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Automatic or semiautomatic transmission |
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|  MIL-T-62320C
provided with power takeoff opening(s) conforming to SAE J704. The transmission shall provide
for maximum ease of shifting in all speeds. 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 Speeds. The vehicle shall be provided with not less than four forward speeds for
4x2 model vehicles and not less than 8 forward speeds for 4x4 model vehicles.
* 3.4.5.1.2 Transfer case. A transfer case shall be furnished in model 4x4. Unless the transfer
case for 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 type of vehicle
and engine furnished, with the clutch torque capacity exceeding the maximum delivered engine
torque. The clutch lining shall be asbestos free.
3.4.5.3 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. The normal
driving range selector position shall provide not less than four gear ratios without movement of
the selector. The input torque capacity of the transmission shall be at least equal to the
maximum torque delivered by the engine.
3.4.5.4 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
VEHICLE AT HIGHWAY SPEEDS WITH POWER TAKEOFF ENGAGED" shall be installed
so as to be readily visible to the seated driver.
3.4.6 Driveline comments. 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.
3.4.7. Frame. The chassis frame shall be the manufacturer's standard for the model vehicle
furnished. Chassis frame rails shall not project beyond the rear end of the body.
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