6T70 Gen2 VTG

: Sonnax 6T70-Gen2 Vtg 6T70-Gen2_VTG 661 file tech_resource uploads

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TCC Regulator

Apply Valve

• Code P0741, 742 • TCC slip

• Harsh TCC apply

• Loss of fuel economy

• Low TCC apply pressure

• Overheated uid & TCC lining

Replace with Sonnax Part No.

124740-24K

Requires F-124740-TL24 & VB-FIX

Isolator Valve

• Low line pressure

• Line pressure instability

• No line rise • Burnt clutches

• Harsh shifts • Shift concerns

Replace with Sonnax Part Nos.

124740-16 (Spring Only)

124740-03K (Isolator Valve Kit)

Clutch Select

Solenoid Valve #3

• Various shift concerns

• Shift codes

Pressure Regulator Valve

• High/Low line pressure

• Slipping/Burnt clutches

• Harsh/Soft shifts/apply

• Transmission overheat

• Low/No cooler/lube ow











O-Ringed End Plugs

• Pressure loss • Shift concerns

• Burnt clutches • TCC apply concerns

NOTE: Vacuum test end plugs at outboard port while sealing

bore opening with thumb.

Replace with Sonnax Part No. 124740-02K

NOTE: Several Locations =

3-5 Reverse Clutch Regulator Valve

• Burnt 3-5 Reverse clutch

• Delayed Reverse

• 3rd & 5th Shift concerns

• 2-3, 4-5 Flare

2-6 Clutch Regulator

& Gain Valve

• Burnt 2-6 clutch

• 2nd & 6th Shift concerns

• 1-2, 5-6 Flare

Clutch Select

Solenoid Valve #2

• Various shift concerns

• Shift codes

Test

Together



TCC Control Valve

• Excess TCC slip • Overheating

• Low cooler ow • TCC apply codes

• TCC apply & release concerns

• Low converter & lube ow

• TCC lining failure

Replace with Sonnax Part No.

124740-14K

Requires F-124740-TL14 & VB-FIX

Test

Together

Test

Together

L/R Overdrive Clutch

Regulator Valve

• Burnt L/R and/or 4-5-6 clutch

• 4-5-6 Shift concerns

• Delayed Reverse

• 3-4 Flare

Test

Together

Upper Valve Body • 6T70 (Gen. 2) Shown

Click on Sonnax part numbers

to see more information.

©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company 6T70 Vac Test Guide 08-09-18

866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com Page 1

GM Gen. 2 6T70, 6T75, 6T80

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.

20

25

15

0

10

5

30

VACUUM

TEST

Lower Valve Body • 6T70 (Gen. 2) Shown

Plug port

on back.

4-5-6 Clutch Boost Valve

• Burnt 4-5-6 clutch

• 4-5-6 Shift concerns

• 3-4 Flare

Plug port

on back. 1-2-3-4 Clutch

Boost Valve

• Burnt 1-2-3-4 clutch

• Delayed Forward

• 1-2-3-4 Shift concerns

Plug port

on back.

1-2-3-4 Clutch

Regulator Valve

• Burnt 1-2-3-4 clutch

• Delayed Forward

• 1-2-3-4 Shift concerns

4-5-6 Clutch

Accumulator Piston

• Harsh 3-4

• 3-4 Flare

• Burnt 4-5-6 clutch

3-4 Reverse Clutch

Boost Valve

• Burnt 3-5 Reverse clutch

• Delayed Reverse

• 3rd & 5th Shift concerns

• 2-3, 4-5 Flare

Plug port

on back.

Plug port

on back.

Actuator Feed

Limit Valve

• Harsh shifts • Low clutch pressure

• No/Slipping shifts • Solenoid codes

Click on Sonnax part numbers

to see more information.

©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company 6T70 Vac Test Guide 08-09-18

866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com Page 2

GM Gen. 2 6T70, 6T75, 6T80

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.

20

25

15

0

10

5

30

VACUUM

TEST

110 101

109

102

108

107

106

105

104

103

6T70 (Gen. 2) Upper Valve Body Descriptions

I.D. No. Description

101 Pressure Regulator Valve

102 Isolator Valve

103 TCC Control Valve

104 Clutch Select Solenoid Valve #3

105 Clutch Select Solenoid Valve #2

106 Manual Valve

107 L/R 4-5-6 Clutch Regulator Valve

108 TCC Regulator Apply Valve

109 2-6 Clutch Regulator & Gain Valve

110 3-5 Reverse Clutch Regulator Valve

OE Exploded View

Upper Valve Body • 6T70 (Gen. 2) Shown

NOTE: Depending upon vehicle application, the OE springs shown may not be present.

©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company 6T70 Vac Test Guide 08-09-18

866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com Page 3

GM Gen. 2 6T70, 6T75, 6T80

201

202

205

204

6T70 (Gen. 2) Lower Valve Body Descriptions

I.D. No. Description

201 4-5-6 Clutch Accumulator Piston

202 1-2-3-4 Clutch Boost Valve

203 1-2-3-4 Clutch Regulator Valve

204 4-5-6 Clutch Boost Valve

205 Actuator Feed Limit Valve

206 3-5 Reverse Clutch Boost Valve

206

203

OE Exploded View

Lower Valve Body • 6T70 (Gen. 2) Shown

NOTE: Depending upon vehicle application, the OE springs shown may not be present.

©2018 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company 6T70 Vac Test Guide 08-09-18

866-243-8829 • 856-848-0908 • F: 856-848-1080 • www.sonnax.com Page 4

GM Gen. 2 6T70, 6T75, 6T80