All tunes are built as dual mode switchable but as these vehicles age I recommend not adding a switch. The tuning will default to the lower HP level which should be plenty safe for a stock transmission. The higher HP will push the limits of the stock transmission. Typical tune sets are 50 HP econ/tow and 80 HP performance tune. While I make no claims or promises, the 50HP economy tune has been producing very consistent economy numbers at around 19-20mpg and even higher for single rear wheel trucks. DSP2 switch sold separately.

Installation Instructions and Product Review

"This item requires your ECM be sent in OR exchange ECM can be provided." - JK

Dyno Plot

Race Dyno Plot

When comparing dyno numbers, please note that my dyno plots do NOT use correction factors. These are no BS dyno runs with no inflation to make sales. -JK

This is a good used replacement TCM loaded with the proper file to match the VIN and stock calibration of your 2001-2004 LB7 or 2004.5-2005 LLY equipped truck.

Core exchange required.

Dual mode switchable tuning allows you to have your choice of two tunes available at all times! Tunes available to produce anywhere from 40HP economy to 200 RWHP. DSP2 switch included with purchase.

"This item requires your ECM be sent in OR exchange ECM can be provided." - JK

Dyno Plot

Race Dyno Plot

When comparing dyno numbers, please note that my dyno plots do NOT use correction factors. These are no BS dyno runs with no inflation to make sales. -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 30 days 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.

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Basic tune changes include passlock reset for engine swaps, speedo recalibration, factory updates, and fixing basic Diagnostic Trouble Code issues.

"This is not a complete tune, only a basic fix and requires the ECM to be sent in to us or a suitable core must be provided. We will not provide a core for this item." -JK