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Unread 08-12-2011, 12:45 AM   #1
Xpress
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1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: The Great Big Box, California
Posts: 5,811
Going to a 6 cyl! Parts list?

So I need a basic parts list for swapping in a 6 cyl. Not sure if it's going to be a 4.0 or a 4.2.

So what is a basic parts list that I am going to need? I already know i'm going to need the wiring harness for the engine as well as the computer (someone said I can use the stock 2.5?) and motor mounts. Is there a place where I can buy the motor mounts, over cutting them off of a junkyard jeep? AX15 tranny and then converting the NP231 to the appropriate spines. Lets see:

-Engine
-Wiring harness
-Motor mounts
-Tranny
-Tcase spline conversion

Anything else? Converting axles to 3.73 gears? Or should I just put 31" tires back on and put in a new speedo gear for 4.10's?

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[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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Unread 08-12-2011, 01:57 AM   #2
jth0033
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Location: Downingtown, PA
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Check out this page if you already haven't. Should show you write-ups for both the 4.0 and the 4.2
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Unread 08-12-2011, 01:57 AM   #3
jth0033
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http://www.jeepforum.com/forum/f12/4...mation-537763/

would be good if I included the link...haha late night
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Unread 08-12-2011, 11:50 AM   #4
Tompatt
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Location: Macon / Carrollton, Georgia
Posts: 2,798
dude definitely keep the 4.10s!
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Unread 08-12-2011, 01:27 PM   #5
woodmanxxx
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1990 YJ Wrangler 
 
Join Date: Dec 2004
Posts: 74
Be sure you get the original computer that was with the engine, finding an ECU without that SKIM junk was not an easy task.

You will probably need an electric fan, do a search for Taurus fan conversion.

VSS that will allow you to get a speed signal and keep your mechanical speedometer.

I used an externally mounted electric fuel pump.

I will keep thinking about it and write in if I come up with anything.
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Unread 08-12-2011, 02:01 PM   #6
Xpress
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1989 YJ Wrangler 
 
Join Date: Dec 2010
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Can't forget that whatever I do it has to be out of a 1989 or newer Jeep, preferably WITHOUT a carb...

So lets see:

-Engine
-Wiring harness
-Motor mounts
-Tranny
-Tcase spline conversion
-Electric fan (Taurus fan)

Can I use my current radiator or will I need one for a 6 cylinder? Also where does the speedometer cable plug into? It almost looks like it goes into the back of transfer case...
__________________
[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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Unread 08-12-2011, 02:49 PM   #7
wendell
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1987 YJ Wrangler 
 
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If you use the 4.2, you won't need as many parts with the carb, just use a good carb. I run a holley 470 TA 4 barrel on an offy intake. It's been trouble free over the last 3 years. With FI, it would be easier to use the howell kit over mpi, alot less hassels. With the 4.0, you will ned everything, harness, sensors, computer and the list goes on.
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