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Old 03-01-2011, 04:15 PM   #1
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4 cyl, with 307 ratio

has anyone seen this. or better yet driven one.? its on stock 215 tires, is it ok if left bone stock?

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Old 03-01-2011, 04:21 PM   #2
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Yeah I don't see why not. When you say stock do you mean the entire Jeep or the axle gears?

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Old 03-01-2011, 04:47 PM   #3
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I thought the 4 cyl. tjs only came with 4.10 in the 5 speeds, and 3.73 for the autos.

My 6cyl. has 3.07s with 33s and it sucks. I cant wait to swap my rear axle and regear.

If your leaving it stock with stock size tires you should be fine though.
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Old 03-01-2011, 05:56 PM   #4
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I've never heard of a 2.5l TJ with 3.07 gears. I don't think that combination exists in a factory build.
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Old 03-01-2011, 08:11 PM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
I've never heard of a 2.5l TJ with 3.07 gears. I don't think that combination exists in a factory build.
I'm 90% certain that was never a factory option.

I have 3.73 in my 4 cylinder auto, and 3.73 in the 4.0L (sport package d44)

There were no options for gear ratios in the 2.5L. 4.10 for manual, 3.73 for auto.
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Old 03-01-2011, 08:33 PM   #6
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na cause i have have two tjs, a 4cyl 5 spd with 410s. and a 6cyl 5spd with 307s,

the 4 cyl is lifted on 33s, the 6 is bone stock.. im swaping everything over this weekend, and i really dont want 33s with 307 ratio, but if i put the axles with 307s on the 4 cyl with the factory 26inch tall tires, i think it would be comparable to the 410s on 33s.

plus i mean i got alot of engine work to the the 4 cyl so that will help. i was just wondering if anyone else actually did this. and how it worked out
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Old 03-01-2011, 09:54 PM   #7
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Well, just think of it this way. The factory 2.5L wranglers came with 29 inch tires with 4.10s, and they can struggle at times. With 3.07 on 29s on a 2.5, you're taking it way out of it's power band.

I've never tried it, but I'm fairly certain it's going to be miserable.
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Old 03-01-2011, 10:00 PM   #8
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hey if it will do 55 ill be happy.
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Old 03-02-2011, 02:54 AM   #9
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it seriously might not hold at 55mph, at least in 5th. My 6er with 3.07s and 31s struggles at highway speeds on any kind of a grade (in 5th).

And as most of you guys were saying, according to Wiki and numerous other sources there was never a 3.07 offered in conjunction with the 4 banger TJ.
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Old 03-02-2011, 05:53 AM   #10
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2.5 + 3.07s

If you do decide to swap, get before and after 0-60 times.

That is, if it will do 60 after.
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Old 03-02-2011, 05:03 PM   #11
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honestly the 4 cyl is going to be sold in a week to a couple of foreigners im keeping the 6 cyl which will have 410s.
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Old 03-02-2011, 05:17 PM   #12
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Quote:
Originally Posted by jeepskala
honestly the 4 cyl is going to be sold in a week to a couple of foreigners im keeping the 6 cyl which will have 410s.
Are you going to tell them? If not, that's pretty shady.
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Old 03-02-2011, 09:00 PM   #13
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In 99 I bought a new tj 4 banger with 4.10 it had 215s I went to 235s and I hated it. I kept it for 14 months and sold it.
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Old 03-05-2011, 09:43 PM   #14
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ok well i did the swap. and the 2.5 with 307 ratio, not as bad as i thought. the truck does get up to 65 but any incline it goes down to 55 but it does go... oh and 5th gear is useless with the ratio, lol

the 6 cyl with 410s and 32s great.. chirped 2nd with out trying.
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Old 03-05-2011, 10:03 PM   #15
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Quote:
Originally Posted by MikeMYJ View Post
Well, just think of it this way. The factory 2.5L wranglers came with 29 inch tires with 4.10s, and they can struggle at times. With 3.07 on 29s on a 2.5, you're taking it way out of it's power band.

I've never tried it, but I'm fairly certain it's going to be miserable.
I got 31s with my 2.5 ! it cant get out of its own way !

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