward
speeds and one reverse speed. The transmission shall provide for the maximum ease of shifting
with synchronized shift for at least the two highest forward speeds. Transmission and axle gear
ratios shall be selected to provide the performance specified in 3.3.1 through 3.3.1.2.
*
3.4.5.3 Clutch. The clutch shall be the largest capacity clutch offered for the type of
vehicle and size of engine furnished, with the clutch torque capacity exceeding the maximum
delivered engine torque. The clutch lining shall be asbestos free.
*
3.4.5.4 Transfer case. Model 4x4 vehicles shall be provided with a two-speed transfer
case. The transfer case shall provide for driver selection of either two-wheel or four-wheel drive.
The speedometer shall read accurate speed (mph) with the speed selector in high or low range.
3.4.6 Driveline components. The driveline components shall be adequate to transmit the
maximum delivered torque of the engine, as developed through the maximum gear train reduction,
in proportion to the number of driving axles furnished.
3.4.6.1 Heavy duty skid plate (model 4x4). Unless otherwise specified (see 6.2), a heavy
duty skid plate shall be installed protecting the engine and transmission (from ground contact) if
there is less than 15 inches of clearance to the ground. The skid plate shall be demountable for
servicing the engine and the transmission. Openings shall be provided to enable draining of the
transmission and servicing the underside of the engine.
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