This is for trucks who have already purchased a support pack and are already linked to us. 

If you’re running a tuned L5P but still stuck with stock TCM mapping, you're leaving serious performance on the table. The NRE EZ Lynk  Transmission Tune File is the missing piece. It’s built to unlock the full potential of your transmission by improving shift timing, torque management, and drivability—no more sluggish shifts or gear hunting.

This is not your average trans tune. It’s built specifically for the 2017–2023 L5P Duramax, designed to work with your engine tuning to deliver smoother shifts, more power to the ground, and a way better driving experience whether you're loaded up or cruising empty.