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*  3.4.9 Axles. Axle ratings shall be at least equal to the load imposed on each axle, measured
at the ground, with the vehicle loaded to specified GVW. Vehicles provided with automatic or
semiautomatic transmission shall be equipped with a single-speed axle. Unless a two-speed axle
is furnished, a single reduction rear axle shall be provided. When specified (see 6.2), the wheel
bearings and axle spindles shall be oil lubricated. The hubcaps shall have a window for visual
determination of oil level. Provisions for venting or withstanding internal pressure buildup and
for replenishing the oil supply shall be provided. Two-speed axle. Unless an automatic or semiautomatic transmission is furnished, a
two-speed axle shall be furnished, equipped with electric, vacuum or air shift and provided with
ratios which will permit proper gear splitting. The gear ratios shall provide the performance
specified in 3.3.1 through Traction control. When specified (see 6.2), the vehicle shall be furnished with a
traction control on the rear axle. The traction control shall actuate automatically to ensure that
power is transmitted to the wheel having traction when the opposite wheel loses traction.
Maximum traction capabilities shall be maintained at all times under each drive wheel for the life
of the vehicle.
*  3.4.10 Wheels, rims, tires and tubes. Unless wide base tires are specified, the vehicle shall
be equipped with single front and dual rear wheels. Except as specified herein, rims and tire
ratings shall conform to Tire and Rim Association recommendations for the type and size of tires
furnished. Rim and disc wheel sizes shall be the same for all wheels on each vehicle. Tire size
and load range (ply rating) shall be the same for all tires on each vehicle. When specified
(see 6.2), wide base type tires and wheels for the front and rear axles shall be provided in lieu of
conventional front and dual rear wheels and tires. Wide base wheels shall be interchangeable
without the use of an adapter. When specified (see 6.2), disc type wheels shall be furnished.
* Tires. Unless otherwise specified (see 6.2), tires shall be steel belted radial tube or
tubeless type with highway tread. Tires shall be of rated capacity at least equal to the load
imposed on each tire, measured at each wheel, at the ground, with the vehicle loaded to specified
GVW. Tires shall conform to Tire and Rim Association recommendations, or to ZZ-T-381 with
a size designation system the same as the Tire and Rim Association. Inner tubes. When tube type tires are furnished, inner tubes shall be of heavy duty
type, and shall be of the proper size for the tires furnished. Tire flaps shall be provided for tube
type tires in accordance with Tire and Rim Association recommendations.

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