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Tilt · 10-10-2015, 03:02 PM

We didn't have time to go through and change everything in the new ECM last night. The new one came from an '03 Tahoe with a 5.3/4L60. I have the 4L80 in the truck. Will it hurt to drive it a little without the ECM being reprogrammed for the 4L80?

10-10-2015, 03:02 PM	#1
Tilt Registered User Join Date: Jul 2014 Location: Dayton, TX Posts: 335	Will it hurt to drive it? We didn't have time to go through and change everything in the new ECM last night. The new one came from an '03 Tahoe with a 5.3/4L60. I have the 4L80 in the truck. Will it hurt to drive it a little without the ECM being reprogrammed for the 4L80? __________________ '83 Silverado Step Side '85 GMC short bed. '86 Chevy Step Side Custom Deluxe LQ9/4L80 swap (SOLD)