ok, So it is things like this that get confusing. From the James duff web sight, It should be all most a "bolt in swap" Then From the explorer forum thread, this guy had to do a huge wiring project. So what is it? A easy bolt in or a hard wiring project?
From james duff:
"4.0L V6: On '86 and newer 2.9L V6 equipped vehicles, this is essentially a bolt-in swap. The 4.0 engine control computer, engine wiring loom, cooling system, and transmission should all be swapped in. This engine makes 170 hp, and can be upgraded with a Duff Power Chip, a free flow air filter, and even a supercharger.
5.0L V8 (Fuel Injected 302): On '86 and newer 2.9L V6 equipped trucks, swapping in the 215 hp 5.0L is similar to the 4.0L swap, in that you'll need to take the engine control computer and engine wiring loom from the donor vehicle. The modifications necessary for installation are mostly the same as the carbureted 302. If all emission equipment is retained, most states will accept it as emissions legal."
Rockin 35" MTZ's