I have heard the later model ECU (94 95) is faster and smoother running. I want to swap a 95 ECU in my 91 truck. The trucks runs good, just want to see what the difference in drivability is, and try to earn something. I have no idea what ECU is in the 91, just that its been changed at some point, and the sockets on the ECU are the same color indicating an earlier ECU.

I have a 95 ECU, but NOT off a 454 4L80E. What do I need to do to make it work on my 91?

Sorry if I'm not clear on what I trying to do, don't how else to explain. Very new to programming side of things...