GM Duramax L5P - TCM Tune (2017-2023)
Type: Tuning Credit | Fits: GM Duramax
Unlock smoother, stronger, and more reliable shifting with tailored TCM tuning for your 2017–2023 GM Duramax Silverado & Sierra 2500/3500 6.6L trucks. This upgrade enhances drivability, protects transmission life, and ensures your truck’s performance stays perfectly in sync with your engine tuning.
Vehicle Fitment
✅ 2017–2023 Chevrolet Silverado 2500/3500 Duramax L5P
✅ 2017–2023 GMC Sierra 2500/3500 Duramax L5P
❌ Not compatible with non-L5P Duramax transmissions
Specifications
| Feature | Details |
|---|---|
| Tune Type | TCM (Transmission Control Module) tuning files |
| Improvements | Revamped shift schedules, modified shift points, optimized torque converter lock-up |
| Transmission Pressure | Adjusted for durability and smoother transitions |
| Required Components | OBD2 Flash Delete Tuning Interface, Unlocked TCM, 4 tuning credits |
| Intended Use | Off-road / race use only |
What’s Included
- Custom-tailored TCM tuning files
- Revamped shift points for maximum boost range
- Adjusted torque converter lock-up settings
- Optimized transmission line pressure for enhanced durability
Key Features
- Smoother, finely-tuned gear shifts
- Sturdier shifts that extend transmission life
- Maintains engine performance with optimized transmission response
- Designed to complement engine tuning upgrades
- Unlocks hidden drivability improvements for L5P owners
Benefits
- Improved throttle response with optimized shift points
- Enhanced driving comfort from smoother gear transitions
- Increased reliability and protection of the transmission
- Stronger, more confident shifting under heavy load or towing conditions
Essential Components for Tuning
To use this TCM tuning file, you’ll need:
- GM Duramax L5P – OBD2 Flash Delete Tuning Interface
- An unlocked TCM (specific to your model year)
- 4 tuning credits
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
