Money says the buyers have a drive train pulled and ready to drop in.
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It was the V6, I believe a 3.6l.
The 4 cylinder Escape has a 2.0L engine. And is setup for front wheel drive. I doubt it is even remotely close to your '03 Ranger.
I have a 2000 Ranger 4.0 4x4 with 230k miles and 100% factory exhaust. I don't think the Rangers were known for exhaust issues.