GM 6T30/40/45/50 (Gen. 2), 6T40 (Gen. 3) Valve Body Layout

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. Each layout:

• Displays an exploded view location guide for individual valve trains
• Identifies symptoms and recommended solutions for quality rebuilds
• Provides active links to view specific part details
• Lists any tools/fixtures required for part installation
• Illustrates correct part orientation

With more than 60 layouts to choose from, these convenient, go-to reference guides are valuable resources for any shop.

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Related Units

Related Parts

Required

Recommended

6T30 (Gen. 1), 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 1), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

Oversized Actuator Feed Limit Valve 144740-01

Helps cure:

• No 4th
• No 5th
• No 6th
• Low clutch oil pressure
• Harsh shifts
• Flare shifts

Required

Recommended

6T30 (Gen. 1), 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 1), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

Oversized TCC Regulator Valve Kit 144740-16K

Helps cure:

• Code P0741, P0742
• No lockup
• TCC slip
• Loss of fuel economy
• Low TCC apply pressure
• Overheated fluid & TCC lining
• Harsh TCC apply

Required

Recommended

6T30 (Gen. 1), 6T30 (Gen. 2), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2)

Oversized TCC Control Valve Kit 144510-05K

Helps cure:

• Excess TCC slip
• Low cooler flow
• Overheating
• Low converter & lube flow
• TCC apply & release concerns
• TCC codes
• TCC lining failure

Required

Recommended

6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

Zip Kit® 6T40-GEN2-3-ZIP

Helps cure:

• Burnt clutches
• Line pressure instability
• Loss of fuel economy
• No line rise
• Pressure loss
• Shift concerns
• TCC apply & release concerns
• TCC codes

Required

Recommended

6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

O-Ringed End Plug Kit 144510-14K

Helps cure:

• Pressure loss
• Burnt clutches
• Shift concerns
• TCC apply concerns

Required

Recommended

6T30 (Gen. 1), 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 1), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

Actuator Feed Limit Valve Kit 144740-39K

Helps cure:

• No 4th
• No 5th
• No 6th
• Low clutch oil pressure
• Harsh shifts
• Flare shifts

Required

Recommended

6T30 (Gen. 1), 6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 1), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

TCC Regulator Valve Kit 144740-38K

Helps cure:

• Code P0741, P0742
• No lockup
• TCC slip
• Loss of fuel economy
• Low TCC apply pressure
• Overheated fluid & TCC lining
• Harsh TCC apply

Required

Recommended

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40)

Pressure Regulator Valve Kit 144510-17K

Helps cure:

• Burnt clutches
• Low line pressure
• Line pressure instability
• Shift concerns

Required

Recommended

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40)

Pressure Regulator Isolator Valve Kit 144510-15K

Helps cure:

• Low line pressure
• Line pressure instability
• Shift concerns
• Burnt clutches

Required

Recommended

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40)

Lube On Demand Valve Kit 144510-19K

Helps cure:

• Low cooler flow
• No converter apply
• Low line pressure
• Overheated converter
• Overheated fluid

Required

Recommended

6T30 (Gen. 2), 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T40 (Gen. 2), 6T41 (Gen. 3 6T40), 6T45 (Gen. 2), 6T46 (Gen. 3 6T40), 6T50 (Gen. 2), 6T51 (Gen. 3 6T40)

Signal Accumulator Piston Kit 144740-40K

Helps cure:

• Shift concerns associated with circuit pressure loss
• Burnt clutches
• Soft shifts

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