I've seen both have issues. The biggest thing with a swap is that half of the electronics are VIN locked so changing the powertrain module only isn't really possible because of the VIN mismatch. The VIN, however, also tells the PCM which engine and transmission you have and sets up the programming for them. So, if you just take the 5.3 part and code it to the current VIN it will try to run the 5.3 as a 6.2 plus things like security and even the factory stereo uses the VIN to work. Not saying it's impossible but in modern vehicles it isn't fun. What might work better would be to find a complete 5.3 set-up in another truck and swap over all the pieces but doing that it might be easier and less work to just find a replacement vehicle.
Saturday, April 2nd, 2022 AT 7:35 PM