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 100 HP performance tune. DSP2 switch sold separately.

LB7 Installation Instructions and Product Review

"This item requires an exchange ECM or we can provide one for an additional charge. Please see listings below." - JK

Performance Tune 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

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 250+HP Race. Includes DSP2 switch.

"This item requires an exchange ECM or we can provide one for an additional charge. See listings below." - JK

Race Tune 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. 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.

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Basic tune changes include passlock reset for engine swaps, speedo recalibration, factory updates, and fixing of any Diagnostic Trouble Code issues that were covered by GM factory updates. Also includes ECM recovery from failed tuning attempts and reset to a good clean factory tune.

"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. It also does not fix 2001 limp mode issues. See Kennedy Custom tuning for this." -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.

Requires core return. Note: I did not diagnose your vehicle. If the TCM does the exact same thing the original did then odds are you misdiagnosed.