Chevrolet 30 Series 1967 Service Manual page 202

REAR SUSPENSION AND DRIVE LINE 4-44
Reinstall transmission shift lever knob.
. Route cable to axle shift control valve, insert control
6
cable into valve assembly and tighten conduit retain­
ing fitting to 115 in. lbs.
7. Seat shoulder on control cable knob against housing,
then tighten set screw to retain cable and install
valve-to-bracket retaining screws.
. Connect electrical leads to speedometer adapter and
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fuse block. Make sure all cable retaining clips are
secured.
9. Test operation of shift system.
SPEEDOMETER ADAPTER CONTROL
SWITCH REPLACEMENT
1. Remove the transmission shift lever knob, then re ­
move the two screws retaining switch housing to
transmission shift lever. Remove pin that retains
switch housing to rubber case and slide switch hous­
ing from rubber case.
2. Remove two screws retaining adapter control switch
to switch housing and disconnect electrical leads
from switch (fig. ).
8 8
3. Connect electrical leads to new switch, position and
secure adapter control switch to switch housing with
retaining screws.
4. Reinstall switch housing to rubber case and secure
with pin. Secure switch housing rubber case to
transmission shift lever as specified in Step 5 of
"Vacuum Shift Unit Control Switch Replacement."
5. Test operation of shift system.
REAR AXLE (EATON) SINGLE SPEED
The Eaton 18,500 Single Speed Spiral Bevel Drive rear
axle is used in regular production on the 60 Series truck,
except on flat face cowl models.
Model 17121 and 17101 use an identical differential
head assembly, the only difference being the size of the
ring and pinion gear (fig. 89).
DRIVE PINION AND CAGE
Both axles are equipped with a straddle mounted drive
DRIVE LINE
INDEX
General Description ......................................................... ....4-44
Maintenance and Adjustments
Component Part Replacement
Axle Assembly ............................................................ ... 4_46
Removal .................................................................. ... 4_46
In stallation ............................................................... ... 4-46
Axle Vent R ep lacem en t................................................ ... 4-46
Axle Shaft Removal and Replacem ent........................... ...
Hub and D r u m ............................................................... ... 4-46
GENERAL DESCRIPTION
VACUUM SHIFT UNIT CONTROL SWITCH
HOUSING OR CASE REPLACEMENT
1. Remove the two screws securing the axle shift con­
trol valve to the frame side member mounted
bracket.
NOTf: Do not disconnect control valve vac­
uum, atmosphere or air cleaner lines.
2. Tilt or slide the control valve as required to obtain
access to cable retaining screw and disconnect cable
from valve.
3. Withdraw cable from conduit by pulling shift knob
from switch housing on transmission shift lever.
4. Remove the transmission shift lever knob, then re ­
move the two screws retaining switch housing case to
transmission lever. Transfer conduit and speedom­
eter adapter switch to new housing.
5. Loosely install the new switch housing case in ap­
proximately the same position as the old housing,
and install control cable and knob assembly by feed­
ing end of cable through switch housing and conduit.
. Secure switch housing to transmission lever as spec­
6
ified in Step 5 of "Vacuum Shift Unit Control Switch
Replacement."
7. Seat shoulder on control cable knob against housing,
then tighten set screw to retain cable at the axle shift
control valve, and install valve-to-bracket retaining
screws.
. Test operation of shift system.
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Page
.......................................... ... 4_46
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4 - 4 6
4 _ 4 6
pinion. Pinion bearings are of the opposed tapered roller
bearing type, and are a press fit on the drive pinion shaft.
A straight roller type pilot bearing is pressed onto the
inner end of the drive pinion and seats in a machined bore
in the differential carrier.
Drive pinion bearing preload adjustment is controlled
by thickness of the bearing spacer installed between the
two tapered roller bearings.
Shims between the pinion cage and carrier provide a
means for adjusting pinion depth in the ca rrie r to attain
CHEVROLET TRUCK SERVICE M ANUAL