Linclon LS 3.9
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no engine swap is "easy". There are ones that are easier than others like a 5.0 is easier than a 5.4L or a 4.6L. As far as the 3.9 it would defiantly fit but it probably would need custom mounts for the engine and tranny plus custom drive shafts. And obviously no 4x4 since no T-case would bolt up.