Collection: 2020-2023 Duramax L5P Drivetrain & Transmission

6.6L Duramax L5P Transmission

Transmission upgrades and TCM tuning for the 2020–2023 GM 6.6L Duramax L5P. A built transmission keeps power to the ground as engine output climbs. Every part is matched to your truck and the rest of your build.

Transmission

Transmission hardware and TCM calibration for trucks that tow or make added power. Build the transmission to match engine output to keep it reliable.

Compatibility

Organized by confirmed fitment for the 2020–2023 GM 6.6L Duramax L5P.

FAQ

Do I need transmission tuning with more power?
Yes — TCM calibration and supporting hardware keep the transmission reliable as engine output climbs.