KKK-A-1822 E
part of a Class 2 conversion, the differential shall be identical to or heavier duty than the unit
furnished on the OEM's original 4x4 Type I, Class 2 chassis.
3.6.5.3.1 HEAVY-DUTY SKID PLATE (CLASS 2, (4X4)).
Unless otherwise specified (see 6.2-l) and when available from the chassis manufacturer, a
heavy-duty skid plate shall be installed protecting engine, transmission, and transfer case
from ground contact if there is less than 38 cm (15 in.) of clearance to the ground. Skid
plate shall be demountable for servicing the engine and transmission. Openings shall be
provided to enable draining of transmission and servicing the underside of the engine. For
fuel tank protection, see 3.6.4.4.
3.6.5.4 CLUTCH.
Vehicles with manual transmissions shall be furnished with the manufacturer's largest, heavy-
duty clutch available for the engine and model offered.
3.6.5.5 DRIVE-LINE.
The driveline (driveshaft, U-joints, etc.) shall be balanced and supported to perform
throughout the design speed range without whipping or vibrating. Modifications resulting
from lengthening the wheelbase or from 4x4 conversion shall be of chassis manufacturer's
approved design.
3.6.5.6 AXLE, RATINGS, RATIOS.
Axle ratings shall exceed the load imposed on each axle, measured at the ground, when
vehicle is loaded. When specified (see 6.2-l) that the vehicle is used in mountainous terrain,
manufacturer shall provide the highest numerical axle ratio. The chassis OEM "wide dual"
rear axle shall be furnished on dual rear wheel chassis, unless otherwise specified (see 6.2-
m) for a narrow modular body.
3.6.5.7 BRAKE SYSTEMS, SERVICE AND PARKING.
Chassis manufacturer's heaviest duty, power assisted brakes, linings, and parking brake
shall be furnished on the chassis model offered. ABS brakes shall be furnished when available.
When air brakes are furnished, the system shall be designed to provide braking proportional
to the front - rear weight distribution of the fully loaded vehicle. Additionally an air drier
with moisture ejector shall be furnished and shall include a heater to prevent icing.
3.6.5.8 SPECIAL TRACTION (REAR END) DIFFERENTIAL.
Unless otherwise specified (see 6.2-l) or if not available from chassis manufacturer, all
vehicles shall have a positive traction, limited slip differential or automatic, locking type
differential.
3.6.5.9 DRIVE HUBS, FRONT WHEEL, (4X4, CLASS 2).
Unless otherwise specified (see 6.2-l), and when available from the chassis manufacturer,
automatic type front wheel locking hubs shall be provided. Additionally, when a 4x4
conversion is furnished, the heaviest duty front hubs available from the axle manufacturer
shall be furnished.
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