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Old 06-20-2012, 06:25 PM   #1
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2.5 or 4.0

I have a 1991 yj 2.5 which I recently put a 4 inch lift on. Do I put more money into it or save up for a 4.0?

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Old 06-20-2012, 06:58 PM   #2
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Depends. How sentimentally attached to it are you?

Or, is it worth putting a larger engine into, to you?

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Old 06-20-2012, 07:05 PM   #3
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its your call man. people love those little 4 bangers and wouldn;t trade them and people also feel the same about the 6 banger.

i have never owned a 4 banger wrangler so i cannot judge them but i have had 4 banger cherokees and comanches and the newer 2.5 is way worth keeping while that old 86 or 87 2.5 was not to much fun.

but in the 6 cylinders, the 4.0 and 4.5 are badass. i have never driven a 4.2
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Old 06-20-2012, 07:19 PM   #4
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its your call man. people love those little 4 bangers and wouldn;t trade them and people also feel the same about the 6 banger.

i have never owned a 4 banger wrangler so i cannot judge them but i have had 4 banger cherokees and comanches and the newer 2.5 is way worth keeping while that old 86 or 87 2.5 was not to much fun.

but in the 6 cylinders, the 4.0 and 4.5 are badass. i have never driven a 4.2
I was actually just talking to a buddy who had a 4.2 and hated it. It was in an 80-something YJ he was working on, and didn't wanna pay to convert it to fuel injection, so he sold it and bought an '02 Sahara

Now, in my opinion for the engine choice, I'd say it depends a lot on what you wanna do with the jeep. If it's just a road-vehicle mainly and for cruisin and looks, you should have no problem with a 2.5. But, if you wanna take it wheelin or tow a lot, definitely go with a 4.0.

When you say save up for a 4.0, I don't know if you mean buy a new vehicle, or buy a new engine. If you realllly feel the need to get a 4.0, I would just save up and swap the engine.
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Old 06-20-2012, 08:00 PM   #5
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I disagree with the wheeling comment. The 2.5 is every bit as capable as the 4.0 as long as its set up correctly. Obviously throwing oversized tires is going to hurt but with a regear it will handle almost everything you can throw at it.
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Old 06-20-2012, 08:04 PM   #6
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True, I just assumed that regearing is something that most people would try to avoid unless totally neccessary. I might just be ignorant because I don't know how to regear haha
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Old 06-20-2012, 08:13 PM   #7
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its definitely not for the normal driveway mechanic. i used to build gear systems for helicopters and without the proper tooling and shims, patterns will not come in and backlash will always be off.
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Old 06-20-2012, 08:23 PM   #8
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Damn, that's a hell of a job! And yeah, right now I'm at Driveway Mechanic but I wanna go to college for engineering so with time ill figure this all out haha
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Old 06-20-2012, 08:27 PM   #9
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you'll get it, no worries. what messes most people up is the shimming. to get a higher backlash, you have to use a smaller shim. people think if i go bigger, the bl will be more. then they figure that out and move to the proper bl changing only one shim and then their gear patterns are not in the right spot on the teeth because they didn;t change the other gears shims to help keep the pattern centered.

its actually not hard but without a dial indicator and whatever tools are required to change the shims, it is very bad.
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Old 06-20-2012, 08:32 PM   #10
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It sounds comprehendable, and of course the proper tools usually help!
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Old 06-20-2012, 08:34 PM   #11
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How much do new gears cost (4.88) and how much will an engine swap cost and is it hard to do?
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Old 06-20-2012, 08:35 PM   #12
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Hard is relative to your skill level and wallet size
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Old 06-20-2012, 08:38 PM   #13
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this is one of the engines i used to build. see the gear assembly in the front that looks just like a differential. used to build those a lot, ha ha ha.
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Old 06-20-2012, 08:47 PM   #14
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Quote:
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Hard is relative to your skill level and wallet size
I myself am not very skilled but I know plenty of ppl with mechanics degrees. How long will it take on average?
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Old 06-20-2012, 09:06 PM   #15
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The 2.5 gets the job done.
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Old 06-20-2012, 09:41 PM   #16
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The only thing is that my current jeep is in incredible shape and color, and I don't want to toatly turn it into my ideal jeep because it looks so nice.
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Old 06-20-2012, 09:47 PM   #17
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so drive it for a few years with minor mods. that is what i have done. no suspension lift, no body mods, only some ammo cans behind the rear seat for tools and bolt on stuff for towing. exterior wise, minus the rims, my jeep looks stock. but here on the beach, which is all we have, my jeep kicks ass. people get stuck wtih huge lifts and tires because they don;t know how to drive in the sand. with a stroker and 31s, my little jeep keeps the wheel speed up and floats on the sand. plus, it works good on the asphalt too
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Old 06-20-2012, 09:49 PM   #18
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its hard to not get into wanting a huge lift and tires but do you really need that is what you should ask. no point in building a monster off road jeep if you drive it on the roads 75 percent of the time. if you want a lift for the look, get a small 2.5 and some 31s. it looks great and everyone says they do well off road
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Old 06-20-2012, 11:49 PM   #19
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Gunz, to answer your question, those who have experience swapping gears generally can do it in a matter of a few hours. An afternoon, a pack of beer, pizza.. And you have a pair of re-geared axles. It is, however, a lot easier to re-gear them when the axles are removed. So it might take a weekend or so (definitely helps to have a reliable backup vehicle).

In all honesty, there is nothing wrong with the 2.5L. Yeah it doesn't pull up hills as quick as the 6 cylinders do, but there's really no point in speeding everywhere. A lot of people neglect to remember that driving was originally intended to be something that you did for the fun of it, not because you wanted to get somewhere fast. Just a couple of days ago a friend drove her SUV off of a cliff down the winding hill I live atop. The reasons were because she was speeding and not paying attention. What's the point in speeding? There isn't any, just relax, cruise, turn your cell phone on silent, turn up some enjoyable tunes. Leave for work 10 minutes earlier if you have to. The 2.5L is VERY good at just cruising, it holds highway speed limits just fine as well, even if you have passengers.

With the mindset that I am out to cruise, not speed everywhere, I have not only been more fuel efficient, but I have also noticed that driving is more enjoyable, even with a 2.5L. I'm seeing a good 20-22mpg average right now, with 29" tires. I'm certain it won't be much lower when I go back up to 31".

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this is one of the engines i used to build. see the gear assembly in the front that looks just like a differential. used to build those a lot, ha ha ha.
Wish I had a turboshaft driving my Jeep, sometimes..
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Old 06-21-2012, 07:17 AM   #20
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Thank u all for your help

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