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Old 06-29-2012, 11:11 PM   #31
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Anyway my original engine got to 214k, (dropped a piston skirt at 175 or so). I have 230 on the rest of the original drive train, with very minimal repairs. Dunno seems pretty reliable to me.

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Old 06-29-2012, 11:14 PM   #32
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Originally Posted by kshaws21 View Post
Yeah I would like to have a 4.0, it has some great advantages. I just don't like the posts where people say the 4.0 will last longer. With good maintenance, the 2.5 will last just as long.
The 2.5 and 4.0 transmissions are geared differently. My 4.0 turns much lower revs ALL the time. I pretty much have to shift at 3,000 with the 2.5 just to match traffic in town. The 4.0 rarely breaks 2,000 in town as it has plenty of torque to pull the tall gears.
My 2.5 turns about 2,950 at 70mph.....the 4.0 turns about 2,200.

My point? Unless the driver is abusive the 4.0 WILL last longer as it is a much better power match and less likely to be pushed hard.

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Old 06-30-2012, 06:52 AM   #33
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The 2.5 is designed to run around 3000 all day long....
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Old 06-30-2012, 12:28 PM   #34
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I would still choose a 2.5, but mine isnt a DD, I do drive it in town, but its a toy and ges trailered to the trails because my suburban can hold more people/stuff.

That being said, anyone who thinks the 4.0 will last longer needs to read this -
How many miles are on your Jeep
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Old 06-30-2012, 07:37 PM   #35
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Thanks to everyone for the insight on the 2.5L engine. As I said in the beginning, I got for basic transportation to work and need 4WD for winter. Mine's got 152,000 miles, and runs great. I do drive a little 4 lane and have no problem running 65-70 MPH with it. My 93 Cherokee has the 4.0L in it and between the 2, the 2.5L runs just as good except getting up to highway speed on the 4 lane.

I look at the whole 4 cyl engine like this, the original had the 4 cyl and if you you hook the earth to it, you could pull in any where you wanted too. I would like to see a new showroom Wrangler go head to head with an old army Jeep. I know the old one would lose on the highway, but off road, my money would be on the oldie.
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Old 06-30-2012, 10:09 PM   #36
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2.5 is a tank. It will never die.
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Old 06-30-2012, 10:10 PM   #37
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2.5 is a tank. It will never die.
Really? I dumped 4k into one with 27k miles and it shot craps...
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Old 06-30-2012, 11:05 PM   #38
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I have many years in the automotive business, people ask me daily " James, how long will this car last?" My answer is always the same "depends on how you take care of it" I've seen a honda B16 blow up at 120k, have seen toyota's with 500k. I know a guy with an XJ 4.0 that has almost 400k. Proper maintenance is everything no matter which engine you have.
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Old 07-01-2012, 12:06 AM   #39
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Quote:
Originally Posted by jameslee97206
I have many years in the automotive business, people ask me daily " James, how long will this car last?" My answer is always the same "depends on how you take care of it" I've seen a honda B16 blow up at 120k, have seen toyota's with 500k. I know a guy with an XJ 4.0 that has almost 400k. Proper maintenance is everything no matter which engine you have.
Nah dude that makes too much sense. They are engineered to break at a certain mileage! :P

A 2.5 would be nice, at 30lbs boost.
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Old 07-01-2012, 08:11 PM   #40
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Having owned both, they are excellent engines. a 2.5 will give you some problems on the highway and once you start adding tires/lift you will notice power issues. For most folks it will do just fine.
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Old 07-02-2012, 10:35 AM   #41
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look at all the arguing like little bitches, listen, they are both great motors or they wouldn't keep using them, I personally have and prefer the 4.0 so the extra power is there if and when you need it and at some point you will and wish you had the 4.0. I had a 90 YJ with a 2.5 and almost 200K on it and it did great as well, however you do miss the power from time to time. So let me ask this, if there were to identical Jeeps side by side for sale, 1 with a 2.5 and 1 with a 4.0 what would you buy, assuming pricing was similar?
The 2.5 suits my purposes just fine. I've got 4.88's on 30's.

That being said - If I could have found a 4.0 in identical condition for the same price, I'd have bought it.

Problem was that the 4.0's were bringing 2-4k more than a similar 4 cyl. From a budgetary standpoint - The 2.5 was the way to go...
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Old 07-02-2012, 10:42 AM   #42
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I've got a 2000 2.5l Inline 4(4 Banger) TJ and I've got 33s and 4.10 gearing. Perfect for cruising. May not be the best on the highway but the highway. I like my back roads.
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Old 07-02-2012, 10:43 AM   #43
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Originally Posted by jefferyc22
Mine has 143K and I hate it. They are severely underpowered for the weight of the jeep. The 4.0 gets almost as good of milage and has the power to actually pass someone if need be. Also a 2.5 engine is hard to find and expensive....4.0's are plentiful and half the price. I just bought a 4.0 TJ just to get away from the 2.5 nightmare.
Hard to find? Are you daft?
If ya hate it. Swap out that biotch for a chevy 350 small block.
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Old 07-02-2012, 10:46 AM   #44
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Originally Posted by jefferyc22
I drove the 4.0 today and the difference is more extreme than the numbers. The 2.5 won't even scratch in first on dry pavement. The 4.0 scratches in 2nd(geared higher than the 2.5).
In all seriousness thou the 4.0 has enough power to merge on those short on ramps and evade highway stacking. Go test drive a healthy 4.0 and than come back here and argue about how a 2.5 is G2G.
You're daft. In all honesty you are.
I can chirp my tires in my 2.5 all day long. And the 2.5s have 4.10 gearing(better than the 3.73).
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Old 07-04-2012, 11:29 AM   #45
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The Wrangler is not a racing vehicle though. I used to try to race around , and the ax-5 transmission is just not set up for it. Any Wrangler owner will find out soon enough that it is intended to be a durable vehicle, in it's own class.
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Old 07-07-2012, 09:13 AM   #46
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All vehicles are different. I have a 96 Honda Accord w. 296k miles and have np prob, my brother has a 05 Honda accord w 140k miles and has all kinda problems. Same goes for Jeeps. Unless you buy brand new, you don't know how the vehicle was treated before you and you could be getting an engine that has been gutted, hence wont last as long. As far as scratching: A 2.5 w/ auto wont, but I bought my 2.5 5 spd used and the rt rear tire was wore out but the other three still had tread. I think it did more than scratch. 1st-4th are strong and get s16-18 mpg on higway on 30's. Can't complain about it.
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Old 01-27-2013, 11:50 PM   #47
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I know an old post... but I just sold mine.. 2.5, engine outlasted the body..... 195,000....... solid.....
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Old 01-28-2013, 06:03 AM   #48
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My 2.5 has 367,000kms on and is still tight as a drum. Very solid engine, and infact the entire drivetrain is good as well. Many Jeepers Ive talked to have said that if your given the choice, a 2.5 is a much better way to go than the 4.0. you get almost the same HP rating in the real world, not near as many cooling issues, and being smaller I find a bit better fuel milage as well. Some of the minor trail riding I do with my Jeep in 4LO will pull me up, over and through everything all the 4.0 do with ease. Even right now with the Canadian deep freeze we just had last week of -28c in the mornings I never had any problems starting or driving mine.
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Old 03-15-2013, 01:04 AM   #49
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AMC first introduced the inline 4 2.5L engine back in 1984. Back then, the engine was carbureted, but the engine matured fuel injection was introduced later. This engine was used on Wrangler TJ, Cherokee XJ, and Wrangler YJ. You can read more from 91-97 Jeep 150 / Jeep 2.5 Engine (Part #: JEEP-150LB-4), it always help me when I need information related to cars, their engines etc.
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Old 03-16-2013, 12:21 AM   #50
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They were also in Dodge Dakota's.
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Old 03-16-2013, 12:51 AM   #51
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I have a 2.4l 6 speed and I love it. Yeah it lacks speed uphill, but who really cares? After you are over the hill you will be back up to speed with no problems. Furthermore, off road it is great, it practically has a granny gear cuz it's geared pretty low. I don't really know why you would need power off-road. Last person I know who tried to power his way through a rut left his drivetrain lying on the floor.
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Old 03-16-2013, 01:27 AM   #52
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I've had both 2.5l and the 6, I did love the power of the six, yet I bought another 4. Two reasons, it was easy to find a stock 2.5 than a 6 and I wanted to build from scratch. The 4 limits my mods from getting to crazy and I know they are built solid. For speed I have a 2012 BMW F800R. I guess I have the best of both worlds. I would have bought a 6 if I found what I was looking for at the right price. I don't regret my 4 in any way. I even put 285k on a 94 range rover that I drove like a jeep to its full capabilities. You get out what you put in.
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Old 06-14-2013, 09:44 PM   #53
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2.5L Engine

I've had my 97 TJ for about 5 years now, well over 100K and it runs fine. Just had to change a couple of sensors here and there. It won't go anywhere fast, but it WILL go anywhere. I'm no expert but I've accidentally wandered onto some nearly black diamond stuff and came out the other end relatively unscathed. I had mentioned to people in the past that maybe I should have got the 4.0, but the response was pretty much the same. "Why? You can only go so fast on the trails anyway." I'm very happy with it and plan on handing it down when I'm too old to go play. It will do 75 on the highway flats, peaks around 50-55 over the Cajon Pass here in So Cal but who cares. If I was in a hurry I woulda left earlier.
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Old 06-14-2013, 09:57 PM   #54
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I am trying to get some info on the 2.5 L engine. How well does it hold up? I know the 4.0 L is good forever, but how about the 2.5 L? I have asked this question before, but no one seems to answer it.

Would someone please give me some insight on this?

Thanks!!!!!
It's just as good. Don't treat your vehicle like a crack whore and it'll be fine.
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Old 06-14-2013, 10:08 PM   #55
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I've had my 97 TJ for about 5 years now, well over 100K and it runs fine. Just had to change a couple of sensors here and there. It won't go anywhere fast, but it WILL go anywhere. I'm no expert but I've accidentally wandered onto some nearly black diamond stuff and came out the other end relatively unscathed. I had mentioned to people in the past that maybe I should have got the 4.0, but the response was pretty much the same. "Why? You can only go so fast on the trails anyway." I'm very happy with it and plan on handing it down when I'm too old to go play. It will do 75 on the highway flats, peaks around 50-55 over the Cajon Pass here in So Cal but who cares. If I was in a hurry I woulda left earlier.
Went up to the cajon pass a while ago. Freakin gorgeous. My i4 did fine :-)

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Old 06-17-2013, 04:48 PM   #56
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I am trying to get some info on the 2.5 L engine. How well does it hold up? I know the 4.0 L is good forever, but how about the 2.5 L? I have asked this question before, but no one seems to answer it.

Would someone please give me some insight on this?

Thanks!!!!!
I have a 2.5L in my 99TJ it lasted 160,000MI of hard use high RPM's on road accelerating, off road abuse (Mud, water lots of hill climbs, Rocks) I was not supprised at all when it went I was suprised it lasted as long as it did with all the things I did to it love the durability but hate the power.
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Old 06-17-2013, 05:32 PM   #57
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Really? I dumped 4k into one with 27k miles and it shot craps...
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Old 06-18-2013, 08:24 AM   #58
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My 97 came with the 2.5, I bought it at 125K miles and it let go at 168K. During that period, we ran the stock 4.10 gears and 32" tires and was able to run trails at Moab, and go pretty much wherever we wanted. Since I was having problems with the AX5, I chose to convert to the 4.0 and NV3550 when the little guy wore out. I am happy with the upgrade. That said, if I were faced with the same situation again, I would buy another 2.5 TJ without reservation if the price was right, I would expect to get about 175K out of it, and if it was pre 1999, I would go to the 4.0 if the 2.5 croaked. However, I strongly suggest that if you're contemplating buying a TJ, do your homework and buy one as close to what you want as you can afford. Don't look at it as what you can change it into unless you're experienced in rebuilding Jeeps. It really is a frustrating pain in the ass especially if you've never done this before.

Running the 4.10 gears and 32" BFG KO's, the engine is right at 2300 rpm at 65 mph. My fuel mileage was right at 19 overall before the change, and now runs about 1 mpg less. The 4.0 has less than 700 miles on it so far, so that may improve. Again, I'm happy with the swap, but I'd really think hard before I'd do it again!
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Old 06-18-2013, 03:38 PM   #59
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Just to give everyone an update, I had my Wrangler for a year and put 18,000 miles on it. Runs great. I'm very happy with my 2.5L engine and the rest of the vehicle.
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Old 06-18-2013, 03:44 PM   #60
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Just to give everyone an update, I had my Wrangler for a year and put 18,000 miles on it. Runs great. I'm very happy with my 2.5L engine and the rest of the vehicle.
Great to hear

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