TRUCK SERVICE MANUAL
The rear side gear of the inter-axle differential has splines on the I.D. and engages mating splices of the pinion d
and quill assembly, driving the forward axle. The front side gear of the differential also has splines on the I.D. and
engages the mating splines of the thru-shaft that extends through the pinion and quill assembly and drives the rear axle.
Hypoid drive units of the thru-drive type have pinions that are separable from the thru-shafts and are serviced with
the ' mating gears as matched sets. We assume no responsibility for gears of these types serviced in any manner other
than matched sets. The pinion and quill assembly used with the inter-axle differential of the forward hypoid gear
topmounted drive units is serviced as an assembly with matched hypoid gears.
REMOVE AND DISASSEMBLE DRIVE UNIT
A. small pinch bar may be used to straighten the
REMOVE DRIVE UNIT FROM HOUSING
carrier in the housing bore. However, the end
must be rounded to prevent indenting the carrier
A. Remove plug from bottom of axle housing and
REMOVE AND DISASSEMBLE DIFFERENTIAL
and tapered dowels
Mount drive unit in suitable repair stand
and cut lock wire. Remove cap screws and adjusting nut
IMPORTANT: To loosen the dowels, hold a 1% inch
diameter brass drift against the center of the axle shaft
head, INSIDE THE CIRCULAR DRIVING LUGS. Strike
the drift a sharp blow with a 5 to 6 pound hammer or
sledge. A 1% inch diameter brass hammer is an
excellent and safe drift.
CAUTION: Do not hit the circular driving lugs on the
shaft head this may cause the lugs to shatter and
splinter. Do not use chisels or wedges to loosen the
shaft or dowels this will damage the hub, shaft and oil
C. Remove the axle shaft from the drive unit and
D. Disconnect the forward and rear propeller shafts.
E. Remove carrier to housing stud nuts and
B. Center-punch one differential carrier leg and
bearing cap to correctly identify for proper
F. Break carrier loose from housing with rawhide
mallet and remove tapered dowels. Dowels
C. Remove bearing cap stud nuts or cap screws,
must be removed. If necessary back out studs.
bearing caps and adjusting nuts, split rings (if
used), and bearing cups.
G. Pull carrier straight out of housing with chain fall,
D. Lift out differential and gear assembly.