What ECMS interchange with 1991 Chevy pickup?

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Galane

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Gregg
Truck Year
1982
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Sierra 3500
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350
What other ECMs have the same hardware as used in a 1991 C3500 standard cab, into which I could swap the chips?
 

Galane

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Gregg
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1982
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Sierra 3500
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350
350, gmt400. That's my donor truck. Is there a way to test an ECM to verify it's good?
 

RetroC10Sport

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A standard 1227747 is most likely what it has.

Really, the only way is to get it started or find a vehicle that uses a 7747 and swap it out. 1987-1991 4.3, 5.0 and 5.7 trucks and vans used that ECM.
 

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