---tab Description--- Our L5P TCM tuning package delivers premium transmission calibrations for 2017–2025 GM Duramax L5P trucks, perfectly optimized to pair with upgraded powertrains. You only need to license your factory TCM and upload our pre-built tune files. It recalibrates shift timing, shift points, torque converter lockup behavior and transmission hydraulic line pressure entirely. This full transmission control module enhancement requires zero replacement physical components. Key Features & Build Details No extra hardware required: Fully compatible with your stock T87A & T93 TCM units. Just complete licensing and flash the provided tune file directly. Redesigned shift maps: Factory shift routines are reworked to accommodate heavy diesel hauling and daily driving loads. Custom shift point calibration: Upshift and downshift trigger points are raised/lowered past OEM factory limits. Smooth, consistent shifting: Shift timing and smoothness are precisely calibrated for steady, predictable gear changes in all driving scenarios. Optimized torque converter lockup: Revised lockup logic cuts torque slippage under load while boosting overall fuel efficiency. Recalibrated transmission line pressure: Higher adjusted line pressure delivers firmer clutch clamping to handle increased torque output reliably. Specification Specification Detail TCM — 2017–2019 T87A (Existing unit) — 6 & 10-Speed TCM — 2020–2025 T93 (Existing unit) — Diesel only OBD2 Credits 4 credits included Interface Required OBD 2 Flash Tuning Interface Intended Use Off-road use only Return Policy Final sale — non-refundable What's Include? ( Denpends on what you choose ) GM Duramax L5P TCM Tune File — Advanced year-matched calibration file for your existing T87A or T93 TCM 4x OBD2 Tuning Credits — Required to flash the tune file via your OBD2 interface Vehicle License — Standard licensing for your truck OBD 2 Flash Tuning Interface Note: An OBD 2 Flash Tuning Interface is required to flash the included tune file. Your existing T87A or T93 TCM will be automatically detected when you connect via OBD2. No hardware replacement needed. What Changed in 2026 T87A (2017–2019): As of early 2026, GM T87A TCMs no longer require a hardware upgrade. Your existing T87A can now be licensed and tuned directly — no new module needed. T93 (2020–2025): As of March 17th, 2026, users no longer need to upgrade the GM T93 TCM with a send-in service or this upgrade kit. Simply license and tune the controller as normal. ---tab FAQ--- Q: Do I need to buy a new TCM?A: No. This bundle works with your existing T87A (2017–2019) or T93 (2020–2025) TCM. You only need the tune file and credits to flash your current unit. Q: What is the difference between T87A and T93?A: The T87A is used in 2017–2019 L5P trucks (6-speed and 10-speed transmissions). The T93 is the successor for 2020–2025 L5P diesel applications. Both can now be tuned directly without hardware upgrades. Q: I have a T93 — do I need to purchase an upgrade?A:...