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General Motors 6T40 & 6T45
transversely mounted six speed automatic transmissions

Click here for 6T40 & 6T45
Transmission breakdown illustration

6T40, 6T45
Automatic Transmission Parts


Click here for important info on our Transmission Rebuild Kits
Transmission Rebuild kits Image Price    
144006 Master kit, 6T40 w / pistons
Includes: overhaul kit, friction clutch plates & standard steel plates
  $ 452.65  
144004 Banner kit, 6T40 08-UP w / pistons
Includes: overhaul kit, friction clutch plates
  $ 357.73  
144002 Overhaul Kit, 6T40, 6T45 2008-UP GM
Basic overhaul kit includes, paper gaskets, O rings, lip seals, metal clad seals and sealing rings.
  $ 252.78  
Filters Image Price    
A144010 FILTER, 6T40/45 08-UP
Aftermarket
$ 15.91  
Clutch Plates Image Price    
J144114 Friction, 6T40 LOW REV 08-UP

  $ 7.07  
J144108 Friction, 6T40 1-2-3-4 & 2-6 08-UP

  $ 8.2  
J144106 Friction, 6T40 3-5-REV 08-UP

  $ 7.64  
144100 Friction, 6T40/6F35 4-5-6 08-UP

  $ 3.43  
144124 Steel, 6T40 2-6 08-UP

  $ 14.13  
144126 Steel, 6T40 3-5-REV 08-UP

  $ 12.18  
144120 Steel, 6T40 4-5-6 08-UP (36T)

  $ 5.87  
144128 Steel, 6T40/6F35 1-2-3-4 08-UP

  $ 9.5  
144134 Steel, 6T40/6F35 LOW REV 08-UP

  $ 8.62  
144127 STEEL CUSHION, 6T40 3-5-REV CLU 08-UP
Not included in rebuild kit
  $ 44.95  
Pistons & Servos Image Price    
144962 PISTON, 6T40/45 2-6 CLU 08-UP (BONDED)

  $ 20.27  
144964 PISTON, 6T40/45/6F35 1-2-3-4 CLU 08-UP (BONDED)

  $ 20.44  
144966 PISTON, 6T40/45/6F35 3-5-REV CLU 08-UP (BONDED)

  $ 17.69  
144967 PISTON, 6T40/45/6F35 LOW REV CLU 08-UP (BONDED)

  $ 21.7  
144980 PISTON, 6T40/45 4-5-6 CLU BAL 08-UP (BONDED)

  $ 15.91  
Solenoids & Electrical Image Price    
D144420B SOL BODY, 6F35, W/SOLS, 09-UP

  $ 595.95  
D144436 SENSOR, 6T40 OUTPUT SPEED 08- UP

  $ 41.57  
D144438 SENSOR, 6T40 INPUT SPEED 08- UP

  $ 44.82  
Bushings Image Price    
144064K BUSHING/SEAL CASE (DRIVER'S SI DE ) 6T40/6F35

  $ 30.11  
T-144064 TOOL BUSING REMOVER INSTALLER CASE BUSHING 6T40/6F35
6F35 / 6T40 Axle Tool Kit (Superior K0100) Problem Solver Complaint: ATF leak from axle area on the driverÔ€™s side. This is usually due to a worn axle/case bushing and can result in seal failure, causing shifting complaints or slippage as is common with low fluid-level condition. Root Cause: Original bushing fails due to inadequate surface area, Babbitt material fatigues due mainly from stress and lack of lubrication to bushing surface and CV axle stub shaft. The Superior Correction: The durable SuperTuff Teflon coated bushing from Superior Transmission Parts Inc. virtually eliminates premature wear and the resulting leak at the axle seal. The new SuperTuff bushing is 23% wider than original to offer more support, Teflon coated for durability and engineered with a lube window that allows more oil in to provide better lubrication. Our New K0100 includes a high-quality, 3-piece tool set designed for quick removal of the worn bushing and an indexed re-installation of the SuperTuff bushing. The two-sided driver head allows the user to install an included seal made of better-than-OEM materials. Kit includes (5) axle seals and (5) SuperTuff Teflon bushings. Re-order Kit K099 for bushing and seal reloads ( one seal / one bushing per K099 ).
$ 477.62  
144064T BUSHING CASE (DRIVERS SIDE) TE FLON 6F35/6T40

  $ 18.89  
Sonnax Image Price    
144740-TL Tool Kit (Sonnax) GM 6T40
Reamer & Reamer Jig for Sonnax 144740-01
This tool kit can also be used to install the oversized solenoid regulator valve for the Ford 6F35 unit.
$ 53.08  
144740A-01 Oversized Solenoid Regulator Valve GM 6T40 (Sonnax)
Sonnax # 144740A-01 requires Sonnax tool kit 144740-TL to install
The Sonnax oversized solenoid regulator valve has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.
Click for Sonnax Information Sheet
$ 259.88  
Metal Clad Seals Image Price    
144070 SealL, 6T40 Converter 2008-UP

  $ 5.21  
144076 Seal, 6T40 Axle Right

  $ 7.5  
144077 Seal, 6T40 / 6F35 Axle Left

  $ 5.76  


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Makco Transmission Parts - 755 Grand Blvd, Ste. B105-261 Miramar Beach, FL 32550
Phone 1-877-916-2526    Fax 1-844-272-9944