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Old February 7th, 2013, 08:14 PM   #1
Blazin79
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258 in a yj frame?

is there a kit for this ? i know might sound dumb but i saved this 258 from my father in law a 78 jeep and thought i can put it in my yj frame... is this doable?
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Old February 7th, 2013, 09:22 PM   #2
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yj's came with 258 in 87 so i would say it is very doable
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Old February 7th, 2013, 11:24 PM   #3
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Bolts in. I did it when I was 17. Remoove cj mounts from engine, bolt on 4.0 mounts and plunk it in. Also a good time to do the 4.0 head swap and keep the fuel injection if equiped.

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Old February 8th, 2013, 07:42 AM   #4
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Quote:
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yj's came with 258 in 87 so i would say it is very doable
Till 89.
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Old February 8th, 2013, 09:21 AM   #5
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use the 4.0 frame motor mount?
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Old February 8th, 2013, 11:40 AM   #6
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Yes. Leave the frame stock and use all the stock 4.0 motor mounts. It all bolts up no problem. I can try to get some pics if it helps.

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Old February 8th, 2013, 11:56 AM   #7
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What are you trying to acomplish?
A 258 is a fine motor but a 4.0 is better in every way. Why not put another 4.0 in the jeep, if thats what it came with. If it came with a 2.5 I would still put a 4.0 in it and use your 258 for parts to stroke the 4.0.
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Old February 8th, 2013, 12:54 PM   #8
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I had a yj with a 258, with a decent carburator it never gave me any problems and had well over 200k.
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Old February 8th, 2013, 12:55 PM   #9
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Its likely not exactly a bolt up, but its not hard to make the mounts work. What motor was originally in your YJ frame? There are some differences betewen earlier and later 258s, I believe, and between a 258 and 4.0, there is some difference in the mounting bosses on the block.
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Old February 8th, 2013, 12:59 PM   #10
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Quote:
Originally Posted by bdd1469 View Post
What are you trying to acomplish?
A 258 is a fine motor but a 4.0 is better in every way. Why not put another 4.0 in the jeep, if thats what it came with. If it came with a 2.5 I would still put a 4.0 in it and use your 258 for parts to stroke the 4.0.
I wouldn't say in every way. IMO, the 258 out-torques the 4.0 in the low range. I have wheeled about 1/2 dozen 4.0 Jeeps, and my last 258 with fuel injection and a few mods always felt stronger than any of them.


For me, it would depend a lot on what came in the YJ to begin with, and what you were looking for out of it.


I'm going through the decision myself in my CJ7. As long as my engine gives em good compression, I'll toss a 4.0 head and FI on it and call it good. I have seen a few chassis dynos of that combo, usually around 130whp and 190ish wtq, where 4.0s seem to be 140-145hp and 175-180 tq.
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Old February 8th, 2013, 01:00 PM   #11
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The 258 I used was an 82. With stock ax-15, 35s and 4.56 gesrs I am able to make older grand prix look silly at the stoplight drag (unless I miss 2nd lol).

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Old February 8th, 2013, 08:20 PM   #12
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well i wanted to used the 258 just because it was my father in law the yj is a 93 and it didnt have motor mount or motor when i got it ... but i do have 258 and the drivetrain that came out of 78 cj i used mainly interior, door , dash etc on this yj tub and frame
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Old February 28th, 2013, 10:46 PM   #13
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anyone have a 258 motor mount and frame mount for a YJ? the yj i have is a 93
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