its come time for the swap 4.2 to 4.0 -
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Go Back > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > its come time for the swap 4.2 to 4.0

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Unread 12-06-2009, 10:32 PM   #1
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1989 YJ Wrangler 
Join Date: Oct 2009
Location: maryland
Posts: 326
its come time for the swap 4.2 to 4.0

found a red 94 yj that was flipped broke fron supension but good 4.0 and 5speed tranny to swap my 89 4.2and the nastiest ax15 uve ever heard shift 700 dollars let me know weather u think its a good deal o and diddnt damage hard top or hard dors

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Unread 12-06-2009, 10:56 PM   #2
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2001 TJ Wrangler 
Join Date: Oct 2008
Location: Edmond, OK
Posts: 40
If you don't buy it I'm gonna! lol
I thought I made a mistake once, but it turned out that I was mistaken.
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Unread 12-07-2009, 04:48 AM   #3
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1989 YJ Wrangler 
Join Date: Mar 2007
Location: Homer, Georgia
Posts: 198
Just the top and doors are well worth that.
89 Jeep YJ Wrangler
Weber Carburetor
Aussie Front
4" Rough Country lift
33x13.50x15 tsl's on 10" steel wheels
Red Jeep Club #448
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Unread 12-07-2009, 10:42 AM   #4
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1991 YJ Wrangler 
Join Date: Nov 2006
Location: Barksdale AFB, LA
Posts: 590
if u dont need your 258 after the swap, ill buy the crank and connecting rods if u r willing
Originally Posted by jmathis3 View Post
lots of hair pulling, tool throwing, beer drinking, swearing, and eventualy it will start. haha good luck.
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Unread 12-07-2009, 12:20 PM   #5
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1987 YJ Wrangler 
Join Date: Aug 2006
Location: grafton ohio
Posts: 3,289
I had morre fun building my 258, than swapping in a 4.0 with all it's sensors and what not. I have a holley TA 470 4 barrel on an offy intake, comp cam, 4.0 head with rollor rockers, header, MSD, DUI and so on. I don't miss a V-8, this thing gets it done. The fuel pump is on the engine and easy to get to. There's not a bunch of sensors or computer to worry about. The holley TA series carbs are made for off road and will take extreme angles. The 4.0 is a great engine, but so is the 258. If my jeep came with a 4.0, I would have worked with it. My 87 had the AMC 258 that allowed me to use a lot of the old school hot rod tech, it was easy, fun and not that expensive to build a ground pounder I-6. I've had both, 4.0's and 258's, I tend to lean torward the 258 because of there simpicity. The 258 comes with a crappy stock carb, but once you do away with it, then the sky is the limit. Good luck with your swap, but I would research all that can be done with the 258 before you throw the baby out with the bath water. Don't swap just because everyone else is doing it. Simpicity can be your friend when your out in the boonies.
1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed
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Unread 12-07-2009, 12:26 PM   #6
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1989 YJ Wrangler 
Join Date: Oct 2009
Location: maryland
Posts: 326
i dont have any plans on throwing the old engine and tranny out a motor that has been that good to me and never let me sitting cant just be thrown out and i will be selling the doors the top and alot of other things sence i am parting it out mesage me with any thing you might need axels i have a bunch of extra leafsprings will have the stock roll bar out of my 89 yj ill be keeping most as spare parts but let me know if you need nethng
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