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Earl's Transmission Adapter

Fits GM (General Motors) 6L80, and 6L90 Transmissions, -6 AN Male Flares, Black Anodized Finish, Fits Transmissions w/ OE (original equipment) Thermostat (Bolts onto the OE Thermostat).


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Earl's Transmission oil cooler adapters allow easy installation of AN -6 hoses to a late-model GM 6-speed automatic transmissions (fits 6L80 and 6L90 transmissions). This adapter bolts onto the Original Equipment transmission thermostat. This adapter uses O-Ring seals and has -6 AN male flares for use with AN pluming & Earl's (or similar) oil coolers. Black Anodized finish.


  • Oil Cooler Adapter - Fits General Motors (GM) 6L80, and 6L90 Transmissions
  • Adapter Fitting Mounts onto Original Equipment (OE) Transmission Thermostat
  • 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
  • Port Center/Line to Center/Line Length: 2.628"
  • Overall Dimensions: 3.378" Long x .75" Wide


Adapter AN Size ( A )6 AN MALE
Adapter AN Size ( B )6 AN MALE
Adapter TypeTransmission Cooler
Center to Center Measurement2.628"
Emission Code5
FinishAnodized Black
Material6061 Aluminum
Overall Length3.378"
Product TypeTransmission Cooler
Part Number1133ERL



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

If you want to eliminate the OE transmission thermostat or do not have one on your vehicle, you should use part number 1128ERL instead of this adapter (since it bolts directly to the transmission).
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