6L45 6L90 ZIP IN D

2017-01-26

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Identification Guide

GM 6L45, 6L50, 6L80, 6L90
Valve Body Casting
Identification

Figure 1

Look for the machined-down boss on the
upper valve body (Figure 1). Generally, if the
“A” boss is machined down, this indicates an
MYA/6L45 unit (see chart below). This identification system is not foolproof, because
on some valve bodies none of the bosses are
machined down (Figure 2). Also see other
early vs. late and 6L45/6L50 vs. 6L80/6L90
application differences (Figure 3).
Machined-Down Boss
on Upper Valve Body

Indicates Valve
Body Unit*

“A” Boss ID

MYA/6L45

“B” Boss ID

MYB/6L50

“C” Boss ID

MYC/6L80

“D” Boss ID

MYD/6L90

Figure 2

MachinedDown Boss

Boss

EARLY Valve Body
(6L80 Shown)

Figure 3
6L80: Four holes offset to left.
6L90: Four holes offset to right.

*Note: This is a general rule to follow, but may not
always be true. Sometimes no bosses are machined.

Upper
Casting

Lower
Casting

Pre
2010

2010
2015

Center
Support
Feed
Holes

6L45

9405

7114

Centered

9581

0945

6L50

9405

7117

Centered

9581

0945

6L80

9404

0955

Offset
Front

9581

0945

0955

Offset
Rear

9581

6L90

9404

Pre
2010

2010
2015

0945

With exhaust ports are 2010-earlier,
use 24245720 separator plate.

LATE Valve Body
(6L50 Shown)

No exhaust ports are 2010–later.

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

ISS and OSS bosses short
on the 6L80 and 6L90.
6L45, 6L50: Four holes are
centered in machined area.

ISS and OSS bosses tall
on the 6L45 and 6L50.
6L45-6L90-Identify_D 01-24-17
Page 1

GM 6L45, 6L50, 6L80, 6L90 Identification Guide

Separator Plate Identification
Clutch Select Spring Usage
Refer to notes below in A and B, and Figure 4
to identify early 1st design plate that does not
use supplied clutch select springs.
	
	

Figure 4

A. Early, 1st Design Plate
(OE 24246916)

ID Notches

NOTE: All other plate designs can use
supplied springs.

A. I f Early, 1st design plate 24246916 is
equipped, REPLACE with Early, 2nd
design plate 24245720 and install Sonnax
clutch select valve spring kit 104740-02K.



B. W
 hen using Early, 2nd design plate
(2010-Earlier, OE part #24245720):
DO NOT install checkball #8.
#8 Checkball Usage
Reference Figure 4 images C and D for orifice
location and size in determining if #8 checkball
is used.

B. Early, 2nd Design Plate
(OE 24245720)

ID Notches

See Figure 5 for location of #8 checkball when
necessary.
NOTE: OE separator plate part numbers correct
at time of printing. Recommend confirming part
numbers with dealer as part supersession is
common.

C. No #8 Checkball

Figure 5

.175"
Orifice:
Do not
install #8
checkball

D. Requires #8 Checkball

#8
Checkball
Location,
If Required

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

.054"
Orifice:
Install #8
Checkball

6L45-6L90-Identify_D 01-24-17
Page 2

GM 6L45, 6L50, 6L80, 6L90
ZIP KIT
PART NUMBER 6L45-6L90-ZIP

QUICK GUIDE

Parts are labeled here in order of installation. See other side of sheet for details on Zip Kit contents.

installation Diagram
Cup plug
bore

3

1a

1

1b

2
	NOTE:
Pump must be
removed to install
Sonnax pressure
regulator valve.

Balance
port

Pump
Cover

Drop one Sonnax 1/8"
aluminum checkball into
OE orificed cup plug.
Drive checkball into cup
plug with appropriately
sized punch. Stake cup
plug to prevent checkball
displacement.

Using included Sonnax
drill bit, bore a new orifice
from the cup plug bore
to inboard balance port
at an approximate 45°
angle. Starting drill bit
on countersunk surface
of cup plug bore works
best. Clean bore thoroughly, removing all
debris and chips.

4
Upper
Valve Body

5

9

Plastic Checkballs

CAUTION! Checkball #8 is only
used with 24272467 (Late, 2nd
design) separator plates. See
CAUTION
figure four & five on page 2 of
separate Identification Guide for info.

8

10

Center Support Seals

CAUTION! See pages
2 & 3 of installation
and testing booklet
CAUTION
for details.

6

CAUTION

Lower
Valve Body

8
6

CAUTION

CAUTION

7
In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum
testing and additional repair options for higher mileage units or for repairing specific complaints which are beyond the
scope of this kit.
©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45-6L90-Zip-Guide_D 01-24-17
Page 1

GM 6L45, 6L50, 6L80, 6L90 ZIP KIT

Quick Guide

Zip Kit Contents & Installation Steps
Step	

1

 eroute Pressure Regulator
R
Valve Balance Feed

NOTE: Pump must be removed to install Sonnax pressure regulator valve.
Remove all components from bore prior to proceeding. Following steps
required for use of Sonnax valve.
	 Drop one Sonnax 1/8" aluminum checkball into OE orificed cup plug.
1a Drive checkball into cup plug with appropriately sized punch. Stake cup
plug to prevent checkball displacement.
	 Using included Sonnax drill bit, bore a new orifice from the cup plug
1b bore to inboard balance port at an approximate 45° angle. Starting drill
bit on countersunk surface of cup plug bore works best. Clean bore
thoroughly, removing all debris and chips.

Packaging Pocket 1

•	Drill Bit, .039" dia.

• Checkball, 1/8" (2) 1 Extra

Step	 2 Replace OE Pressure
Regulator Valve

Step	 6 R
 eplace Clutch Select
Valve #2 & #3 Springs
& End Plugs
	

Sonnax clutch select valve springs can be used with all OE separator
plates EXCEPT separator plate 24246916 (Early, 1st design). If separator plate 24246916 is equipped, it must be upgraded with OE plate
24245720 (Early, 2nd design) to prevent code P0751, shift concerns and
burnt/slipping 1-2-3-4 and/or 3-5-Reverse clutches. See Figures 3 and 4 on
separate Identification Guide for information.
CAUTION

Packaging Pocket 6

•	Springs (2)

• End Plugs (2)

Step	 7 R
 eplace Compensator
Feed Regulator Valve
Sleeve installs with end grooves inboard. Valve installs with spring
pocket outboard.

Re-use OE springs.

Packaging Pocket 7

Packaging Pocket 2

•	Valve

Pressure Regulator Valve

Step	 3 Replace OE Boost
Assembly
Packaging Pocket 3

•	Boost Valve

• Boost Sleeve

• O-Rings (3) 1 extra

• Sleeve

• Spring

Step	 8 R
 eplace TCC Regulator
Valve Lineup
	
CAUTION

 locking/Rotational alignment of components are critical. See
C
page 2 of installation and testing booklet for details.

Packaging Pocket 8

•	Spring • TCC Regulator Valve • Shuttle Valve • End Plug

Step	 4 Replace Upper Valve Body
OE End Plugs

Step	 9 Replace OE Checkballs

Place O-ring in groove, lubricate with Sonnax Slippery Stick™ O-LUBE
and roll on bench to size.

Checkballs, .250" dia. (8)

Packaging Pocket 4

NOTE: Not all checkballs used on all castings. See warning on page 1
of this Quick Guide.

•	End Plugs (4)

Packaging Pocket 9

• O-Rings (6) 2 extra

Step	 5 Replace OE Actuator Feed
Limit Valve
Sleeve installs with end grooves inboard. Valve installs with spring stem
outboard.

Step	 10 Install Center Support Seals
	 CAUTION See pages 2 & 3 of installation and testing booklet for details.
Packaging Pocket 10

•	Seal Inserts (8)

• Springs (6)

Packaging Pocket 5

•	Valve • Sleeve • Spring

Step	 11 Vacuum Testing
Use nut for testing pump body pressure regulator valve. Block valve
outboard as shown on page 5 of installation and testing booklet.
Remove nut after testing.
Packaging Pocket 11

•	Nut, .125"
©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45-6L90-Zip-Guide_D 01-24-17
Page 2

GM 6L45, 6L50, 6L80, 6L90
ZIP KIT
PART NUMBER 6L45-6L90-ZIP

	

CAUTION

Cautions

INSTALLATION & TESTING BOOKLET
Figure 1

Figure 2

Control Solenoid Valve Assembly
Use care when handling the control solenoid valve
assembly (valve body and TCM or TEHCM). If
dropped, roughly handled, or exposed to excessive
dust and debris, damage could occur to the TEHCM.
A thorough inspection and cleaning of the TEHCM
should be included in any rebuild procedure, and is
detailed on page 3.

Torx Plus® Bolt

The control solenoid valve assembly must be removed
prior to removing the converter housing and pump assembly. Severe component damage will result if not followed.

Figure 3
Figure 4

Fast Learn Adapts
 ollowing installation of the Zip Kit, the Service Fast
F
Learn Adapts procedure must be performed. Follow
instruction on the scan tool or reference OE specifications for details on the procedure.
GM Tool DT-48285

Zip Kit Instructions

Input/Output Speed
Sensor Assembly

1. R
 emove & Disassemble the
Control Solenoid Valve Assembly

Position Switch Connector

a. Remove six control solenoid valve assembly-tocase Torx Plus® bolts (Figure 1 & 2). A special
socket (GM Tool Part No. DT-48285) is available (Figure 3), or a standard 11/32" six-point drive
socket will work with care.
b. Remove two bolts (8mm head) and input/
output speed sensor assembly (Figure 4).
c. Remove the single 8mm head bolt and manual
shaft detent assembly. Release the position switch
assembly connector, remove the single 10mm
head bolt, then remove the position switch assembly (Figure 5).

Manual Shaft Detent Assembly

d. Remove the two 8mm head bolts on the side of
the TEHCM (Figure 6).

Figure 5

Bolt Color
Code

Bolt
Length

Bolt
Head

Yellow

36mm

7mm

Orange

73mm

TorxPlus

Red

45mm

7mm

Green

55mm

10mm

Blue

53mm

8mm

Purple*

20mm

8mm

Pink*

14.5mm

8mm

Note: Torque all bolts at 71 in-lb,
except (*) pink & purple should be
torqued at 106 in-lb.

Figure 6

e. Remove the four 10mm head and five 7mm head
bolts (Figure 7). Remove the TECHM and set
aside for inspection, testing and cleaning.
f. Remove the 12, 7mm head bolts (Figure 8).
g. 
Remove the five 7mm head bolts and single
10mm head bolt. The valve body halves may now
be separated from each other (Figure 9).
©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45-6L90-Zip-Booklet_D 01-24-17
Page 1

6L45, 6L50, 6L80, 6L90 ZIP KIT

TIME TESTED • INDUSTRY TRUSTED

Figure 7

Installation & Testing Booklet

Zip Kit Instructions (continued)
2. Pump Disassembly & Assembly
Remove 13 pump-cover-assembly-to-torque-converter-housing bolts. For reassembly, torque bolts in the sequence shown to 97 in-lb (Figure 10).

3. Installation
Install Zip Kit parts as shown on diagram of separate quick guide sheet included in
this Zip Kit. Sonnax recommends vacuum testing critical wear areas not covered by
this kit to determine whether additional Sonnax parts are required (see pages 5–6).

Zip Kit Quick Guide Details
Figure 8
12

4

6

8

2
1

10

1. Replace TCC Regulator Valve Lineup
Clocking/rotational alignment of components from step 8 is critical, see diagram for
proper alignment (Figure 11).
Figure 11

Critical TCC Regulator Valve
Line-up Clocking/Rotational
Alignment
11

9

7

Retainer slot
holds plug boss
VERTICAL.

5

3

Figure 9
TS
FLA

e
Fac

ard

Upw

2. Center Support Seal Reinforcement Insert Installation

Figure 10

b. Remove OE center support seal assembly from case and set aside for reuse
(Figure 13).

1

5

6

13

10

9

2
4

7

12
8

a. Install four Sonnax valve body seal inserts (non-grooved, non-threaded) into
the back side of valve body. Use appropriately sized flat punch to lightly tap
inserts into place. Shoulder on insert will seat flush against the finished valve
body surface (Figure 12).

3

11

c. Install four Sonnax case seal inserts (grooved and threaded) into the case at
the center support location (Figure 14). Use appropriately sized flat punch to
lightly tap inserts into place. Shoulder on insert will seat flush.
	
TECH TIP: Threads are provided for removal of case inserts when necessary to
	 TECH allow center support removal.
TIP!

d. Reinstall OE center support seals over Sonnax case seal inserts.
	NOTE: 6L45 and 6L50 center support seals are approximately .900” tall (outer)
and .730” tall (inner). 6L80 and 6L90 unit seals are shorter, approximately .590” tall
(outer) and .420” tall (inner) (Figure 15).

01-24-17 6L45-6L90-Zip-Booklet_D
Page 2

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45, 6L50, 6L80, 6L90 ZIP KIT

Installation & Testing Booklet

TIME TESTED • INDUSTRY TRUSTED

e. Install appropriate Sonnax springs into OE seals
as described below, then secure springs by trapping them in seals with assembly lube (Figure 16).

Figure 12

For 6L45/6L50 seals:
• Insert tall (.560") Sonnax springs
in tall outer seals.
• Insert medium (.380") Sonnax springs
in shorter middle seals.
For 6L80/6L90 seals:
• Insert short (.250") Sonnax springs
in tall outer seals.
• NO springs required in shorter middle seals.
Figure 13

f. After reassembling TEHCM to valve body (Step 5
below), install valve body into case. Ensure the four
Sonnax valve body inserts slide into the OE center
support seals before installing valve body fasteners.

3. TEHCM Inspection & Cleaning
The TEHCM is continually immersed in transmission
oil and exposed to debris generated during transmission operation. This debris can create malfunction of
the TEHCM and its components if not cleaned thoroughly. Clean with shop air, but do not use a rag or
cloth, as lint will contaminate the TEHCM (Figure 17).
a. 
Remove and replace filter plate assembly
(Figure 18). This part must be replaced any time
the control solenoid valve assembly had been
removed, as the seals take a set.

Remove OE seal assembly, save for reuse.
Figure 16

Figure 14

b. Debris can easily collect in the solenoid cavities,
supply and control ports. Examine these locations carefully and apply 30 psi regulated shop
air to remove debris. Also check the 16-way
connector, TFT sensor and ISS/OSS connector
for debris (Figure 19).
c. Inspect the 16 solenoid electrical contact leads
and IMS connector for debris and clean if necessary (Figure 20).
d. If problems are found with pressure switch seals
or laminate discs, Sonnax offers pressure switch
rebuild kits, available separately (Figure 21).

4. TEHCM Testing
The TEHCM can be tested, although this requires
special tools and the vehicle for communication with
the data bus. Reference “Bench Testing the 6L506L80-6L90-6T70-6T75 TEHCM” by Steve Garrett
in August 2012 Gears or OE specifications for details.

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

After installing appropriate springs,
secure springs in seals with a dab of
assembly lube over seal opening.
6L45/6L50
Outer Seals: .900" Tall
Inner Seals: .730" Tall

Outer Seal

Inner Seal

6L80/6L90
Outer Seals: .590" Tall
Inner Seals: .420" Tall

Inner Seal

Figure 15

Outer Seal

6L45-6L90-Zip-Booklet_D 01-24-17
Page 3

TIME TESTED • INDUSTRY TRUSTED

6L45, 6L50, 6L80, 6L90 ZIP KIT

Installation & Testing Booklet

5. R
 eassemble Control Solenoid Valve Assembly

Figure 17

It is important to follow the assembly and torque sequence as well as torque ratings indicated in the bolt chart to ensure proper function of the control solenoid valve assembly.
a. Install the 12, 7mm head bolts and torque to 71 in-lbs. in sequence shown
(Fig. 8).

TEHCM

b. Place the TEHCM on the valve body. Install the two 8mm head bolts and
hand-tighten only (Figure 6).
c. Install the four 10mm head and five 7mm head bolts and hand-tighten only
(Fig. 7).

Figure 18

d. Reconnect the position switch connector and align the switch activator slide
with the manual valve link as shown. Secure the assembly to the casting with
the 10mm head bolt and hand-tighten only (Figure 5 & 22).
e. Install the five 7mm head bolts and single 10mm head bolt and hand-tighten
only (Figure 23).

ISS/OSS Connector

Figure 19

f. Tighten all 18 bolts in the sequence indicated to 71 in-lbs. Bolts 17 and 18 are
on the side of the TEHCM (Figure 24).

16-Way
Connector

g. Inspect the contact area between the aluminum portion of the TEHCM and
the valve body casting. There should be no visible gap. If a gap is found, loosen
all 18 bolts in step “f ” and re-torque until no gap exists (Figure 25).
h. Reconnect the input/output speed sensor connector and torque the two
bolts to 106 in-lbs (Figure 4).

Check all
solenoid
cavities.
Check all
supply
& control
parts.

TFT
Sensor

i. R
 einstall the manual shaft detent assembly and torque the bolt to 106 in-lbs
(Figure 5).

Figure 21

Figure 20

IMS
Connector

Solenoid Leads

Sonnax pressure switch rebuild kits:
124740-28K, 124740-30K & 124740-TL30

Figure 22

Figure 23

Align

17

1

2
14

4

8
10

01-24-17 6L45-6L90-Zip-Booklet_D
Page 4

Figure 24

18

7
6

3
5

9
No Gap
12

11

Figure 25

13

15

16

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45, 6L50, 6L80, 6L90 ZIP KIT

Installation & Testing Booklet

TIME TESTED • INDUSTRY TRUSTED

Critical Wear Areas & Vacuum Test Locations

20

NOTE: OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations are pointed
to with an arrow. Springs are not shown for visual clarity. Low vacuum reading indicates wear and Sonnax parts noted for replacement.
For specific vacuum test information, refer to individual part instructions included in kits and available at www.sonnax.com.

Pump Body • 6L80 Shown Here

15

10

25

5

0
30
VACUUM
TEST

TCC Control Valve

Converter Feed Limit Valve

•	No lockup
•	Falling out of lockup hot
•	Lockup codes
NOTE: Test at valve port while
plugging side port with thumb.

•	Converter failure
•	Converter codes
•	Excessive converter pressure
NOTE: Must test with actuator feed limit (AFL)
valve instead of converter limit valve. Position
AFL valve so spool face and port face are flush as
indicated.
Replace with Sonnax Part No.
104520-11 Requires F-104520-TL11C & VB-FIX

Test Here
Plug Here

Remove Converter
Limit Valve

Flush

Test using AFL
Valve (#209)

Pressure Regulator Valve

Boost Assembly

•	Low/High line pressure
Block with
.125" nut
•	Soft/Harsh shifts
•	Converter burn-up • Clutch failure

•	Insufficient line rise
•	Clutch failures • Poor shift quality
NOTE: Test both ports simultaneously.

NOTE: Block outboard as shown with .125" thick nut.
Replace with Sonnax Part No.
104520-03K*
104520-07K Requires F-104520-TL7C, VB-FIX, VB-06

Clutch Select Valve #3
Shift complaints

Replace with Sonnax Part No.
104520-01K*

Lower Valve Body
6L80 Shown Here

TCC Regulator Apply Valve
•	No TCC/Slip or soft apply
•	Harsh TCC apply • Converter codes
NOTE: Test with .125" thick nut between shuttle
valve and regulator valve.





Replace with Sonnax Part No.
104740-07K Requires F-104740-TL7 & VB-FIX

NOTE:
 Key
on pg 6

Clutch Select Valve #2
Shift complaints

Compensater Feed Valve
•	Burnt clutches • Shift complaints
Replace with Sonnax Part No.
104740-09K*

*Part numbers with an asterisk (*) are included in this Zip Kit.
©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45-6L90-Zip-Booklet_D 01-24-17
Page 5

TIME TESTED • INDUSTRY TRUSTED

6L45, 6L50, 6L80, 6L90 ZIP KIT

Installation & Testing Booklet

Critical Wear Areas & Vacuum Test Locations
NOTE: OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations are pointed to with an arrow.
Springs are not shown for visual clarity. Low vacuum reading indicates wear and Sonnax parts noted for replacement.

Upper Valve Body • 6L80 Shown Here

1234 Clutch Boost Valve
•	Burned 1234 Clutch
•	Shift complaints in 1st, 2nd, 3rd & 4th gear
Replace with Sonnax Part No.
104740-01 Requires F-104740-TL & VB-FIX

1234 Clutch Regulator
& Shuttle Valve
•	Burned 1234 Clutch
•	Shift complaints in 1st, 2nd, 3rd &
4th gear

End Plugs
•	Burnt clutches/brakes
•	Various shift complaints
NOTE: Test end plugs at port between
valve and end plug.



Replace with Sonnax Part No.
104740-23K*
NOTE: Several Locations =

2-6 Clutch Regulator
& Gain Valves



•	Burned 3-5 Reverse Clutch
•	Delayed/No reverse
•	3rd & 5th Shift Complaints

3-5 Clutch
Boost Valve
•	Burned 3-5 reverse clutch
•	Delayed/No reverse
•	Shift complaints in 3rd
& 5th gear
Replace with Sonnax
Part No. 104740-01
Requires F-104740-TL & VB-FIX



•	Burned 2-6 clutch
•	Shift complaints in 2nd & 6th gear

3-5 Reverse Clutch
Regulator Valve









456 Clutch
Boost Valve





Insets shown with end plugs removed for
clarity only. Test with end plugs installed.

•	Burned 456 clutch
•	Shift complaints in 4th,
5th & 6th gear
Replace with Sonnax
Part No. 104740-01
Requires F-104740-TL & VB-FIX

CBR1/C456 Clutch
Regulator Valve
•	Burned 456 clutch
•	Shift complaints in 4th, 5th
& 6th gear

Actuator Feed Limit Valve
•	Harsh shifts
•	Solenoid codes
•	No/Slipping shifts
Replace with Sonnax Part No.
104740-12 Requires F-104740-TL12 & VB-FIX

*Part numbers with an asterisk (*) are included in this Zip Kit.
01-24-17 6L45-6L90-Zip-Booklet_D
Page 6

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

6L45, 6L50, 6L80, 6L90 ZIP KIT

Installation & Testing Booklet

TIME TESTED • INDUSTRY TRUSTED

OE Exploded View
Pump & Lower Valve Body • 6L80 Shown Here
302
303

104
301

102

103

Pump Body Descriptions

I.D. No.

Description

101

Pressure Regulator Valve &
Boost Assembly

102

Converter Feed Limit Valve

103

Pressure Relief Ball & Spring

104

TCC Control Valve

101

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

Lower Valve Body Descriptions

304

305

I.D. No.

Description

301

Manual Valve

302

TCC Regulator
Apply Valve

303

Compensator Feed Valve

304

Clutch Select Valve #3

305

Clutch Select Valve #2

6L45-6L90-Zip-Booklet_D 01-24-17
Page 7

6L45, 6L50, 6L80, 6L90 ZIP KIT

TIME TESTED • INDUSTRY TRUSTED

Installation & Testing Booklet

OE Exploded View
Upper Valve Body • 6L80 Shown Here
201
Upper Valve Body Descriptions

I.D. No.

202

Description

201

1234 Clutch Boost Valve

202

1234 Clutch Regulator
& Shuttle Valve

203

3-5 Reverse Clutch
Regulator Valve

204

3-5 Reverse Clutch Boost Valve

205

2-6 Clutch Regulator
& Gain Valves

206

Exhaust Backfill
Pressure Relief Valve

207

456 Clutch Boost Valve

208

CBR1/C456 Clutch
Regulator Valve

209

Actuator Feed Limit Valve

203

204

205

CAUTION

CAUTION! Do Not Remove!
The plug is set at a precise
depth at the factory.

206
207

CAUTION! Checkball #8 is only used
with 24272467 (Late, 2nd design)
CAUTION
separator plates. See separate
Identification Guide for info.

208

GM 6L45-6L90 Clutch & Solenoid Application Chart
Gear Range
Park
Reverse

1-2-3-4
2-6
3-5 Rev.
Low Rev.
Shift Shift
CL PC
CL PC
CL PC 4-5-6 CL PC 1-2-3-4 3-5 Rev. 4-5-6
Sol 1 Sol 2 Sol 5 N.L. Sol 4 N.L. Sol 2 N.H. Sol 3 N.H. Clutch Clutch Clutch
ON
ON
OFF
OFF
OFF
ON
ON

OFF

OFF

OFF

ON

ON

2-6
Clutch

Applied

Neutral

ON

ON

OFF

OFF

OFF

ON

D-1st Braking

ON

ON

ON

OFF

OFF

ON

Applied

D-1st

OFF

ON

ON

OFF

OFF

OFF

Applied

D-2nd

OFF

ON

ON

ON

OFF

OFF

Applied

D-3rd

OFF

ON

ON

OFF

ON

OFF

Applied

D-4th

OFF

ON

ON

OFF

OFF

ON

Applied

D-5th

OFF

ON

OFF

OFF

ON

ON

D-6th

OFF

ON

OFF

ON

OFF

ON

Low &
Rev.
Clutch
Applied*

Low
Clutch
Sprag

Applied
Applied*
Applied

Holding

209

Holding
Applied
Applied
Applied
Applied

Applied
Applied

Applied

Notes:
For shift solenoids 1 and 2, “ON” = Solenoid Energized (Pressurized), “OFF” = Solenoid De-energized (No Pressure).
For pressure control (PC) solenoids, “ON” = Pressurized, “OFF” = No Pressure.
* = Applied with No Load.

01-24-17 6L45-6L90-Zip-Booklet_D
Page 8

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com



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