[Umbra]

Have an opportunity to pick up some Canyon wheels for way cheap, and they come with a set of 31 10.5 15 tires with 75% tread left.

I've read that bigger wheels and tires can be a problem with the 2.5 engine.

What's your opinions?

 

[RikRotorhead]

The 2.5 has 4:11 gears. You can go bigger but it will not have the same power if you do.
If you don't have a lift, 31's are perfect for you.

 

[Xpress]

I was pushing them around fine. Keep it tuned up and it will scoot.

 

[aw12345]

TJ and 31's is a nice setup, ran that on my yellow Jeep for about 6 months then had to have something bigger. That Jeep is 6 years old and has had stock tires, then 31 bgfg's then 33" Cooper stt, then on to 32" mtr's, which moved to 35"Mickey Thompson MTZ's from there I got 35" Krawlers and now it sits on 35"MK 2's. Keep tires away from that Jeep. Anyway 31" tires works pretty well on a stock TJ

 

[RikRotorhead]

I wan't aware they put a 2.5 in a TJ. Why would they do that? They didn't learn from the YJ?

 

[Xpress]

The TJ got the same MPFI 2.5L the YJ got up until like 2001 when they switched to a more powerful 2.4L.

It's a good engine. The only issue I can see with it is that the powerband is a bit higher than it needs to be. If it pulled hard from 1500-3500rpm instead of 2500-3500rpm then it would be a great engine. My dads truck has a Toyota 22R (carb) and on stock gears with 31" tires it smoked my Jeep, even when I had my stock 4.11 gears and some 29" tires. It has great power from 1500-4500rpm, which is why at one point I was considering swapping in a Toyota 22RE engine into my Jeep. Retains the same size 4 cylinder powerplant, but gains a bit of fuel efficiency and of course, gains power and torque. What my AMC 150 bogs down doing the 22RE putts right on through.

 

[Umbra]

No lift (as far as I can tell) and I like the look and ground clearance of the 31s. I do have to drive interstates quite a bit, and I have read that the bigger tires can really sap the power on hills. A lot of guys seem to think a re-gear is necessary, but I have no idea how expensive that is or how hard the swap might be. After years of blowing money and time on hot rods, I have vowed that everything on the wrangler will be done easily and cheaply, or not done at all. In other words, if i can't do the swap in my garage with mostly hand tools, it aint gettin' done.

I have also read some stuff saying that they didn't have to re-gear, just down shift tho 4th uphill on highways. I could live with that.

 

[Otahyoni]

I had a 88 MJ 2wd with a 2.5L and i always thought that was the meanest 4cyl ive had. I had some 32s on the rear and it seemed to still have some power (would still do a burnout with 32s). It's been a long time since i had it though.

 

[WoodRacing]

you really shouldnt notice that much with 31's I didnt with my 4.0 anyway. I know I know the 4.0 is a differant situation but I still dont think it should kill the power.

 

[wwch99tj]

I run 31's with the 2.5 and its just fine. I don't use 5th unless I'm going about 60. There is a noticeable loss in power, but I have no problems getting up to speed or keeping speed up.

 

[DrakeTJWrangler]

I have 33x12.5R15 Wildpeaks on my 2000 2.5l and I can do around 70-75 on the interstate. But generally I prefer taking the backroads that can take me from NC, all the way to the Blue Ridge and beyond... Why? Less Aholish drivers, which also helps ease my road rage.
You toss 33 on there but you might wanna change your driving habits.