The thread title says 1997 c2500 but above you said 1995.
Which is it?
You said it’s TBI so… 1995, yes?
Look in the glove box of both for a GM sticker that lists the production codes... there may be perhaps 60 three letter codes on that sticker. Look for any of these specifically and post them:
- MW3 (NV4500 manual transmission)
- M50 (NV3500 manual transmission, wide ratio, 4x4 applications)
- MG5 (NV3500 manual transmission, close ratio, 2x4 applications)
You quite possibly have the same transmission in each, MG5, although clutch may differ.
While you’re at it look for the rear end ratio RPO:
- GT4 (3.73 final gear)
- GT5 (4.10 final gear)
- GU4 (3.08 final gear)
- GU6 (3.42 final gear)
This info might come in handy later.
Quite possibly you have the 16197427 ECU in both trucks; you can look on each to find and compare their part numbers.
Regardless, you could reuse the 1995 ECU in the 1994, and you’ll certainly use the MEMCAL (“chip”) from the 1995.
Whether the engine wiring harness is exactly the same, that’s still for debate. I seem to remember they used different knock sensors (two on 4.3 vs one on 5.7… or maybe the other way around), so wiring there may differ.
All accessories should fit and function.
Hopefully others will comment further.