Can anyone tell me if it's possible to put a 99 4.0 liter ford ranger into a 2002 ford explorer?

 

Welcome to the forum

I assume you mean 4.0l Ranger engine into a 2002 Explorer engine bay, lol

Joking


1999 Ranger had the 4.0l OHV engine
2002 explorer had a V8 or a 4.0l SOHC engine, so different engines

4.0l OHV engine was more reliable but had 45 less horse power, 160hp compared to 205HP for the SOHC

Assume 2002 has a 4.0l SOHC engine, you would need to swap the 1999 computer and engine wiring harness into the 2002 to run the 4.0l OHV engine
Which would present a few problems with speed sensor and PATS(passive anti-theft system)

2002 automatic trans would bolt to the 4.0l OHV but would need to be the same model of trans as the 1999, an automatic, 5R55, so 1999 computer can control it

So while you CAN do this swap, IMO it would not be a good swap, i.e. lots of work for less power

The 4.0l SOHC engine was also very reliable once Ford got the new tensioner/timing chain design in place, 2004 ish time frame, so 2005 and up used SOHC would be a safe bet, well as safe as any used engine can be, lol.