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 13 reviews
Best thing I have ordered in a long time!

I Hated how the stock trans tune shifted, lazy, and would not stay on top of the charger. After the trans tune it was a whole different animal, good firm shifts, stays on top of the charger. Up shifts are more calculated and precise, down shifts are firm and aggressive. All around the best money I have spent in along time, it was exactly what my truck was missing.
Don't worry it's not like your uncle Jimmy's buddy put a shift kit in your 700r4 and a corvette servo and bangs you head off the head rest every time aggressive. This is good like, you know she's got a back bone and can take some shots and put a smile on your face.
Raise hell and praise Dale brothers!

Brian Vanstory
Trans review

Still waiting to see if the transmission relearns it self after a few hundred miles.3rd gear slips or torque converter delays shift

Jonny Torrence
Lml a50 tuning

Wow is an understatement! Truck drives like a whole new truck,it fixed my throttle lag and completely changed how the truck drives. Huge thank you to Logan for all the time spent answering questions and making sure I flashed the tcm correctly!
Thanks again Logan I appreciate ya

Lml TCM Tuning

I wish I would have purchased this a long time ago! It pairs perfectly with my ECM tuning from PPEI and makes the truck a lot more enjoyable to drive. Shifts are so much cleaner even when throwing the power to the truck!!

Chad Miller
15 lml trans tuning

Kory, Logan, Zach and crew are beyond top notch to work with and the trans tuning we dialed into 100% perfection. The guys work relentlessly, very responsive and I will be buying all trans tunes from them for the rest of my time wrenching. Very satisfied


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.