Chevrolet 10 Series 1968, Service Manual

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CLUTCHES AND TRANSMISSIONS 7-48
9. Remove parking pawl shaft, cup plug parking pawl
shaft, and parking pawl.
Installation
Installation of the parking linkage is the reverse of the
removal. Use new seal and cup plug, if removed, and new
bottom pan gasket.
REAR SEAL
Removal
1. Remove propeller shaft.
2. Pry seal out with screw driver.
Installation
1. Using Tool J-5154 or J-21359 install new seal.
2. Re-install propeller shaft.
OTHER SERVICE WITH TRANSMISSION IN VEHICLE
The following operations when done as single opera­
tions and not as part of a general overhaul should, as a
practical matter, be performed with the transmission in
the vehicle. Refer to the "Transmission Disassembly
and Reassembly” section of the Overhaul Manual for
service procedures.
a. Oil filler pipe and
“ O”
ring seal.
b. Oil pan and gasket.
c. Down shift solenoid or connector.
d. Valve body spacer plate, gasket and check balls.
e. Front accumulator piston.
f . Rear servo and rear accumulator assembly.
g. Rear band apply checking with Tool J -21370.
h. Front servo assembly.
i . Speedo driven gear.
j . Case extension or gasket,
k. Strainer and "O ” ring
0
TRANSMISSION
Before raising the truck, disconnect the battery and re­
lease the parking brake.
1. Place truck on hoist.
2„ Remove propeller shaft.
3. Disconnect speedometer cable, electrical lead to
case connector, vacuum line at modulator, and oil
cooler pipeSo
4. Disconnect shift control linkage.
5. Support transmission with suitable transmission
jack.
6 . Disconnect rear mount from frame crossmember.
7. Remove two bolts at each end of frame crossmember
and remove crossmember.
8 . Remove oil cooler lines, vacuum modulator line,
speedo cable, and detent solenoid connector wire at
transmission.
9. Remove converter under pan.
10. Remove converter to flywheel bolts.
11. Loosen exhaust pipe to manifold bolts approximately
1/4 inch, and lower transmission until jack is barely
supporting it.
12. Remove transmission to engine mounting bolts and
remove oil fille r tube at transmission.
REPLACEMENT
13. Raise transmission to its normal position, support
engine with jack and slide transmission rearward
from engine and lower it away from vehicle.
C A U TIO N : Use converter holding Tool J-5384
when lowering transmission or keep rear of
transmission lower than front so as not to lose
converter.
The installation of the transmission is the reverse
of the removal with the following additional steps.
Before installing the flex plate to converter bolts,
make certain that the weld nuts on the converter are
flush with the flex plate and the converter rotates
freely by hand in this position. Then, hand start all
three bolts and tighten finger tight before torquing to
specification. This will insure proper converter
alignment.
NOTE:
After installation of transmission check
linkage for proper adjustment.
14. Remove truck from hoist.
TURBO HYDRA-MATIC
Accurate diagnosis of transmission problems begins
with a thorough understanding of normal transmission
operation. In particular, knowing which units are involved
in the various speeds or shifts so that the specific units
or circuits involved in the problem can be isolated and
investigated further. Analytical diagnosis will protect the
technician from come backs and certainly will improve
owner satisfaction.
An important and often overlooked aspect of diagnosis
is finding out specifically what the customer is complain­
ing of. For this purpose a short ride with the customer
will often prove beneficial. It may be found that the con­
dition the customer wants corrected is standard and
should not be altered.
The following sequence, based on field experience, pro­
vides the desired information quickly and in most cases
DIAGNOSIS PROCEDURE
actually corrects the malfunction without requiring the
removal of the transmission. Details of the items listed
in this sequence are covered further in the text.
SEQUENCE FOR TURBO HYDRA-MATIC
DIAGNOSIS PROCEDURE
1. Check oil level and condition.
2. Check and correct detent switch.
3. Check and correct vacuum line and fittings.
4. Check and correct manual linkage.
OIL LEVEL AND CONDITION CHECK
Always check the oil level before road testing. Oil
must be visible on dip stick prior to operating the vehicle.
CHEVROLET TRUCK SERVICE MANUAL