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Description
6.6L Duramax L5P Transmission (TCM) Tuning Kit | 2017-2025 GMC/Chevy6. 6 Duramax L5P Transmission (TCM) Tuning Bundle Overview This L5P TCM tuning bundle gives your 20172025 L5P GM Duramax the advanced transmission calibration it needs to match a modified powertrain. Simply license your existing TCM and flash the included tune file to rewrite shift schedules, shift points, torque converter lock up settings, and transmission line pressure a complete TCM upgrade without needing new hardware. Compatibility Years:
6.6 Duramax L5P Transmission (TCM) Tuning Bundle
Overview
This L5P TCM tuning bundle gives your 2017–2025 L5P GM Duramax the advanced transmission calibration it needs to match a modified powertrain. Simply license your existing TCM and flash the included tune file to rewrite shift schedules, shift points, torque converter lock-up settings, and transmission line pressure — a complete TCM upgrade without needing new hardware.
Compatibility
- Years: 2017–2025
- Makes: Chevrolet Silverado, GMC Sierra
- Models: 2500, 3500
- Engine: 6.6L Duramax L5P Diesel only
- Tuner Requirement: Only compatible with MPVI3 or MPVI4 tuner (Tuner not included, Can be Purchased here ->)
| Year Range | Make / Model | TCM | Transmission |
|---|---|---|---|
| 2017–2019 | Silverado 2500/3500 Sierra 2500/3500 |
T87A | 6-Speed & 10-Speed |
| 2020–2025 | Silverado 2500/3500 Sierra 2500/3500 |
T93 | 10-Speed |
What You Get
When you purchase this bundle, you receive:
- 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
You Will Need (Not Included):
- OBD 2 Flash Tuning Interface — Purchase separately or get it with the All-In-One DPF/DEF/EGR Delete Kit
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.
Technical Specifications
| 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 (sold separately) |
| Intended Use | Off-road use only |
| Return Policy | Final sale — non-refundable |
Key Features & Build Details
- No Hardware Upgrade Needed — Works with your existing T87A or T93 TCM. Simply license and flash the tune file.
- Revamped Shift Schedules — The tune file rebuilds factory shift scheduling to better suit real-world diesel load demands.
- Modified Shift Points — Upshift and downshift thresholds are adjusted beyond factory settings.
- Finely-Tuned Shifts — Shift quality and timing are calibrated for consistent, predictable feel across operating conditions.
- Optimized Torque Converter Lock-Up — Lock-up parameters are revised to improve efficiency and reduce slip under load.
- Adjusted Transmission Line Pressure — Line pressure is recalibrated to reinforce clutch pack clamping under elevated torque conditions.
Installation Notes
An OBD 2 Flash Tuning Interface is required to flash the included tune file — not included in this bundle. Purchase it separately or with the All-In-One DPF/DEF/EGR Delete Kit.
Your existing T87A or T93 TCM will be automatically detected when you connect via OBD2. No hardware replacement needed.
Frequently Asked Questions
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: No. As of March 17, 2026, you can upgrade your T93 TCM directly via OBD2 for FREE. Simply license and tune as normal with this bundle.
Q: Does this bundle fit gas engine trucks?
A: No. This bundle is for L5P diesel applications only.
Q: Is the MPVI OBD Flash Tuning Interface included?
A: No. The OBD 2 Flash Tuning Interface must be purchased separately, or is included with the All-In-One DPF/DEF/EGR Delete Kit.
Q: I already own the OBD2 interface — how do I use the included credits?
A: Provide your interface serial number at checkout and the 4 credits will be registered to your device.
Q: Is this product refundable?
A: No. This is a final sale, non-refundable product. Confirm your year selection and verify you have the required OBD2 interface before ordering.
Q: What if I need a physical replacement TCM?
A: If your T87A or T93 is damaged or defective, contact us separately. This bundle is for tuning existing, functional TCMs only.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy