1967 CHEVROLET CAMARO service

CLUTCH AND TRANSMISSIONS
7-28

.PAWL
ROD (E)

DETENT
(F)

LOAD(Y)

NUT (A)

Fig.
6PG
-
Chevrolet Floor Shift Linkage Adjustment

DRIVE

POSITION

// CONTACT

POINT
Z

v ACTUATING
4./
VIEW
A

\ LEVER
G
ACTUATING LEVER (F)

LOAD{G)
1

ROD
(QSyYi-LOAD
(H)

NUT (D)
/tl—SPACER

/Hh-09

SWIVEL'

VIEW
A

#^
POINT
OF
V

CONTACT
(G)\\

A

DETENT (K)H^

¥
VUULPAWL

VIEW
B

y DETENT (K)

Fig.
7PG
-
Chevelle Floor Shift Linkage Adjustment

Fig.
SPG
-
Chevy
II
Floor Shift Linkage Adjustment

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-29

ROD
(E)~X\

or

POINT OF-i-7V

CONTACT
i

(2)
-

VIEW

^ROD
(C

LLEVER
r-D

I

j

.——j

A

{

(D)
ETENT

FWD.

B
\_
(?) LOAD (X)

SWIVEL (J)-\

ROD(CK V

NUT (B)-—-^

SPACER
(H)-^
K

/ / n

/LOAD (Y)

I^-NUT
(A)

k-.O94

/^A
VIEWB

L-DETENT
(F)

AQUATING LEVER

-PART
OF
LEVER
&
(G)

BRKT. ASM.

Fig.
10PG - Corvette Gear Shift Control Adjustment

Fig.
9PG - Comoro Floor Shift Linkage Adjustment

The foregoing procedure will provide a .050" over

travel gap in the notches of Detent (F).

Corvette Linkage Adjustment (Fig. 10PG)

1.
Set Transmission Bell Crank (E) in "PARK" position.

2.
Set Control Shaft Lever (A) in "PARK" position.

3.
Install Clevis (D) on Rod (B) loosely, attach Rod to

Bell Crank (E) and secure with retainer.

4.
With Lever (A) in "PARK'? position, adjust Clevis

at Lever (A) until clevis pin passes freely through

holes and secure with washer and cotter pin.

5. Check shifts to insure proper operation. Readjust

Clevis as necessary.

Corvette Powerglide Control Lever

and Bracket Assembly

Powerglide control lever and bracket assembly is a

straight line shift type, mounted to the floor of the body

rather than the transmission extension as in the past.

Shifting from one detent position to another is done by

depressing a round button located in the center of the

spherical' shift lever knob. If disassembly of this control

lever and bracket assembly is necessary, refer to Figure

11PG for parts breakdown and relative positioning for

assembly.

Floor Mounted Control Lever

and Bracket Assembly (Exc. Corvette)

If disassembly of this control lever and bracket as-

sembly is necessary, refer to Figure 12PG for parts

break down and relative positioning for assembly.
Throttle Valve Linkage Adjustment

L-4 and L-6 Models

With accelerator pedal depressed, Bell Crank on L-4

and L-6 models must be at wide open throttle position.

Dash Lever must be 1/64"-1/16" off Lever Stop and

Transmission Lever must be against transmission in-

ternal stop.

Fig.
11PG - Corvette Control Lever and

Bracket Assembly - Exploded

CHEVtOLET CHASSIS SERVICE

CLUTCH AND TRANSMISSIONS
7*30

V-8 Models-With Uni-Directional Linkage

1.
Remove air cleaner.

2.
Disconnect accelerator linkage at carburetor.

3.
Disconnect accelerator return and TV rod return

springs.

4.
With right hand, pull TV upper rod forward until

transmission is through detent. With left hand, open

carburetor to wide open throttle position. Carbure-

tor must reach wide open throttle position at the

same time the ball stud contacts end of slot in upper

TV rod.

5. Adjust swivel on end of upper TV rod to obtain set-

ting described in Step 4. Allowable tolerance is

approximately 1/32".

6. Connect and adjust accelerator linkage as described

in Section 6.

7. Check for throttle linkage freedom.

Neutral Safety Switch Adjustment

The adjustment at the neutral safety switch is de-

scribed in the Electrical Section 12.

Throttle Return Check Valve (Dashpot) Adjustment

The adjustment of the throttle return check valve is

described in Section 6M for each carburetor installation.
Fig.
12PG - Floor Mounted Control Lever and

Bracket Assembly (Chevrolet Shown)

COMPONENT PARTS REPLACEMENT

TRANSMISSION REPLACEMENT (EXC. CORVETTE)

Removal

1.
Raise car on hoist (preferably) or on stand jack and

remove oil pan drain plug to drain oil.

NOTE:
If desired, the oil may be drained after

transmission removal.

2.
Disconnect the oil cooler lines (external cooled

models), vacuum modulator line and the speedometer

drive cable fitting at the transmission. Tie lines

out of the way.

3.
Disconnect manual and TV control lever rods from

transmission.

4.
Disconnect propeller shaft from transmission.

5. Install suitable transmission lift equipment to jack

or other lifting device and attach on transmission.

6. Disconnect engine rear mount on transmission ex-

tension, then disconnect the transmission support

crossmember and slide rearward.

7. Remove converter underpan, scribe flywheel-con-

verter relationship for assembly, then remove the

flywheel-to-converter attaching bolts.

NOTE:
The "light" side of the converter is

denoted by a "blue" stripe painted across the

ends of the converter cover and housing. This

marking should be aligned as closely as possible

with the "white" stripe painted on the. engine

side of the flywheel outer rim (heavy side of

engine) to maintain balance.

8. Support engine at the oil pan rail with a jack or other

suitable brace capable of supporting the engine

weight when the transmission is removed.
9. Lower the rear of the transmission slightly so that

the upper transmission housing-to-engine attaching

bolts can be reached using a universal socket and a

long extension. Remove upper bolts.

CAUTION: Oh V-8 engines, care must be taken

not to lower rear of transmission too far as the

distributor housing may be forced against the

dash causing damage to the distributor. It is

best to have an assistant observe clearance of

all upper engine components while the trans-

mission rear end is being lowered.

10.
Remove remainder of transmission housing-to-

engine attaching bolts.

11.
Remove the transmission by moving it slightly to the

rear and downward, then remove from beneath the

car and transfer to a work bench.

NOTE:
Observe converter when moving the

transmission rearward. If it does not move

with the transmission, pry it free of flywheel

before proceeding.

CAUTION: Keep front of transmission upward

to prevent the converter from falling out. Install

converter Tool J-9549 (or a similar tool con-

structed as shown in Figure 13PG, or, in an

emergency, a length of strong wire may be used)

immediately after removal from the engine.

Installation

NOTE:
The "light" side, of the converter is

denoted by a "blue" stripe painted across the

ends of the converter cover and housing. This

marking should be aligned as closely as possible

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-31

with the "white" stripe painted on the engine

side of the flywheel outer rim, denoting the

"heavy" side of the engine.

1.
Mount transmission on transmission lifting equip-

ment installed on jack or other lifting device.

2.
Remove converter holding tool.

CAUTION: Do not permit converter to move

forward after removal of holding tool.

3.
Raise transmission into place at rear of engine and

install transmission case to engine upper mounting

bolts,
then install remainder of the mounting*bolts.

Torque bolts to 35 ft. lbs.

4.
Remove support from beneath engine, then raise

rear of transmission to final position.

5. Through flywheel cover opening align as closely as

possible the "white" flywheel balance mark stripe

and the "blue" painted stripe on the end of converter

cover and housing. If scribed during removal, align

scribe marks on flywheel and converter cover. In-

stall converter to flywheel attaching bolts. Torque

bolts to 15-20 ft. lbs.

6. Install converter under pan.

7. Reinstall transmission support crossmember to

transmission and frame.

8. Remove transmission lift equipment.

9. Connect propeller shaft to transmissions.

10.
Connect manual and TV control lever rods to

transmission.

11.
Connect oil cooler lines (if so equipped), vacuum

Fig.
13PG - Converter Holding Tool
modulato:* line, and speedometer drive cable to

transmission.

12.
Refill transmission through filler tube, using Funnel

J-4264 and following the recommended procedure

provided earlier in this section.

13.
Check transmission for proper operation and for

leakage. Check and, if necessary, adjust linkage.

CORVETTE POWERGLIDE TRANSMISSION

Replacement

1.
Disconnect battery ground cable.

2.
Remove ball end from transmission shift control

lever.

3.
Raise front and rear of vehicle.

4.
Insert a block of wood between the top of the dif-

ferential carrier housing and the underbody (to

prevent upward travel of the carrier when the car-

rier front support is disconnected).

5. Disconnect the differential carrier front support

from its frame bracket, by removing the nut on the

underside of the biscuit mount.

6. Pry the carrier downward to relieve load while re-

moving the two center mounting bolts from the

carrier front support. (To pry carrier downward

insert crowfoot end of a pry bar**hrough the open-

ing in the carrier front support, hooking end of bar

over top of the center mounting bolt pad cast in the

underside of the carrier).

7. Pivot carrier support downward for access to prop

shaft "U"-joint.

8. Disconnect prop shaft front and then rear
"U"
bolts.

9. Disconnect parking brake cable from ball socket at

idler lever located near center of underbody.

10.
Remove prop shaft by moving shaft forward.

11.
Remove left bank exhaust pipe.

12.
Remove right bank exhaust pipe and heat riser.

13.
Disassemble the transmission mount, as follows:

a. Remove the two bolts that attach rear mount

cushion to the rear mount bracket.

b.
Support engine under oil pan and raise engine to

remove load from rear mount cushion.

CAUTION: To avoid damage to oil pan, a suit-

able wide base, heavy wood platform should be

placed between the jack pad and the oil pan.

c. Remove the three transmission mount bracket-

to-crossmember bolts, then remove mount

bracket.

d. Remove the two bolts from mount pad to trans-

mission case and remove rubber mount cushion

and exhaust pipe "yoke".

14.
Disconnect oil cooler lines at transmission and

swing lines clear.

15.
Remove connector underpan.

16.
Remove converter to flywheel attaching bolts.

17.
At transmission disconnect vacuum modulator line

and speedometer cable.

18.
Disconnect transmission shift linkage from trans-

mission gearshift control lever. Remove shift lever.

19.
At transmission, remove throttle valve linkage and

disconnect neutral safety switch linkage, also re-

move the gearshift control linkage.

20.
Remove neutral safety switch from transmission

control bracket.

CHEVROLET CHASSIS SERVICE

CLUTCH AND TRANSMISSIONS 7-32

21.
Remove transmission output shaft slip yoke and in-

sert a plastic shipping plug in end of extension to

prevent spillage of transmission fluid.

NOTE:
The yoke is removed to avoid tearing

the heat reflecting pad on the underbbdy, when

the transmission is being removed.

22.
Remove bright metal ignition shielding from dis-

tributor area.

23.
Remove the transmission dip stick and tube

assembly.

24.
Disconnect transmission vacuum modulator line at

distributor advance line tee.

25.
Position transmission hoist under transmission and

attach safety chain to transmission.

26.
Remove transmission converter housing-to-engine

attaching foolts and slide transmission rearward.
NOTE:
Observe converter when moving trans-

mission rearward. If converter does not move

with the transmission, pry it free of flywheel

before proceeding.

27.
Install converter retaining strap.

28.
Lower and remove transmission from vehicle by

tilting the front down and to the right while inter-

mittently lowering the transmission to facilitate its

• removal.

29.
Reinstall transmission assembly by performing the

above steps in reverse order.

Bolt Torques

Transmission Case to Flywheel

Housing Bolts 35 ft. lbs.

Converter to Flywheel Bolts. . , . . 35 ft. lbs.

OTHER SERVICE OPERATIONS

Although certain operations, such as oil pan or gasket

replacement, valve body, governor, filler pipe "O" ring,

speedometer drive gear, case extension "0" ring and

rear oil seal, vacuum modulator, and servo cover or

gasket service may be performed from underneath the
vehicle without removing the Powerglide; their service

procedure is covered in the Passenger Overhaul Manual

and is not repeated here. Refer to the- Powerglide Sec-

tion of the Passenger Overhaul Manual for all other

service operations not covered here.

DIAGNOSIS

Proper operation of the Powerglide transmission may

be affected by a number of factors, all of which must be

considered when trouble in the unit is diagnosed.

Proper trouble diagnosis can only be accomplished

when performed in a thorough step by step procedure.

The following procedure has been devised and tested and

is recommended for all trouble diagnosis complaints and

if the service man will follow this checking procedure,

accurate and dependable diagnosis may be accomplished.

This will result in a savings of time, not only to the

service man, but to the customer as well.

WARMING UP TRANSMISSION

Before attempting to check and/or correct any com-

plaints on the Powerglide transmission it is absolutely

essential that the oil level be checked and corrected if

necessary. An oil level which is either too high or too

low can be the cause of a number of abnormal conditions

from excessive noise to slippage in all ranges.

It must be remembered that cold oil will slow up the

action of the hydraulic controls in the transmission. For

this reason a trouble or oil leak diagnosis should not be

attempted until the transmission has been warmed up by

either of the following procedures:

Shop Warm Up

1.
Connect tachometer to engine.

2.
Set parking brake tight and start engine.

3.
Place selector light in
"D"
(drive) range.

4.
Adjust carburetor idle speed adjusting screw to run

engine at approximately 750 rpm and operate in this

manner for two minutes. At the end of two minutes

of operation, the transmission will be sufficiently

warmed up for diagnosis purposes.
NOTE:
At this point, readjust the engine idle

speed to 450-475 rpm in
"D"
range.

Road Warm Up

Drive the car approximately 5 miles with frequent

starts and stops.

NOTE:
At this point, make sure the engine idle

speed is set to 450-475 rpm in
"D"
range.

CHECKING FLUID LEVEL AND CONDITION

After transmission has been warmed up, check the

fluid level with the engine idling, parking brake set and

control lever in "N" (neutral). If the fluid level is low,

add fluid to bring level up to the full mark on gauge rod,

CAUTION: If fluid level is too high, fluid may

be aerated by the planet carrier. Aerated fluid

will cause turbulence in the converter which will

result in lost power, lower stall speed and lower

pressures in control circuits. Lower fluid level

to full mark, then shut off engine to allow air

bubbles to work out of fluid.

When checking oil level, aburned smell and discolora-

tion indicate burned clutches or bands and the transmis-

sion 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

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-33

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

the source of the leak can be deceiving due to "wind flow1 f

around the engine and transmission.

The suspected area should be wiped clean of all oil

before inspecting for the source of the leak. Red dye is

used in the transmission oil at the assembly plant and

will indicate if the oil leak is from the transmission.

The use of a "black light"* to identify the oil at the

source of leak is also helpful. Comparing the oil from

the leak to that on the engine or transmission dip stick

(when viewed by black light) will determine the source

of the leak.

Oil leaks around the engine and transmission are gen-

erally carried toward the rear of the car by the air

stream. For example, a transmission "oil filter tube

to case leak" will sometimes appear as a leak at the

rear of the transmission. In determining the source of

an oil leak it is most helpful to keep the engine running.

The mating surfaces of servo cover, converter housing,

transmission case and transmission case extension

should be carefully examined for signs of leakage. The

vacuum modulator must also be checked to insure that

the diaphragm has not ruptured as this would allow trans-

mission oil to be drawn into the intake manifold. Us-

ually, the exhaust will be excessively smoky if the

diaphragm ruptures due to the transmission oil added to

the combustion. The transmission case extension rear

oil seal should also be checked. All test plugs should be

checked to make sure that they are tight and that there

is no sign of leakage at these points. The converter

underpan should also be removed. Any appreciable quan-

tity of oil in this area would indicate leakage at the pump

square seal ring, pump seal assembly, or pump bolt

sealing washers.

BASIC PRESSURE CHECKS

Four basic pressure checks are used for diagnosis and

operational checks for the Aluminum Powerglide trans-

mission. All checks should be made only after thoroughly

warming up the transmission.

• Wide Open Throttle Upshift Pressure.

• Idle Pressure in "Drive" Range.

• Manual "Low" Range Pressure.

• "Drive" Range Overrun (Coast) Pressure.

It is not recommended that stall tests be conducted

which would result in engine vacuum falling below 10" Hg.

Pressure gauge hose connections should be made at

the low servo apply (main line) test point (fig. 14PG).

Run the gauge line into the driving compartment by

pushing aside the mast jacket seal. The line out of the

way of the drivers feet and connect to pressure gauge

J-21867.

• Wide Open Throttle Upshift Pressure Check

Refer to the pressure check chart for upshift pressure
SERVO APPLY

PRESSURE

Fig.
14PG - Pressure Test Plug

points as indicated on the lower servo apply (main line)

gauge.

• Idle Pressure in "Drive" Range

In addition tp the oil pressure gauges, a vacuum gauge

is needed for this check.

With the parking brake applied and the shift selector

lever in "Drive", low servo apply (main line) pressure

should be as shown on the pressure check chart.

If pressures are not within these ranges, the following

items should be checked for oil circuit leakage:

1.
Pressure regulator valve stuck.

2.
Vacuum modulator valve stuck.

3.
Hydraulic modulator valve stuck.

4.
Leak at low servo piston ring (between ring and

bore).

5.
Leak at low servo piston rod (between rod and bore).

6. Leak at valve body to case gasket.

7.
Leak at valve body gaskets.

8. Front pump clearances.

9. Check passages in transmission case for porosity.

• Manual "Low" Range Pressure Check

Connect a tachometer, apply the parking brake, place

the selector lever in "Low" range, and adjust the engine

speed to 1000 rpm with the car stationary.

Low servo apply (main line) pressure should be as

shown on the pressure check chart.

Pressures not within this range can indicate the fol-

lowing possibilities:

1.
Partially plugged oil suction screen.

2.
Broken or damaged ring low servo.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-34

3.
Pressure regulator valve stuck.

4.
Leak at valve body to case gasket.

5.
Leak between valve body gaskets,.

6. Leak at servo center.

7.
Front pump clearances.
• Drive Range Overrun (Coast) Pressure

With the vehicle coasting in "Drive" range at 20-25

MPH with engine vacuum at approximately 20" Hg., low

servo apply (main line) pressure sttould be as shown on

the pressure check chart.

POWERGLIDE BASIC PRESSURE (MAINLINE) CHECK CHART

Engine

L-4 - 153 and

L-6 - 194

L-6 - 230

L-6 - 250

(Pass.)

L-6 - 250

(Taxi & Police)

V-8 - 283

V-8-327(2BBL Camaro)

V-8 - 327
&
427

V-8 - 396

V-8-327(W/RPO K-19)

V-8 - 350
Wide Open

Throttle

Upshift (psi)

93 - 104

96 - 112

91 - 105

96 - 112

90 - 105

91 - 107

104 - 119

104 - 119

99 - 113

91 - 106
Idle Pressure In

"Drive" Range

16"
Hg.

35-48

60 - 74

59 - 72

60 - 74

60 - 73

60 - 74

60 - 74

60 - 74

54 - 69

60 - 74
10"
Hg.*

60 - 71

88 - 101

84 - 95

88 - 101

86-98

88 - 101

88 - 101

88 - 101

83 - 95

88 - 101
Manual "Low"

Range
@
1000

RPM (psi)

105 - 118

124 - 139

105 - 118

124 - 139

115 - 128

124 - 139

124 - 139

124 - 139

109 - 124

124 - 139
Drive Range

Overrun (Coast)

@ 20 - 25 MPH

(20"
Hg.

Approx.) - psi

48 - 54

48 - 54

48 - 54

48 - 54

48 - 54

48 - 54

48 - 54

48 - 54

42 - 48

48 - 54

•Partially open throttle until vacuum reads 10" Hg.

CHEVROLET CHASSIS SERVICE MANUAL

CLUTCH AND TRANSMISSIONS 7-36

TURBO HYDRA-MATIC TRANSMISSION

INDEX

Page

General Description . . , . 7-36

Maintenance and Adjustments . 7-37

Transmission Fluid 7-37

Fluid Level Indicator 7-37

Shift Control Linkage Adjustment ........... 7-37

Neutral Safety Switch Adjustment 7-37

Draining and Refilling Transmission . . . 7-37

Pressure Regulator Valve 7-38

Control Valve Body . 7-39

Governor ..'.... 7-40

Modulator and Modulator Valve 7-40

Parking Linkage . . 7-40
Page

Rear Seal -. 7-40

Other Service Operations . . 7-40

Transmission Replacement 7-40

Turbo Hydra-Matic Diagnosis Procedure. ......... 7-41

Sequence . ; ; 7-41

Oil Level and Condition Check 7-41

Manual Linkage 7-41

Oil Leaks .' 7-41

Case Porosity - Repair ................ 7-42

Oil Pressure Check 7-42

Transmission Shift Points 7-42

Special Tools 7-43

GENERAL DESCRIPTION

The Turbo Hydra-Matic transmission is a fully auto-

matic unit consisting primarily of a 3-element hydraulic

torque converter and a compound planetary gear set.

Three multiple-disc clutches, one sprag unit, one roller

clutch and two bands provide the friction elements re-

quired to obtain the desired function of the compound

planetary gear set.

The torque converter couples the engine to the plane-

tary gears through oil and provides hydraulic torque

multiplication when required. The compound planetary

gear set produces three forward speeds and reverse.

The
3-
element torque converter consists of a pump or

driving member, a turbine or driven member, and a

stator assembly. The stator is mounted on a one-way

roller clutch which will allow the stator to turn clock-

wise but not counter-clockwise.

The torque converter housing is filled with oil and

is attached to the engine crankshaft by a flex plate and

always rotates at engine speed. The converter pump is

an integral part of the converter housing, therefore the

pump blades, rotating at engine speed, set the oil within

the converter into motion and direct it to the turbine,

causing the turbine to rotate.

As the oil passes through the turbine it is traveling in

such a direction that if it were not re-directed by the

stator it would hit the rear of the converter pump blades

and impede its pumping action. So at low turbine speeds,

the oil is re-directed by the stator to the converter pump

in such a manner that it actually assists the converter

pump to deliver power or multiply engine torque.

As turbine speed increases, the direction of the oil

leaving the turbine changes and flows against the rear

side of the stator vanes in a clockwise direction. Since

the stator is now impeding the smooth flow of oil, its

roller clutch releases and it revolves freely on its shaft.

Once the stator becomes inactive, there is no further

multiplication of engine torque within the converter. At

this point, the converter is merely acting as a fluid

coupling as both the converter pump and turbine are

being driven at approximately the same speed - or at a

one-to-one ratio.

A hydraulic system pressurized by a gear type pump

provides the working pressure required to operate the

friction elements and automatic controls.

External control connections to transmission are:
Manual Linkage

Engine Vacuum

12 Volt Electrical

Signal
To select the desired op-

erating range.

To operate a vacuum mod-

ulator unit.

To operate an electrical

detent solenoid.

A vacuum modulator is used to automatically sense

any change in the torque input to the transmission. The

vacuum, modulator transmits this signal to the pressure

regulator for line pressure control, to the 1-2 accumula-

tor valve, and to the shift valves so that all torque re-

quirements of the transmission are met and smooth

shifts are obtained at all throttle openings.

The detent solenoid is activated by an alectric switch

on the carburetor. When the throttle is fully opened, the

switch on the carburetor is closed, activating the detent

solenoid and. causing the transmission to downshift at

speeds below approximately 70 MPH.

The selector quadrant has six selector positions: P,R,

N,D,
L2,L1.

P.
*
- Park position positively locks the output shaft to

the transmission case by means of a locking pawl

to prevent the vehicle from rolling in either di-

rection. The engine may be started in Park

position.

R. - Reverse enables the vehicle to be operated in a

reverse direction.

N.
- Neutral position enables the engine to be started

and run without driving the vehicle.

D,
- Drive Range is used for all normal driving condi-

tions and maximum economy. Drive Range has

three gear ratios, from the starting ratio to

direct drive. Detent downshifts are available by

depressing the accelerator to the floor.

L2.
- L2 Range has the same starting ratio as Drive

Range, but prevents the transmission from shift-

ing above second speed to retain second speed

acceleration when extra performance is desired.

L2 Range can also be used for engine braking.

L2 Range can be selected at any vehicle speed,

and the transmission will shift to second gear and

remain in second until the vehicle speed or the

throttle are changed to obtain first gear operation

in the same manner as in D Range.

CHIVROLET CHASSIS SERVICE MANUAL