Transmission R Ep Lacem En T; Turbo Hydra-Matic Diagnosis Procedure; Oil Level And Condition Check; Manual Linkage - Chevrolet 30 Series 1967 Service Manual

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 "0 " ring seal.
b. Oil pan and gasket.
c. Down shift solenoid or connector.
Before raising the car, disconnect the battery and re­
lease the parking brake.
1. Remove propeller shaft.
2. Disconnect speedometer cable,
case connector, vacuum line at modulator, and oil
cooler pipes.
3. Disconnect shift control linkage.
4. Support transmission
jack.
5. Disconnect rear mount from frame crossmember.
. Remove two bolts at each end of frame crossmember
6
and remove crossmember.
7. Remove oil cooler lines, vacuum modulator line,
speedo cable, and detent solenoid connector wire at
transmission.
. Remove converter under pan.
8

TURBO HYDRA-MATIC DIAGNOSIS PROCEDURE

Accurate diagnosis of transmission problems begins
with a thorough understanding of normal transmission
operation. In particular, knowing which units are in­
volved in the various speeds or shifts so that the specific
units or circuits involved in the problem can be isolated
and investigated further.
tect 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
actually corrects the malfunction without requiring the
removal of the transmission.
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 vehi­
TRANSMISSION
electrical lead to
with suitable transmission
Analytical diagnosis will pro­
Details of the items listed
CLUTCHES AND TRANSMISSIONS 7-49
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.
REPLACEMENT
9. Remove converter to flywheel bolts.
10. Loosen exhaust pipe to manifold bolts approximately
1/4 inch, and lower transmission until jack is barely
supporting it.
11. Remove transmission to engine mounting bolts and
remove oil filler tube at transmission.
12. Raise transmission to its normal position, support
engine with jack and slide transmission rearward
from engine and lower it away from vehicle.
CAUTION: 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.
cle. Erratic shifting, pump noise, or other malfunctions
can in some cases be traced to improper oil level.
Oil level should be checked with the selector lever in
the Park (P) position, engine running, and the vehicle on
level pavement.
Fluid level should be to the FULL mark with the trans­
mission at normal operating temperature (170°-190°F.).
With warm fluid (room temperature), the level should be
at or slightly below the ADD mark.
If oil level was low, refer to Oil Leaks.
The condition of the oil is often an indication of whether
the transmission should be removed from the vehicle, or
to make further tests. When checking oil level, a burned
smell and discoloration indicate burned clutches or bands
and the transmission will have to be removed.

MANUAL LINKAGE

Manual linkage adjustment and the associated neutral
safety switch are important from a safety standpoint.
The neutral safety switch should be adjusted so that the
engine will start in the Park and Neutral positions only.
With the selector lever in the Park position, the park­
ing pawl should freely engage and prevent the vehicle
from rolling. The pointer on the indicator quadrant
should line up properly with the range indicators in all
ranges.

OIL LEAKS

Before attempting to correct an oil leak, the actual
source of the leak must be determined. In many cases
CHEVROLET TRUCK SERVICE M ANUAL