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Table V. Transmission requirements, minimum number of forward speeds |
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|  MIL-T-46765(AT)
* 3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. Vertical exhaust mufflers, capable of being reached easily by personnel
entering or leaving either side of the cab, shall be furnished with a heat shield. Vertical exhaust
systems shall be provided with a hinged rain cap.
3.4.5 Transmission. Unless otherwise specified (see 3.4.5.2), 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 vehicle shall be provided
with not less than the number of forward speeds specified in table V. When more than five
forward speeds are required, a multispeed transmission, auxiliary transmission or two-speed
axles shall be provided. Gear ratios in transmissions and axles shall be matched to provide a
progressive shifting pattern throughout the complete range, and shall provide required vehicle
performance (see 3.3.1). The transmission shall provide for maximum ease of shifting in all
speeds. The transmission shall be provided with SAE J704 power takeoff openings at right and
left sides.
Table V. Transmission requirements, minimum number of forward speeds.
Vehicle size
Minimum number of forward speeds
1200
5
2000
9
*
* 3.4.5.1 Clutch. The clutch shall be the largest capacity clutch offered for the size vehicle
and engine furnished with clutch torque capacity exceeding maximum delivered engine torque.
The clutch lining shall be asbestos free. The clutch on size 2000 vehicle shall have spring
dampening and a greaseable bearing.
* 3.4.5.2 Automatic transmission. When specified (see 6.2), an automatic transmission shall
be furnished. The transmission shall include a hydraulic torque convertor and not less than four
forward gear ratios. Normal driving range selector position shall provide not less than four
forward gear ratios without movement of the selector. The transmission shall have a power
takeoff opening.
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 OPERATE VEHICLE AT
HIGHWAY SPEEDS WITH POWER TAKEOFF ENGAGED" shall be provided and installed
so as to be readily visible to the seated driver.
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