Single level tuning for the Duramax LMM. Tunes available to produce anywhere from 40HP economy/tow, 70HP Perf tow and more. While economy gains cannot be guaranteed, the economy tune has been producing very consistent mpg numbers at around 19-20mpg and sometimes more for single wheel trucks. Smooth shifting, low EGT's and more power/response than many 80 and 100HP rated generic tunes.

Installation Instructions

Tunes available to produce up to 150-200RWHP gains while still remaining tame enough to act as a daily driver. Smooth shifting, lower EGT's, and more power/response than many higher claimed generic tunes.

Installation Instructions

Brand new AC Delco TCM pre programmed to your VIN. Just install and go.

Requires core shipped in advance.

Please note: I did not diagnose your truck. If the new unit does the same thing as the old unit then it's a misdiagnosis, but the transaction is final as there are no returns on electronics once installed.

We keep these in stock and program to your VIN so you can just drop in and go.

Brand new OEM Allison TCM programmed with your stock file based in VIN. Plug and play installation. This model fits 2009-2010 LMM and 2011-2014 LML that were equipped with the A50/T14 TCM module. Please verify this by checking the numbers laser engraved on your module. Please include model year and VIN in your order notes when you order. 

Matching core return required.

Please note: I did not diagnose your truck. If the new unit does the same thing as the old unit then it's a misdiagnosis, but the transaction is final as there are no returns on electronics once installed.

The new units WILL NOT work in the Kodiak medium duty trucks. The proper software has never been developed by GM.

Please note: I did not diagnose your truck. If the new unit does the same thing as the old unit then it's a misdiagnosis, but the transaction is final as there are no returns on electronics once installed.

Used replacement model A40 TCM module for the 6 speed Allison transmissions in LBZ and LMM trucks from 2006-2008. Programmed to your VIN and stock calibration.  30 day replacement warranty.

The 2009-2010 LMM and 2011-2014 LML trucks used the A50/T14 module. Please be sure to check what your vehicle has in it. It is etched into the case in very fine detail.

These things used to be commonly available, but suddenly in short supply so the price has gone nuts. Standard pickups and vans should use the NEW units. Kodiaks cannot use the new ones so we save the used ones for those vehicles. -JK

If you do plan to return your ECM core but need us to supply you with a loaner, please select this item. We can also program the ECM to any factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale. Core must be returned within 15 days unless other arrangements are made or it will be billed as non refundable. ECM core exchanges MUST be in proper working order and must be returned within 15 days (unless other arrangements are made) or it will be billed as non refundable.
Please note: If core deposit only is selected any future updates will require that the ECM be sent to us for the update.

If you do not plan to return your ECM core please select this item. We can also program any ECM to your factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale.

This item is for those who already own an EFI Live Flashscan unit, but would like to purchase tuning. It will require submission of the original tune file as read from the vehicle and the ECM serial number to be sent ahead via email. EFI Live licensing and loading of the tuning is handled by the end user.