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Discussion Starter · #1 ·
ok so i have a 2.4, 03, 5speed manuel with about 125xxx miles i want to upgrade to 33s and a 3-4" lift. I know by doing so and wanting the jeep to ride good and not have any problems i should regear.
so my question is instead of regearing and spending $800 on that should i just swamp out for a 4.0 or would that be more $ and the need to swamp/change other things?
 

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$800 for a regear sounds pretty cheap.
Look around here (search) I posted on a thread where someone asked about swapping. I think it turned out that the AX5/15 wasn't a direct fit for the 4.0.
As for the lift, you'll need different rate springs in the front if you want to put the 4.0 in.
Then there's the computer system, the labor, actually GETTING the engine. I figure your lift will run $1000(overestimate) and another $1200 for the regear so maybe $2500 max.
An engine itself in good running condition goes for around that. If you regear properly, I believe 4.88 is recommended or even 5.13, then you should have stock performance.
 

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It will be alot cheaper to regear vs going with a motor swap, especially if there's no issues with your engine. You can live with your current gears and 33's if you have 4.10s. The ideal gear ratio would be 4.56 or maybe even 4.88s.
 

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It will be alot cheaper to regear vs going with a motor swap, especially if there's no issues with your engine. You can live with your current gears and 33's if you have 4.10s. The ideal gear ratio would be 4.56 or maybe even 4.88s.
He's got a 2.4, so it has 4.10 already.
4.56 is good for the 4.0 engine, but that's like going to 3.73 with the 4.0/33s.
4.88 is better, 5.13 may be best.
 

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Yeah but with the PO current 4.10s, running 33's isn't too bad but 4.56s will be more closer to stock than 4.88s. Although, for the cost, I would go with the 4.88s for more power since there may not be enough benefit going from 4.10s to 4.56s.

Gear Ratio Chart


........3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17

27" 2677 2766 2872 3017 3163 3325 3454 3689 3947 4150 4279 4352 4619 4991 5800
28" 2582 2668 2769 2909 3050 3206 3331 3557 3806 4001 4126 4196 4454 4813 5593
29" 2493 2576 2674 2809 2945 3095 3216 3434 3675 3863 3984 4052 4300 4647 5400
30" 2410 2490 2584 2715 2846 2992 3109 3320 3553 3735 3851 3917 4157 4492 5220
31" 2332 2409 2501 2628 2755 2896 3008 3213 3438 3614 3727 3790 4023 4347 5051
32" 2259 2334 2423 2546 2696 2805 2914 3112 3331 3501 3610 3672 3897 4211 4894
33" 2191 2263 2349 2469 2588 2720 2826 3018 3230 3395 3501 3561 3779 4093 4745
34" 2126 2197 2280 2396 2512 2640 2743 2929 3135 3295 3398 3456 3668 3963 4606
35" 2065 2134 2215 2328 2440 2565 2664 2845 3045 3201 3301 3357 3563 3850 4474
 

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Wattapunk...
Stock 4 cylinder TJs have 4.10 gearing from the factory to make up for the power deficiency compared to the 6 cylinder.
The OP will not be happy with that on 33s. It's like having 3.07 with 33s on the 6 cylinder.

OP, just search around here for further opinions because there are many threads on this gearing issue already.
 

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Also swapping up to the 4.0 is just as labor intensive as dropping a v8.
 
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