ECM / PROM Chip for 95 350 swap

[mwojoaa96]

Hey guys I’m swapping my 4.3l out and putting a 1995 donor 350 TBI into my 1995 c1500 4l60e. Guy didn’t have a computer for it. Keeping everything stock on the 350 and using 350 intake.

Wondering what the correct ECM model number is or prom number for that configuration so that I can buy the correct part. Does 1500,2500,3500 change compatibility. And does 2WD/4wd change compatibility


Not looking to reprogram just swap and go, pretty new to this.

This is what I have now.
Vin: 1GTEC14Z6SZ503025

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[Ace17]

What I would personally do is go to the junkyard and find a 1995 c1500 5.7L truck and pull the computer from that. Pretty simple to do - pull the glove box out and there it is. GM trucks started using the 4l60e around 1993, so I would at least start there. You don't want anything after 1995, that's for sure, considering GM switched to the L31 vortecs in 1996. Where I live there are at least 5 junkards in the city area, and they always have a ton of OBS gm trucks.

Precision definitely matters here. Make sure you pull an ECM from at least 1993-95, but preferably 95'. GM had weird fueling change differences in 95' that you'll need to be aware of, so I HIGHLY suggest getting a 95 computer. Make sure you pull an ECM from an automatic truck, vs a manual truck(they have different programming). Make sure you pull an ECM from a 5.7, as opposed to a 4.3, or a 7.4L(different fueling).

From what I've seen, 2wd and 4wd have slight differences in spark tables, and ve tables, but not much though. It would probably be fine. 1500, 2500, and 3500 could have a myriad of differences - engine size, fueling, transmissions etc.

Long story short, I'd go out and find a truck of the same year, engine size, and transmission type, and pull the ECM. GM C/K1500 5.7L automatic trans trucks are a dime a dozen. OR...you could go on eBay or wherever, and find a computer that specifies that it came out of a similar truck that you have.

 

[mwojoaa96]

Thank you for the very helpful answer. I’ll do that!