2015.5 - 2016 GM 6.6L LML Duramax T87 | Allison Transmission Tuning by PPEI.
2015.5 - 2016 GM 6.6L LML Duramax T87 | Allison Transmission Tuning by PPEI.

2015.5 - 2016 GM 6.6L LML Duramax T87 | 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 eliminating 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, or EZ LYNK AutoAgent 2.

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Customer Reviews

Based on 17 reviews
Justin Reflogal
Great Tuning, well worth it!

I had my “race engine” LML tuned two years ago and had no clue a trans tune existed. It made a huge difference, wish I would’ve figured this out two years ago. It shifts so much better now and matches the performance output of my engine.

Garrison Smith
Well worth it

Great support and a quality Tcm tune. Truck is 100% different in a better way. Keep it up ppei

Stephen MIller
TCM Tune

Love the firm shifts after the tuning.

Dj Basler
Trans tuning

Way better than tuning I had previously from and different company, truck has alot more get up and, great from shifting, definitely recommend for stock or tuned trucks

Anthony rosi
Why did I wait so long

Made a huge difference. Great customer support. Would highly recommend ppei trans tunes


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.