2011 - 2015 GM 6.6L LML Duramax A50 | Allison Transmission Tuning by PPEI
2011 - 2015 GM 6.6L LML Duramax A50 | Allison Transmission Tuning by PPEI

2011 - 2015 GM 6.6L LML Duramax A50 | Allison Transmission Tuning by PPEI


Extend your transmission life and increase your fuel economy with PPEI Transmission tuning! A MUST for tuned trucks with additional torque.

PPEI was the first to offer transmission tuning for these new allisons and we have not let off the throttle since!

The refined shift points get rid of the low rpm “Lazy” feel these trucks have that force the driver to stab the throttle for a downshift – not cool and a fuel economy killer! For vehicles with larger turbochargers, ppei transmission tuning is a must to get the engine back into a rpm range to match the torque curve of the new turbo.

Along with the improved shift points, PPEI also refines the torque converter lockup strategy to put the power to the ground much more efficiently for improved fuel economy by eliminated unnecessary slip in the torque converter – which also drives down heat in typical “unlocked” conditions.

Lastly (and possibly the greatest benefit) is the increase in line pressure ppei provides. line pressure increases the holding capacity in the transmission by clamping the clutch packs together with more force – this allows tuned trucks (or trucks towing heavy) to have the confidence they need to enjoy their truck for years to come.

This tuning package can be installed using an EFILive AutoCal V2, FlashScan V2, AutoCal V3, PPEI RTD, HPTuners MPVI2 or EZ LYNK AutoAgent 2.

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Customer Reviews

Based on 5 reviews
jay dog
Jury still out

cant really tell the difference in shifting we shall see have about 1200 miles on it so far none towing next week I will tow and see

William Cordle
Trans tuning

Very happy with the results took some getting used to as it shifts totally different from what I was used to but definitely firmer shifts then factory tuning.

Phillip Anthony

Definitely takes the shift lag out and drives like a completely different truck

Luke Littleton
TCM Tuning is a must!

I highly recommend getting the TCM tunes for your truck if you plan on getting ECM tunes. The combination of both make for a seamless transition in helping your truck to adjust to its new power. I couldn’t be more happy.

David Myers
LML Transmission Tuning

I purchased the TCM tunes for my LML, and I could not be more happy when towing shifts are so much better.


PPEI, also known as Power Performance Enterprises, Inc., is led by the business owner and lead calibrator/tuner Kory Willis. PPEI began calibrating/tuning back in 2008, specializing in Diesel Performance but has since expanded into the Gas and Powersports industries. Kory and the team at PPEI have set many world records along with continuing many industry “firsts”. We take pride in knowing that Kory not only prides his work, but also thoroughly enjoys setting expectations high for our team so our customers can have the best products available in the world.