TCM Tuning Kit

The Spelab L5P Transmission (TCM) Tuning Kit provides premium transmission calibrations specifically for 2017–2026 GM Duramax L5P trucks, designed to complement upgraded powertrains. This kit requires only licensing of your factory TCM and uploading pre-built tune files. It precisely recalibrates shift timing, shift points, torque converter lockup behavior, and transmission hydraulic line pressure. This full transmission control module enhancement requires no replacement physical components. The kit is compatible with stock T87A (2017–2019) and T93 (2020–2026) TCM units. Key features include redesigned shift maps to accommodate heavy hauling and daily driving, custom shift point calibration raised or lowered past OEM limits, and precisely calibrated shift timing for smooth, consistent gear changes. It also optimizes torque converter lockup for reduced slippage under load and improved fuel efficiency, while recalibrating transmission line pressure for firmer clutch clamping to reliably handle increased torque output. Specifications include T87A for 2017–2019 models (6 & 10-Speed) and T93 for 2020–2026 models (Diesel only). The kit includes 4 OBD2 tuning credits and requires an OBD 2 Flash Tuning Interface. The intended use is for off-road use only, and it is a final sale, non-refundable item.