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Tuner in Training
2003 Silverado ECU swap
Hello, I have an ECU already tuned for my setup but it was from my old truck. I?m still in the process of finishing the engine swap. I was wondering if an ECU from a 2003 Silverado 5.3 2wd will work in a 2003 Silverado 5.3 4wd. Thank you.
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The same ECU will work, but will have to be tuned for your specific application...
Namely, your gear ratios, tire sizes, 4wd DTC's and platform options.
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Any ECMs/PCMs that have the same Service Number are interchangeable - after a vehicle-compatible base OS is flashed in.