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 7 reviews
Gavin Terry
Lml trans tune

Was worth every penny and drives like a truck should. Crisp shifts and doesnt act like it “rides” the convertor. Drives better and tows better.

Aidan Cornelius
LML Trans Tune

Felt difference immediately. Truck shifts smooth and doesn't get as hot, also increased my mpg

Dillon Dugas
Lml transmission tune

This TCM tune is amazing. Truck went from slipping gears to pulling like a built transmission. Night and day difference!! Very impressed!!!!!

James Holub

I just want to say after getting and installing the tune. My truck shifts smoother and the transmission dosen't get as hot pulling my toy hauler. Thank you.

Heaven sent

Went from not having fun while driving and always worrying about my transmission to never having to worry.


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.