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I assume you are suggesting swapping a 4.3 liter Vortec engine into a '91 Sonoma that has a 4.3 liter engine. I believe this would be a major project. The '91 4.3 liter has a TBI fuel injection system and the Vortec uses a different, higher pressure system with injectors at each cylinder. I think you would need to change the fuel pump in the fuel tank, computer, harnesses etc. The Vortec also uses a mass air flow sensor so the air induction system would also need to be changed. Not compleley sure on all the changes necessary but I do believe it would be complicated. I just finished swapping a '90 4.3 into a '94 Sonoma. Both are TBI injected. One thing to watch -- the OIL PAN. The oil pan on the four wheel dirve version has a shorter, deeper sump to fit around the front drive axle. The 4WD version will probably work on a 2WD but I would check it out. Good Luck, Jim

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โˆ™ 2008-01-15 02:44:05
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Q: Will a vortex out of a 94 Jimmy be a direct fit into a 91 GMC Sonoma?
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