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Description (Heavy-Duty Single Speed Rear Axle). The 2%
ton heavy-duty models use a larger rear rucle which has a
spiral bevel ring gear. The differential case is mounted in the
carrier on taper roller
bearings.
The drive pinion is straddle
mounted between straight roller bearings at inner end and
two opposed-taper roller bearings at outer end. Drive to rear
wheels is through studs and tapered dowel rings.
Description (2-Speed Axle). A planetary-reduction type 2-speed
axle is optional on 1% and 2 ton trucks. Torque is transmitted
to the differential case through eight teeth on four planetary
pinions to guarantee long life in severe service. The primary
gears are of hypoid type with large tooth contact areas and
great torque capacity. The drive pinion is straddle mounted.
Axle shafts are equal in length for maximum durability. A
distinctive feature is that only the drivQ pinion and ring gears
operate to produce the high range reduction, the planet and
sun gears being locked to revolve with the ring gear.
In low-range operation the primary (hypoid) reduction is
multiplied by a planetary system reduction ratio of approxi-
mately 1.36:1 for the final drive.
Fig.
48-Two-Sp .. d Ax/.
The secondary reduction occurs only when the sun gear
is held stationary, the four planets then being driven in an
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