GDP EZ Lynk Transmission Tune File T87A (2017-2019 6.6L L5P Duramax)

GDP EZ Lynk Transmission Tune File T87A (2017–2019 6.6L L5P Duramax)

The GDP EZ Lynk Transmission Tune File T87A is built for 2017–2019 L5P Duramax owners who are already running engine tuning but still dealing with the limits of stock transmission mapping. The factory T87A calibration holds back shift timing, torque delivery, and throttle control. This file corrects that by giving your 6L100 the shift strategy it should have had from the start.

This transmission file is designed specifically for trucks equipped with the T87A TCM and installs through the EZ Lynk platform. It aligns with your existing GDP engine tuning to keep shift behavior consistent under load, during acceleration, or when cruising empty.

What’s Included

Transmission Tune File – T87A Specific
Calibrated for the 2017–2019 L5P. Adjusts shift firmness, reduces flare, improves torque transfer, and tightens converter behavior for towing, throttle response, and daily driving.

Why GDP TCM Files Stand Out

• Built to match your GDP engine tuning for consistent behavior
• Strong, clean gear changes under load
• Less gear hunting when towing or in rolling terrain
• Stable torque management for predictable drivability
• Designed specifically around the T87A module used in 2017–2019 trucks

Who This File Is For

• Owners already running engine tuning on a 2017–2019 L5P
• Drivers looking for steadier throttle control and fewer unnecessary downshifts
• Towing, hauling, or everyday use where shift quality matters
• Trucks equipped with the T87A TCM only

The GDP EZ Lynk Transmission Tune File T87A gives the 2017–2019 L5P the shift strategy it needs to match your engine calibration. Consistent shifts, stronger torque handling, and cleaner drivability—all delivered through the factory TCM using the EZ Lynk system.