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Earl's Oil Cooler Transmission Adapter

Fits GM 6L80, 6L90, and 8L90E Transmissions, -6 AN Male Flares, Black Anodized Finish


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Earl's Transmission oil cooler adapter allows easy installation of AN -6 hoses & oil cooler on late model GM 6 & 8-speed automatic transmissions (fits 6L80, 6L90, and 8L90E transmissions). This adapter replaces the factory thermostat. These adapters use O-Ring seals and have -6 AN male flares for use with AN pluming & Earl's oil coolers. Black Anodized finish.


  • Billet Aluminum Construction w/ Black Anodized Finish
  • -6 AN Male Flares – Use w/ AN Plumbing
  • Bolts to Transmission & Features O-Ring Seals
  • Ideal for Use w/ Earl’s AN Plumbing & Oil Coolers
  • Low Profile – For Extra Tunnel Clearance & Easier Routing of Hoses


Adapter AN Size ( A )6 AN MALE
Adapter AN Size ( B )6 AN MALE
Adapter TypeTransmission Cooler
Emission Code5
FinishAnodized Black
Material6061 Aluminum
Product TypeTransmission Cooler
Part Number1128ERL



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

On 6L80 & 6L90 Transmissions the Top Port is the Outlet & Bottom Port is the Return. On 8L90E Transmissions the Front Port is the Outlet & the Rear Port is the Return. This adapter can also be used on the GM 8L45E transmission, but you will need a slightly shorter mounting bolt (about 3/16" shorter).
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        Some parts are not legal for use in California or other states with similar regulations.

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