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Old 07-05-2008, 05:46 PM   #1
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slow 2.5L

so i havnt had my jeep that long (had a ford ranger before) so im new to jeeps, im running 35's on stock gears, its not bad around town but on the freeway its sloow, i have to downshift to 4th up hills and move to the slow lane i have read that i need to regear, but to what? what gears are best for running 35s? also is there any thing else i should do to help out?

heres what im running:
97 wrangler se 4cyl
4inch suspension, 3" body lift
new exhaust, intake and a jet performace chip (all on it when i got it)

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Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-05-2008, 06:14 PM   #2
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honestly you need more power. you're also gonna have a bad trans guaranteed, if its the manual for sure, not sure on auto. you need gears but if you have the ax-5 5 spd, its not gonna hold up regardless. stronger drive train is my recomendation.

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Old 07-05-2008, 06:18 PM   #3
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Gears, most likey 4.88's, but then your dumping money in the dana 35, so there's that to consider as well.
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Old 07-05-2008, 11:17 PM   #4
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FYI the 4.0 sucks for power too!
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Old 07-05-2008, 11:55 PM   #5
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probly better than the 2.5, i just drove up a really long windy road that was all up hill, by the end i had to shift into 3rd, i miss my rangers power, that 4.0 was pretty mean
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-06-2008, 01:33 AM   #6
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trying regearing and getting a dana 35
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Old 07-06-2008, 02:35 AM   #7
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how much are the new gears? is it alot of trouble to swap to a bigger axle?
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-06-2008, 07:29 AM   #8
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if i was going to run 35s on a 4cyl. (which i wouldnt do) id put in a set of 513 gears and while your at it at least upgrade the axles too.
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Old 07-06-2008, 08:57 AM   #9
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Quote:
Originally Posted by RatherBNmexico View Post
trying regearing and getting a dana 35
getting a 35? axle? thats stock, maybe i'm missing something in here, but anywho, the 4.0 doesn't suck for power, it has great low end torque, and all the power you'd need with the right gears, within reason. way better than 4 banger.
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Old 07-06-2008, 10:01 AM   #10
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do you wheel it? if so, like mentioned, you'll need to upgrade the rear end....how much upgrade depends on what you're doing. if its a street queen, the 35 oughta be allright. id go 4.88s regardless.
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Old 07-07-2008, 12:59 AM   #11
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no i wheel it, it does fine offroad, does really steep sandy or rocky hill climbs with ease, i can still speed around town if i want, the only problem is uphill on the freeway, then i just move out of the fast lane, especially with strong wind but its not THAT bad, im just used to a 4.0
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-07-2008, 07:05 AM   #12
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With your setup, you're gonna be slow.

IF you are keeping the D35, 4.88 is as low a gearing as you can go. With 33's it is darn near stock. With 35's, it'll be a big sluggish, but not like it is now. 35's on the D35 is a separate issue. With a STOCK D35, you may have issues sooner rather than later. IF you upgrade to the S35 shafts with the 30 spline count and put a locker back there, you'd be better off. I'm on 33's/4.88/D35 and run the Yukon shafts and ARB locker. I am very light on the pedal offroad and let the gearing do the work whenever possible. I feel comfortable with my setup. Depending on YOUR wheeling style, your setup, even with 4.88's, may be a ticking timebomb waiting to blow up - but that is a VERY individual statement I make.

Personally, if I were to go with 35's, I'd be looking for a D44 or 8.8. Once you've done that, you're in a good spot if you choose to drop in a V8 or even put in a 4.0 I6.
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Old 07-07-2008, 07:50 AM   #13
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Quote:
Originally Posted by lloyd smale View Post
if i was going to run 35s on a 4cyl. (which i wouldnt do) id put in a set of 513 gears and while your at it at least upgrade the axles too.
Can't run 5.13's in a D35.
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Old 07-07-2008, 09:08 PM   #14
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so would i have to do this to the front and back or just the back?
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-07-2008, 09:17 PM   #15
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Quote:
Originally Posted by ExDementia View Post
so would i have to do this to the front and back or just the back?
both.. front and back unless you WILL NOT use the 4wd any more (not even for few feet... NEVER). The tcase is locked at the center so both driveshafts spin at the same speed.

As far as power. Many people report good results on swapping a 4.0 throttle body on the 2.5s. There are few people here on the forum that will die disagreeing but the majority says they see difference. A 4.0 Throttle body will go nicely with your intake and exhaust so.. Direct bolt on.. get one from the junk yard or ebay.

http://www.wranglerforum.com/tj-jeep...-2-5-a-15.html
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Old 07-07-2008, 09:17 PM   #16
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Quote:
Originally Posted by Smeghead View Post
FYI the 4.0 sucks for power too!

i think your out of your mind, the 4.0 is awesome.. i run 411 and 31's with it.
i have more torque and power than i need, so what do you prefer there hot shot, hmmm, small block gm, big block, hemi, 460, huh, are you a diesel nut, cummins power stroke, duramax, cat. is there a reason you don't like the 4.0 or are you just mad you don't have one. anyway keep your problems to yourself!!!

maybe you have a world of war craft powered jeep...hahahahahahahahaahahah
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Old 07-07-2008, 09:36 PM   #17
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My 4.0 is running strong especially in 4 lo. I dont know why you say that.
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Old 07-07-2008, 09:51 PM   #18
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the 4.0 is great. Maybe he has 3.07 gears and 33's or somthing.
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Old 07-07-2008, 09:57 PM   #19
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lol i have 4.0 with few mods on it.. 5 speed with 3.73 and the 35s and it pulls strong.
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Old 07-07-2008, 10:08 PM   #20
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Quote:
Originally Posted by yjwrangler View Post
i think your out of your mind, the 4.0 is awesome.. i run 411 and 31's with it.
i have more torque and power than i need, so what do you prefer there hot shot, hmmm, small block gm, big block, hemi, 460, huh, are you a diesel nut, cummins power stroke, duramax, cat. is there a reason you don't like the 4.0 or are you just mad you don't have one. anyway keep your problems to yourself!!!

maybe you have a world of war craft powered jeep...hahahahahahahahaahahah
Damn, looks like Smeg hit a soft spot with this guy.
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Old 07-08-2008, 12:48 AM   #21
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I also think that 4.0 is powerful enough...
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Old 07-11-2008, 03:03 AM   #22
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ok so i have some money set aside and ive read that heavy modification is required to do a dana 44 swap into my tj, this is my daily driver and isnt an option to have it off the road for that long. if i regear to 4.88's, is that going to be enough for some semi serious rock crawling on weekends? other wise i was thinking about going down to a 1" body lift and going down to 33's
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 07-11-2008, 01:28 PM   #23
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I'm brand new to this and just got a 97 Wrangler SE with the 2.5L I4. I'm going to shop around for the 4.0 throttle body as well as a spacer. I've heard the 4.0 throttle body bolts right on and I've also heard others say it doesn't.....any thoughts??

I'm not exactley a mechanic but I'm just breaking into automotive stuff DIY style. Take a look at these picks and see if I'm in the right spot and throw some suggestions my way.

I don't plan on doing too much wheeling in this jeep, it's more of a fun ride for my wife but I'm going to tinker with it to make the 2.5L run as good as possible.
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Old 07-11-2008, 01:37 PM   #24
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^ read post 15
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Old 07-11-2008, 01:53 PM   #25
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ok so i have some money set aside and ive read that heavy modification is required to do a dana 44 swap into my tj, this is my daily driver and isnt an option to have it off the road for that long. if i regear to 4.88's, is that going to be enough for some semi serious rock crawling on weekends? other wise i was thinking about going down to a 1" body lift and going down to 33's
If you found a used Dana 44 out of another TJ, that would be a very easy bolt-in swap... no modifications would be needed at all. An hour or two and that's it.

As others said, 35" tires with a 2.5L engine are pretty iffy even with 4.88 gearing but 4.88 would still make a night and day improvement for your 35" tires. But one more issue... your present Dana 35c will see a lot more power with 4.88 gearing but that is a mixed blessing: More power but a lot more stress on the Dana 35c's axleshafts that would be even more marginal with more power driving your present 35" tires. Personally I get nervous with a TJ with a 2.5L engine running 35" tires on a Dana 35c, that axle is pretty iffy with big tires like that.
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Old 07-12-2008, 09:09 PM   #26
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Throttle body question

Will a 4.0 throttle body off a 98 Sahara fit onto a '97 Wrangler SE (2.5L)? If so, will the sensors transfer over easily? I found a Throttle body for cheap money but it doean't have the sensors with it.
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Old 07-12-2008, 09:46 PM   #27
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yes the sensors bolt on. From memory there was a little tab on the 4.0 throttle body that you have to break off with some pliers but thats it. Again read http://www.wranglerforum.com/tj-jeep...-2-5-a-15.html

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