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Old 05-15-2011, 05:14 AM   #1
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Post 2.5 to 4.0 Info

Hey how's it going? New to the jeep lift. Well really haven't enjoyed it yet but my wife just bought me one as a deployment present. She got a really good deal on it but its a 2.5 which isn't bad since gas prices are horrible. But what i'm posting is to ask a couple of questions. If it was to find a 4.0 and get it rebuilt. Could I just throw it in and not have problems? Like would my jeeps axle/trans anything have any problems. Let me know from your guys experience if anything. I appreciate the info. Thanks guys.

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Old 05-15-2011, 06:52 AM   #2
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You need to replace everything! Even the frame mounts are different. You can reuse the transfer case but you need to change the input shaft to a 23 spline from the 21 spline you have.

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Old 05-15-2011, 07:13 AM   #3
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Drive it like it is and enjoy it. It seems like all everyone wants is power and more power. I just drive it for the fun of it and let the power hungry guys go past me.
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Old 05-15-2011, 07:35 AM   #4
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If you do want more power do a magnum 360 swap like I did. It's the cheapest, easiest swap that I know if. The 335 lb tq are awesome! Oh, and they get better gas mileage then the 4.0
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Old 05-16-2011, 12:26 PM   #5
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Yeah, As Im still deployed I mean I haven't gotten to drive it yet. Just trying to get some info if it does come time to do something that i'll know a little about it
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Old 05-16-2011, 02:48 PM   #6
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unless the engine is bad, I wouldn't do it. I bought my TJ with out a motor so i ended up doing it. You'll need a new almost everything;
radiator, motor mounts, trans, t-case, wiring harness, driveshafts, PCM, but hey you'll already have 4.10 gears!

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