2007.5 - 2010 GM 6.6L LMM Duramax | Allison Transmission Tuning by PPEI.
2007.5 - 2010 GM 6.6L LMM Duramax | Allison Transmission Tuning by PPEI.

2007.5 - 2010 GM 6.6L LMM Duramax | 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.

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.

We at PPEI take pride in our work and if there is anything you wish to have changed in your transmission calibration,  we are here to make it fit your driving style - "Custom Fit"!

This can be installed with EFILIVE and HPTuners.

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Customer Reviews

Based on 4 reviews
Brad Mallory
Excellent job

When I first tuned my LMM I didn't get trans tuning. At first I didn't mind the lazy feel to it but after I bought a built transmission and higher stall converter it was a lot more noticeable. I should have bought trans tuning a long time ago when I originally tuned the truck. It now drives like a completely different truck. Shifts are quicker and lockup is an instant shift unlike before. If I could give more stars I would. Amazing job!!!

Matthew Boudreau
Highly recommended!!

Love what they did to the software to make this trans come to life.

Charles Nelson

Tows so much better now

Chad Diepenhorst Chad Diepenhorst
Love my LMM

So far so good…got rid of the lazy feel


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.