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Unread 04-17-2013, 12:54 PM   #1
azgrandjeeper
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Engine swap 5.2 to 5.9

Hey fellow ZJ jeepers. I got an amazing deal on a 5.9 motor. I paid $200 bucks for and heres the kicker. It still runs and only has 100k on the motor. Well I am going to rebuild it from the ground up. My biggest question is when I put the motor in what do I need to look for in changes for what I have in it now. I know the ECM will need to be changed. Is there anything else? Thanks guys.

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Unread 04-17-2013, 01:04 PM   #2
B93
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I think people typically recommend beefing up the transmission a little bit, a shift kit would possibly be enough along with a separate transmission cooler. You might need an electric fan, but I think that's about it.
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Unread 04-17-2013, 01:13 PM   #3
mudder53
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It's a lot more to take on than just plopping in a new engine. I have the inline 6, not very familiar with the v8s. Just make sure your PCM and tranny are compatible. There might be different sensor connectors and such... Minor things as sensor connectors should be taken into consideration. It can get very spendy when it comes to those damn sensors haha
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Unread 04-17-2013, 04:28 PM   #4
PolkaPower
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It will bolt right up to a 44RE. The V8 5.2 and 5.9 are identical externally. The 5.2 computer will probably run the 5.9. You don't need and E fan. They used that on the 5.9 to free up some HP.
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Unread 04-17-2013, 10:17 PM   #5
ratmonkey
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maan, if this was in the FAQ i could link to it so you'd see everything you need to know. oh, yeah. here's the link.
http://www.jeepforum.com/forum/f13/z...ml#post3020645
flex plate, harmonic balancer, driver's motor mount,
the stock ecu can run it, but it'll be getting close to it's maximum adjustment.
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Unread 04-18-2013, 08:55 AM   #6
azgrandjeeper
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That is some awesome information guys thank you so much! I will probably get a computer for an 5.9 because I am going to rebuild the motor to a few steps up than stock. I.E. Cams, Valve train etc. just to add a tad bit more torque
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Unread 04-18-2013, 09:29 AM   #7
PolkaPower
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Originally Posted by azgrandjeeper View Post
That is some awesome information guys thank you so much! I will probably get a computer for an 5.9 because I am going to rebuild the motor to a few steps up than stock. I.E. Cams, Valve train etc. just to add a tad bit more torque
Or just use a normal 5.2 pcm and get an SCT tuner from Hemifever.
http://www.hemifevertuning.com/

You can call them and tell them what you have done to the motor and they will make custom tunes for your needs. Better than the 5.9 pcm.
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Unread 04-18-2013, 09:53 AM   #8
azgrandjeeper
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OK i will look into that. Thanks for the advice and I am sure that is going to save some money so I dont have to buy a whole new PCM.
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Unread 04-18-2013, 10:15 AM   #9
PolkaPower
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OK i will look into that. Thanks for the advice and I am sure that is going to save some money so I dont have to buy a whole new PCM.
It's about 300 bucks but you get like 3 different tunes. Talk to Sean when you call.
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Unread 04-18-2013, 10:55 AM   #10
B93
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Polka you need to stop talking about the hemifever tunes... I can't afford one right now but the more you tempt me the more I'm tempted to pull out the credit card which I need to avoid for now
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Unread 04-18-2013, 01:42 PM   #11
PolkaPower
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Polka you need to stop talking about the hemifever tunes... I can't afford one right now but the more you tempt me the more I'm tempted to pull out the credit card which I need to avoid for now
Haha I know the feeling I almost bought one last month but some things came up. I'm trying to put my 5.9 back to stock since there is no wheeling around here and it's much more fun to drive with smaller tires. I need to get dat green son. I need my Obama dollars
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Unread 04-18-2013, 02:25 PM   #12
azgrandjeeper
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Originally Posted by PolkaPower View Post
Haha I know the feeling I almost bought one last month but some things came up. I'm trying to put my 5.9 back to stock since there is no wheeling around here and it's much more fun to drive with smaller tires. I need to get dat green son. I need my Obama dollars
Hey let me know if you are going to be selling anything from your jeep. I just might be interested
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Unread 04-18-2013, 02:29 PM   #13
PolkaPower
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Hey let me know if you are going to be selling anything from your jeep. I just might be interested
Ok, it's going to be a while. The wife isn't to keen on anything else happening with the ZJ right now. When I do it will be the spacers, tires, and Bilsteins. The cost of new tires is what's killing me. I just need to pester her some more.
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Unread 04-18-2013, 02:40 PM   #14
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Originally Posted by PolkaPower View Post

Ok, it's going to be a while. The wife isn't to keen on anything else happening with the ZJ right now. When I do it will be the spacers, tires, and Bilsteins. The cost of new tires is what's killing me. I just need to pester her some more.
I would be ingested in those blistines when you sell them. How big are the spacers?
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Unread 04-18-2013, 02:47 PM   #15
azgrandjeeper
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the spacers are what i have been looking for. possibly the wheels to. how big are the spacers
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