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Unread 01-11-2013, 04:39 PM   #1
Thejim42
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1988 MJ Comanche 
 
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1987 MJ v8 swap help

I just bought my uncles 87 comanche 2wd that had the 4.0 i6 but he kept it for his wrangler. I have a 5.2 v8 out of my dakota that got crushed by a tree and im trying to find info on what it would take to put the 5.2 in the jeep. I've seen people put 5.9 v8s in them and the 5.2 and 5.9 are interchangeable so what would i need to do?

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Unread 01-11-2013, 09:19 PM   #2
cruiser54
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Lots.
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Unread 01-12-2013, 08:11 PM   #3
DeejayZeejay
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Been researching this a bit, as I'm thinking of doing this.... Requires quite a bit. Wiring harness reworked/modified with computers. Beefier coils, radiator, engine mount Fab, exhaust routing, crossmember modification, sheetmetal work, driveshafts.... and more. Would be so worth it!
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Unread 01-13-2013, 05:33 PM   #4
97_4popper
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It has been done, but I understand that keeping a V8 cool in this engine compartment can be an issue.
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90 MJ 4.0 4X4 5sp LB Pioneer Big Ton.
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http://img.photobucket.com/albums/v1...IMG_0101-2.jpg
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My build thread: http://comancheclub.com/forums/viewt...hp?f=7&t=27756
Wifes: 97 TJ 2.5 4X4 5sp 31's stock. . . Slow but; reliable.
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Unread 01-13-2013, 07:02 PM   #5
ftpiercecracker
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Quote:
Originally Posted by 97_4popper View Post
It has been done, but I understand that keeping a V8 cool in this engine compartment can be an issue.

HIGH cfm fans electric or mechanical, 3 core ALL metal radiator, high flow t-stat, high flow water pump, and if all else fails

hood vents.
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Unread 01-14-2013, 11:15 AM   #6
Thejim42
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so would it just be cheaper and easier to sell my 5.2 buy a 4.0? since that was in it originally?
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Unread 01-14-2013, 01:00 PM   #7
DeejayZeejay
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Yes
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Unread 01-14-2013, 05:44 PM   #8
Thejim42
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will the H.O chrysler straight six fit in place of the AMC straight six? I read that they have all the same mounts and hook-ups. does anyone have any insight? and what years and models should i look at getting the motor from? the is a guy with a H.O from his 93 XJ that he is holding for me...will that work?
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Unread 01-19-2013, 06:54 PM   #9
oderalxjlaredo
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IIRC a number of sensors are different on the Chrysler version. I think the knock sensor, camshaft position sensor, crankshaft position sensor, at the very least are different for the Renix (Renault-Bendix computer used in the AMC models). I think the exhaust and intake manifolds changed a few times - but not sure which years. There is a pretty good amount of info in this forum if you search for "Chrysler to AMC 4.0 Swap" or something along those lines. It has been done many times before without too much trouble. While you are in there, you may want to upgrade the cooling system to the newer style without the pressure bottle.
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Unread 01-28-2013, 06:56 PM   #10
Thejim42
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what year did they change because i found an 89 cherokee with the straight six. if i remember correctly they change in 91. will the 89 motor work in my 87?
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Unread 01-30-2013, 12:35 PM   #11
Madeoflite
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I have a 88 Comanche 4.0, tranny, and wiring harness ill make you a good deal on
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Unread 02-01-2013, 06:01 PM   #12
Thejim42
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How many miles? 4wd or 2wd and is it auto or stick?
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Unread 02-05-2013, 05:05 AM   #13
billyzj
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Quote:
Originally Posted by Madeoflite View Post
I have a 88 Comanche 4.0, tranny, and wiring harness ill make you a good deal on
wheres it at in fl and how much
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Unread 02-05-2013, 10:15 AM   #14
Madeoflite
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Quote:
Originally Posted by billyzj

wheres it at in fl and how much
Central Florida(Tampa area) pm me ill make you a great deal
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