What gear ratio are you going to be running?
I have 265/70/16's which are close to the same diameter as 31's. I have maybe an inch over stock and they rub some but not horrible.
With 4" lift I would run 265/75/16's.
You might be able to get away with 33/10.50/15's.
31's wouldn't be horrible but you would have plenty of clearance.
Friend has a Samsung fridge. Don't know if it is the latest fancy one but it has died twice on him and the last time it was going to take a week to get the parts to fix it. Less than a year old.
The value of a 1999 and up WJ/TJ 4.0 is almost double of a older style engine.
You might be better off selling it to somebody that needs one and buying an older 92-98 XJ 4.0.
Same with the transmission.
What Don sez, invest in tools and knowledge instead of paying for somebody elses knowledge.
Also, most any problem you may have with a 91 or 92 will be covered by including those year cherokee in your search for info along with 93 and 94.
Put stock parts back on.
My buddy's 95 YJ still has the stock steering with a dana 60 and 39's. Granted it's really struggling in the rocks but the rest of the time it works fairly decent.
My 4.0 has been run constantly between 2500 and 3500 rpm.
I put 4.10's in it at 240k and it is now at 437k.
Street tires are 31's so figure 30" running diameter at best.
I'm happy with the pep and fuel mileage.
17 mpg no matter how I drive.
It sees redline a lot.
92 ax15 4wd 3.07's 225/75/15. 17-19.5 mpg
Don't really have city or highway but good stretches of 40-50 mph roads.
98 XJ ax15 with 4.10's and 31's averages 17-18.5 mpg.
I wouldn't think that your mileage will get any worse.
I had a can of mix I got from the neighbors that were moving and it was several years old. My daughters boyfriend ran out of gas and they asked me which can to use. They grabbed the wrong one and dumped it in his honda and drove the 10 miles to the gas station without a problem.
Thank you! I wasn't about to pour it into anything of mine.
I run starbrite in the fuel of my small engines and at the end of the season I run 50-1 two stroke mix so it has a good stabilizer in it.
All my equipment starts right up the next season with no trouble.
As long as you keep fresh oil in it doesn't matter a bunch what you run.
And that's as much effort or knowledge they want to put in to it.
Not everybody lives and breathes automobiles.
You probably don't want to buy from those folks anyways.
If it's under a grand and nearly rust free, snap it up.
Engines are cheap, sheet metal isn't.
You won't be able to figure out what it is until you have it in your possesion.