Run VSE - HP Tuners - 2017-2019 T87A L5P Duramax TCM Tuning

Transmission Tuning & TCM Unlock (T87A)

At Home T87a TCM Upgrade Instructions

Take advantage of the best availible tuning to ever be offered on the 17-19 T87A TCMs ! - We can say that because we actually test, and own what we test!

The factory TCM tuning from GM in the T87A leaves a lot to be desired when it comes to proper shift control and torque converter lockup (TCC –L/U). Often the factory TCM strategy will put the TCM into 5 and 6th gear locked up to early resulting in lugging and inability to downshift quick enough – especially when pulling. This problem is amplified when power is turned up.

TCM tuning should be paired with the same tune file writer as the ECM tuner. In similar fashion to the way GM would have done this the ECM and TCM work together, its important for the tune file on the TCM side to have similar torque model inputs as the ECM side. We highly advise against mixing and matching ECM / TCM tuning companies - use the same tuner for both!

Pressure Control - Marketing 101 - use only what you need!

Main line pressure on an Allision 2011+ is controlled via pulsewidth modulation to regulate main line pressure based on torque input requests. While raising line pressure up slightly in the Allisons can be benificial under high load low RPM scenerios we only apply slightly increased line pressure in the areas of the power curve that matter. Raising line pressure without the need for it increases pump wear, increases transmission temperature, and decreased fuel economy - this is well documented.

What the user will see as a result of TCM tuning

• Increased transmission line pressure for holding more HP and torque (G50 solenoid control)
• Revised shift schedule to improve drive-ability decrease lugging and decreases transient response times
• Improved shift timing
• Re-designed torque converter lock-up strategy during TOW/Haul Scenerios
• Allows power transfer from the engine to the wheels more efficiently
• Allows transmission to handle the larger earler torque curve that can be delivered by the L5P

 --> What is required?

• HP Tuners MPVI/RTD Device
• 4 - HP Universal Credits