I wonder if this ECM even came with my truck originally. I have a 93 K3500 w/ 7.4 and NV4500. PO told me the engine was not the original engine. I believe it was a used 80,000 miles engine pulled from another vehicle. I wonder if he pulled the ECM at the same time because the 8747 info page does not list my year and model as a possibility. Maybe that is just not a complete list?

Anyway, I have suspicions that the current ECM could be struggling and I was considering getting into tuning. Both of those things would point me towards a different ECM and the tuning aspect leads me towards an ECM that has more support for it like the 7747, 7060 or a 7427?

I would imagine with any of those I would have to re-pin the harness that plugs into the ECM (Except maybe the 7747?). Anything else I should be considering? Thanks.