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In general terms you need a ECM that matches the car, they can't be swapped between any year, say a 94 ECM won't work in a 96. Also the auto./manual trans I think are different. Also if from the same year you need to check the gearing or the speed-o will be off. (that can be fixed with tuning.) The LT1 cars changed almost every year, I think only 96-97 are the same.
What are you trying to do? It's rare for them to go bad.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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