Thank you for the info. Something I didn’t notice before I posted was that the chip only has 24 prongs. I don’t have any of those chips but do have a bucket or more 7427’s plus the one from a c3500 I was saving for my regal with 455 and 4l80e. That 4l80 is so dang heavy (it’s from a UPS truck) that my front end is sagging so was thinking about putting it in the 1ton replacing the 400 for overdrive and lock up so I guess it would b better to switch ecm’s now huh? If I remember right there is a thread about the switch from 8747-7747(didn’t pay attention which one I had) to the 7427 isn’t there? When I get more time I’ll search but I can get color wiring diagrams so may be simple as that plus trans harness. If you have any suggestions I would b more than willing to listen :-) and thanks again! Sorry I wasted your time on that first question.