Short story: Friend spun a bearing in his 4.0L powered 2000 Jeep Wrangler.
I found a '99 Wrangler 4.0 motor but I'm having trouble figuring out if they're the same. Some sites list the '97-'03 as the same and other list the '00-'06 with the '97-'99 being different. That chassis was the same so I'm thinking even if I have to swap some sensors I should be able to make it go...
Any help or direction would be appreciated!
I wish I could be more help. I had the engine replaced in my wifes Jeep Grand Cherokee, it was a 2002 model. All I remember was the engine was newer and I was told Jeep made some engineering improvements in the engines that made them more reliable. I would try to get a later model engine if possible, not sure if there would be any sensor problems, do you know how many miles are on the 99 engine?
104k and the guy seems to be legit. He's doing a V8 swap so his entire drive line is available. My buddy has 148k on his Jeep so this would be a good option if it holds together for another few years.
Isn't 2000 when they went to a distributorless ignition? I've got a '99 and as much as I love the 4.0L, I am considering a 5.9L Magnum swap.
The electronics are the only major change. There was a different intake manifold sometime in the early 2000's but it makes no swap difference. I've done 4.2L to 4.0L swaps, 4.0L heads on 4.2L, 4.2L crank and rods inside a 4.0L with no problems. There is serious swappability in the Jeep I-6 family.
DrBoost wrote: The electronics are the only major change. There was a different intake manifold sometime in the early 2000's but it makes no swap difference. I've done 4.2L to 4.0L swaps, 4.0L heads on 4.2L, 4.2L crank and rods inside a 4.0L with no problems. There is serious swappability in the Jeep I-6 family.
His does have a distributorless ignition.
That's good to hear. I just planned to use the original manifolds anyway.
Just get as much of the accessories and bit and pieces from the donor to make sure that the little doo-dad that bolts on "here" is the correct one you need.
Probably the biggest thing to check is electronics. At around that time, a lot of manufacturers changed the number of teeth on the crankshaft reluctor wheel as computers got smarter. I really don't know about the Jeep motor, but I do know Neons changed crank sensors in 2003- everything else is identical to the early engines. At least it wasn't already in the car....
I think the intake manifold, water pump, and ignition system were changed around that time.. but its ALL swappable from the old motor to the new one so there's no worries! 
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