Mike Harrington
Full Access Member
- Joined
- Apr 27, 2020
- Posts
- 71
- Reaction score
- 9
- Location
- Briggs,Texas
- First Name
- Mike
- Truck Year
- 1989
- Truck Model
- K3500
- Engine Size
- 454 7.4
I've got a 1989 k3500 with manual transmission and it had the Mark IV 454 but I'm putting a 454 from a 1995 into it. I got the computer and wire harness from the 1995 with hopes of just switching my out the ecm but I see that is not possible. Is there a wire harness adapter that would allow me to just switch the ECM out and run the one from the 1995? Or how hard is it to switch out the entire wire harness or is it just easier to get a new chip burned for the original ecm or will the old chip work for the 1995 engine?