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 14 reviews
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

Bryan Vosters
Transmission tune

The technical support was amazing, and they didn't stop until I was able to upload my tune.

Noah Staub
What a Difference!!

2015 with a t87 here. I've had 2 other trans tunes from reputable company's on this truck. Just never seemed right. Finally got the tuning from Kori and his crew, removed the EPC fooler and installed the tune. WOW! What a difference. over the course of the first 400miles of normal driving, I've averages 5mpg more. Shifts are smoother, power is much more instant. Super happy! Thanks Guys!

Weavertown Diesel
t87 file

Best trans file i ever bought!


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.