Tech Resources Transmission Remanufactured Valve Bodies Article GM Identification Guides
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September 18, 2014
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GM Gen. 1, 2 & 3 6T30, 6T40, 6T45, 6T50 Series Identification Guide


Generation 1

Generation 2

Generation 3

Front Pump

Generation 1

Generation 2

Generation 3

View of Pressure Regulator Valve in Pump Port

Generation 1

Generation 2 & 3

Main Valve Body, Lower Side

Generation 1

Generation 2 & 3

Valve Body, Upper Cover

Generation 1

Generation 2 & 3

GM 6T40 Gen. 1 Channel CastingGM 6T40 Gen. 2 & 3 Channel Casting​​​​​​​
Note channel casting worm track variations between Gen. 1 and Gen. 2 & 3.
Gen. 2 & 3 include pockets for 5 signal accumulator pistons.

Generation 1

Generation 2 & 3

6T40 Series Filter Plates
TEHCM, Lower Side

Generation 1

Generation 2

TEHCM, Upper Side

Generation 1

Generation 2 & 3

TEHCM ID Plate
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Related Units

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


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

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), 6T40 (Gen. 1), 6T45 (Gen. 1), 6T50 (Gen. 1) Zip Kit® 6T40-ZIP

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

Zip Kit® 6T40-ZIP

    Helps cure:
  • Burnt clutches
  • Line pressure instability
  • Loss of fuel economy
  • No line rise
  • Pressure loss
  • Pressure switch codes
  • 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) Zip Kit® 6T40-GEN2-3-ZIP

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. 1), 6T40 (Gen. 1), 6T45 (Gen. 1), 6T50 (Gen. 1) Remanufactured Valve Body GM6T40-1

6T30 (Gen. 1), 6T40 (Gen. 1), 6T45 (Gen. 1), 6T50 (Gen. 1)
Remanufactured Valve Body GM6T40-1

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) Remanufactured Valve Body GM6T40-2-3

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)
Remanufactured Valve Body GM6T40-2-3

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