Engine swap on 1989 Dodge Dakota 3.9L
2 Answers
Any time you are installing a different size engine, there will be all kinds of problems. Starting with the motor mounts, exhaust system, Engine Control module, wiring harness, emissions, transmission, etc, etc, etc. This will be an expensive project.
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If you have the A535 (AX500) transmission, that will not last long with a V8. If you upgrade to the Magnum 318 V8 they bolt right up (same motor mounts as your 239 V6 - Basically same engine with 2 extra cylinders). You would need to upgrade to the NV2500 transmission which is good for 300 bhp
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