4.3 to 5.3 runs but bcm problem
 

Hi I swapped out my 2002 4.3 for a 2002 5.3 and had the vats removed. Truck is driving but gauges flash security/alt/fuel, no temp or fuel gauge working and a few other things don't work. I also swapped out the key from the donor truck. I've tried the bcm relearn but since the truck starts up I can't do it exactly like they tell you to so I've had no luck. Is there something I can do or can the dealer fix this for me? Thanks for any info!

This forum is dead I guess