Engine swap gone bad….. help

[Rawze]

(07-17-2025 )Flatbed777 Wrote:  I was hoping you would respond Rawse… I have no problem using the old ecm however the old engine was programmed at the 400 hp calibration is their anyway to program it to a 450 version? Do I have to input the trim codes for the injectors on the new motor to the old ecm?

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Just so their is no miscommunication I am trying to get the 79940637 engine to run in the truck.

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Just checked with Cummins the engine harness is identical same part number for both #4373989..

- It sounds like I had it the other way around, your first post was not clear. .. but in either case. ...

== Use the ecm that came off the old engine.

== Since the harness part#'s are identical, then you should be able to use the newer harness if needed.

== As far as power/torque settings go ... simply copying the program from the ecm using the CT software, and e-mailing it to me.. The power/torque can be changed to what ever level is desired, within reason.