1987 MJ v8 swap help - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > MJ Comanche Technical Forum > 1987 MJ v8 swap help

FS: Wrangler RGB Multicolor Fog Light LEDs: Awesome EffectSavvy Aluminum Gas Tank SkidFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye Kit

Reply
Unread 01-11-2013, 04:39 PM   #1
Thejim42
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2013
Location: Hobart, IN
Posts: 20
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?

Thejim42 is offline   Reply With Quote
Unread 01-11-2013, 09:19 PM   #2
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 9,967
Lots.
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
cruiser54 is offline   Reply With Quote
Unread 01-12-2013, 08:11 PM   #3
DeejayZeejay
Registered User
1994 ZJ 
 
Join Date: Mar 2012
Location: Macomb, Michigan
Posts: 325
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!
__________________
Jeeps 4 Life!
DeejayZeejay is offline   Reply With Quote
Unread 01-13-2013, 05:33 PM   #4
97_4popper
Registered User
1990 MJ Comanche 
 
Join Date: Jan 2005
Location: Guston, KY
Posts: 463
It has been done, but I understand that keeping a V8 cool in this engine compartment can be an issue.
__________________
90 MJ 4.0 4X4 5sp LB Pioneer Big Ton.
Truck contains parts from 3 MJs, 2 XJs, 1 TJ and a dishwasher.
http://img.photobucket.com/albums/v1...IMG_0101-2.jpg
Check out comancheclub.com...
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.
97_4popper is offline   Reply With Quote
Unread 01-13-2013, 07:02 PM   #5
ftpiercecracker
Registered User
1990 MJ Comanche 
 
Join Date: Jul 2011
Location: woodbury, Tennessee
Posts: 348
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.
ftpiercecracker is offline   Reply With Quote
Unread 01-14-2013, 11:15 AM   #6
Thejim42
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2013
Location: Hobart, IN
Posts: 20
so would it just be cheaper and easier to sell my 5.2 buy a 4.0? since that was in it originally?
Thejim42 is offline   Reply With Quote
Unread 01-14-2013, 01:00 PM   #7
DeejayZeejay
Registered User
1994 ZJ 
 
Join Date: Mar 2012
Location: Macomb, Michigan
Posts: 325
Yes
__________________
Jeeps 4 Life!
DeejayZeejay is offline   Reply With Quote
Unread 01-14-2013, 05:44 PM   #8
Thejim42
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2013
Location: Hobart, IN
Posts: 20
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?
Thejim42 is offline   Reply With Quote
Unread 01-19-2013, 06:54 PM   #9
oderalxjlaredo
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2009
Location: Fairfax, VA
Posts: 395
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.
__________________
--
by the thing that spins when you drive underneath
oderalxjlaredo is offline   Reply With Quote
Unread 01-28-2013, 06:56 PM   #10
Thejim42
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2013
Location: Hobart, IN
Posts: 20
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?
Thejim42 is offline   Reply With Quote
Unread 01-30-2013, 12:35 PM   #11
Madeoflite
Registered User
1997 TJ Wrangler 
 
Join Date: Aug 2010
Location: Lakeland, FL
Posts: 258
I have a 88 Comanche 4.0, tranny, and wiring harness ill make you a good deal on
Madeoflite is offline   Reply With Quote
Unread 02-01-2013, 06:01 PM   #12
Thejim42
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2013
Location: Hobart, IN
Posts: 20
How many miles? 4wd or 2wd and is it auto or stick?
Thejim42 is offline   Reply With Quote
Unread 02-05-2013, 05:05 AM   #13
billyzj
Registered User
1994 ZJ 
 
Join Date: Dec 2011
Location: eustis, fl
Posts: 513
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
billyzj is offline   Reply With Quote
Unread 02-05-2013, 10:15 AM   #14
Madeoflite
Registered User
1997 TJ Wrangler 
 
Join Date: Aug 2010
Location: Lakeland, FL
Posts: 258
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
Madeoflite is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.