L5P TCM Tuning Kit

The Spelab L5P Transmission (TCM) Tuning Kit provides advanced transmission calibrations designed for 2017–2026 GM Duramax L5P trucks. This kit is optimized to complement upgraded powertrains by recalibrating key transmission functions. The package includes recalibrated shift timing, adjusted shift points, modified torque converter lockup behavior, and altered transmission hydraulic line pressure to enhance performance under heavy loads and daily driving. This tuning kit requires no physical component replacement, as it is fully compatible with your stock T87A (2017–2019) and T93 (2020–2026) TCM units. You will need to license your factory TCM and upload the pre-built tune files. The redesigned shift maps accommodate heavy diesel hauling and daily driving, while custom shift point calibration raises or lowers trigger points beyond OEM limits. Smooth and consistent shifting is achieved through precisely calibrated shift timing and smoothness, and optimized torque converter lockup logic reduces slippage and boosts fuel efficiency. Increased transmission line pressure ensures firmer clutch clamping for reliable handling of increased torque output. **Specifications:** * TCM — 2017–2019: T87A (Existing unit) — 6 & 10-Speed * TCM — 2020–2026: T93 (Existing unit) — Diesel only * Includes 4x OBD2 Tuning Credits * Requires an OBD 2 Flash Tuning Interface (not included). * Intended for off-road use only. * Final sale — non-refundable. **Important Considerations:** * This kit is exclusively for L5P diesel applications and does not fit gas engine trucks. * An OBD 2 Flash Tuning Interface is required to flash the tune file. Your existing T87A or T93 TCM will be detected automatically when connected via OBD2. * The system is designed to be used with a Windows-based laptop for the VCM Editor + Scanner software; Apple products will not work. * This product is sold as a final sale and is non-refundable. Ensure your year selection and OBD2 interface compatibility before purchasing.