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Unread 09-04-2013, 08:17 PM   #1
jeepster02
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Best/easiest small block swap

At some point, I want to do a small block swap in my YJ. It currently has a rebuilt 2.5l. It wont let me upload pics from my phone or I would post rebuild pics. I would prefer to go fuel injected, but open for other options.

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Unread 09-04-2013, 11:06 PM   #2
uberxj92
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Just sold a cj with an lt1. Only kept it for 2 months after the swap. I just didn't like it. Felt wrong MPG sucked and had to spend more time and cash on fuel cell. The stock tank and lines were no where near good enough.
I would suggest an inline 6. Either the 4.2 or 4.0. The 4.0 would be great with efi and stroke it.
If its speed you want then you could hear it better. Just a thought
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Unread 09-04-2013, 11:42 PM   #3
jeepster02
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Correct me if I am wrong, but I thought maybe the mpg wouldnt change much. This is why, the 4cyl has to work harder and only gets like 17 mpg. So, I figure, not having to work as hard, the mpg for the small block wouldnt be much different, if not a little better. The mpg really isnt too big of a deal, because the furthest we drive it is about an hour away and thats only to go the river. Id be totally fine with an inline 6. I would just have to find one cheap.
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Unread 09-05-2013, 09:56 AM   #4
JeeperDon
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Just figure that everything you do to a Jeep will make the mileage worse. Get past that crap and stick with the desire to get more power. I went with a 4.3V6 from a 2.5L, and with the 4.88 gears I've never had power issues on or off road.
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Unread 09-05-2013, 10:23 AM   #5
jeepster02
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Ok then, inline 6 it is. Now I would assume a donor Jeep or scrap yard would be a good place to start. I am not too familiar with engine swaps, so what all would I need. T-case, tranny, etc.
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Unread 09-05-2013, 09:09 PM   #6
uberxj92
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Lots of Google info and threads on swaps. You first need to decide Carb or efi. Efi is the best way to go then you'll want the 4.0.
You'll need the engine harness or make one, the ecu, sensors.
If you go automatic Tranny you'll need the linkage and tcu.
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Unread 09-05-2013, 10:57 PM   #7
jeepster02
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I would much prefer manual tranny and efi, but it all comes down to what I can find when I have the funds.
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Unread 09-06-2013, 04:54 AM   #8
uberxj92
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What year is your rig? Stick or auto? I ask cause it will help us give you advice on the easiest swap
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Unread 09-06-2013, 08:13 AM   #9
jeepster02
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I have a 94 yj with a manaul tranny.
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Unread 09-06-2013, 08:43 AM   #10
rjbruzan
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Easiest is a Carbed Stick shift.
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Unread 09-06-2013, 10:26 AM   #11
jeepster02
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Ok, so carb would be easiest, but I think I would just rather have efi. It cuts down on having fuel issues IMO. I assume the 4.0 would be the route then. So, the next question is and might be a dumb one, but would I need the tranny/t case for the 4.0 as well or would mine work?
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Unread 09-06-2013, 11:30 AM   #12
rjbruzan
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Yes. Get a whole 91-95 Cherokee as a donner vehicle.
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Unread 09-06-2013, 12:50 PM   #13
jeepster02
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Ok, well I guess when I have the funds, I will work on getting the parts. Thanks for all the info fellas.
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Unread 09-06-2013, 12:58 PM   #14
uberxj92
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94's had 4.0's too. Most of the mounts should work.
Look for ax15 Tranny easy swap with yours
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Unread 09-06-2013, 01:13 PM   #15
jeepster02
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Ok, thanks alot. I am sure I will have more questions once I have the stuff.
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