![]() If you’ve done a cam, intake swap, heads, turbo, etc your motor is not going to run properly unless the ECM is calibrated to work with not just the 4L80E, but also with the modifications that you have performed to the engine. If you are going to be doing any sort of heavy modification to the engine, you may wish to send it to a tuner to have the transmission tables changed in the ECM. The advantage of finding a local guy is that if there ends up being any sort of problem they can correct it right there on the spot. If you live in a decent sized metro area, you can probably find someone to do it locally on Craigslist. You just “buy it now” on one of the many re-flash auctions. I’ve done that before with great success. There are plenty of ways to get the ECM flashed. It’ll need to be ref-flashed to properly control the 4L80E. The next thing that you’ll need to take care of when making a 4L60E to 4L80E swap kit is the ECM. It is far and away easier to swap in the adapter. Replacing the entire wiring harness is not easy, convenient, or cost-effective. You’re going to need to run a new wiring harness to communicate with your ECM/PCM. Here’s a good article on the 4L60E vs 4L80E. ![]() It’s not the easiest swap to do, and a 4L60E can handle a lot of power on its own. Here are the main parts that you are going to need in order to make your own 4L60E to 4L80E swap kit. Swapping from the 4L60E to the 4L80E is not difficult to do in vehicles that were equipped with both transmissions.
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