A-A-58028D
a. A system which opens all or some of the engine exhaust valves near the end of the
compression stroke, thereby converting vehicle motion to a pumping loss. The engine
brake shall be approved by the engine manufacturer.
b. A hydrodynamic retarder integral with the transmission.
A dash mounted switch shall be provided to activate, modulate, or cut out the brake
augmentation. The switch shall be marked to indicate its position. When active, the system shall
be fully controlled by means of the conventional driving controls to apply retardation during
vehicle deceleration, and to cut it out in the other operating modes.
2.2.5 Tires and wheels.
2.2.5.1 4x2 version. The 4x2 version shall be equipped with single tires on the front axle and
dual tires on the rear axle. The vehicle shall be equipped with tubeless steel radial tires with
on/off-road type tread mounted on steel disc wheel assemblies. If all tire and wheel assemblies
are identical, one spare tire and wheel assembly shall be provided. If two different tire and wheel
assemblies are provided, two spare tire and wheel assemblies shall be provided, one of each
configuration. Spare tires and wheels are not required to be mounted on the vehicle. The
assembly (mounted tire on rim) shall be shipped as loose equipment.
2.2.5.2 4x4 version. The 4x4 version shall be equipped with single tires on the front axle and
dual tires on the rear axle. The vehicle shall be equipped with tubeless steel radial tires with
on/off-road type tread mounted on steel disc wheel assemblies. Tire and wheel assemblies shall
be identical at all positions. A spare tire and wheel assembly shall be provided; however, it is not
required to be mounted on the vehicle. The spare tire(s) and rim(s) shall be inventoried, crated
and shipped as loose equipment.
2.2.6 Tire chains. When specified (see 6.2), the 4x2 version shall be equipped with driver
activated automatic type tire chains for the rear axle.
2.2.7 Fenders. Rear fenders and fender liners having tire chain clearance shall be provided.
Chrome fender flairs shall be provided at all wheel locations.
2.2.8 Steering. The vehicle shall be equipped with power steering.
2.2.9 Transmission. A fully automatic transmission with a hydraulic torque converter and at least
five forward speeds shall be provided. The normal driving range selector position shall provide
at least four gear ratios without movement of the selector. The net torque capacity and the net
power rating of the transmission shall exceed the output ratings of the engine.
2.2.10 Traction control. The 4x2 version shall be equipped with a limited slip or automatic
locking differential. The 4x4 version shall be equipped with limited slip, automatic locking, or
driver controlled, air actuated, locking differentials in the rear axle and between the axles.
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