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Old 09-06-2012, 04:50 PM   #1
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5.9L magnum swap questions

Hi all I have a 97 tj with a I6, np231 tc, and 32rh transmission. I have been researching 5.9L swaps and I have more questions now than when I started. I plan on swapping in an 8.8 for my d35 and regearing sometime in the spring or so. So my first question is would the 8.8 hold up to a 5.9 or would I need to upgrade to a s88, along with this question what gears would pair with this setup locked on 35's, sustaining highway speeds if needed ( 70mph on 33s with 3.73s was an interesting experience that will never happen again .)
Second question is do I have to swap out my transmission too? From what I've read the tc is good but I havent heard anything about the transmission, if possible I would like to keep the tranny because of the money spent to rebuild it.
Lastly could the swap (not including the axles) be done for under 3k properly?
Thanks for any inputs, advice, or opinions. This is a distant project that I'm just a tad obsessed with!

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Old 09-06-2012, 07:59 PM   #2
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Nobody?

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Old 09-06-2012, 09:22 PM   #3
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Might try calling a custom shop or somebody like Fortec in Atlanta...
Seems like a deep build.
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Old 09-06-2012, 09:26 PM   #4
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If I was going to spend that much dough I'd go Hemi swap. The 5.9's were under powered in the 90's let alone now.
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Old 09-07-2012, 02:17 PM   #5
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Thanks for the advice about the atlanta shop, would an ORI be capable of helping with something like this? (Atlanta is close to 6 hours away so getting anything other than phone calls will be a challenge)

The hemi would be great except from all that I have read a hemi takes some serious work to get in properly and the 5.2/5.9 swap is the best swap from an ease and economical stand point since the electronis of the tj "talk" well with the engine, also minor modifications to the engine would be needed. Really what I'm looking for is something that can push 35s at 70 mph with little strain, good offraod torque, and isnt going to cost me more than i paid for the jeep. I don't care to be drag racing it or doing burnouts, just a strong engine. Not to be disrespectful or anything I'd just rather stay out of the hemi boat.
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Old 09-07-2012, 02:27 PM   #6
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One issue with the 5.9l is heat, lots of heat, one of the reasons the ZJ's had hood vents. so take that into account. As far as the trans go..i don't think the stocker will hold up. the ford 8.8 is more than okay for the 5.9L. that's about all I know.
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Old 09-07-2012, 03:58 PM   #7
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Originally Posted by 4Jeepn
One issue with the 5.9l is heat, lots of heat, one of the reasons the ZJ's had hood vents. so take that into account. As far as the trans go..i don't think the stocker will hold up. the ford 8.8 is more than okay for the 5.9L. that's about all I know.
Thanks! That's something i haven't heard, how could you counter that? Would louvers and a better radiator work? (please say louver, I've always wanted one but could never justify cutting a hole in a perfectly good hood)
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Old 09-07-2012, 04:04 PM   #8
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You should get 4x4 donor truck, 3/4 ton and the trans will bolt up to your NP231 transfercase. Below are some helpful links. I will be doing this swap myself also.

http://backwoodsoffroad.com/cgi-bin/...play.cgi?cat=4

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Old 09-07-2012, 04:15 PM   #9
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You should get 4x4 donor truck, 3/4 ton and the trans will bolt up to your NP231 transfercase. Below are some helpful links. I will be doing this swap myself also.

http://backwoodsoffroad.com/cgi-bin/...play.cgi?cat=4

HotwireAuto - Fuel Injected Wiring Harnesses
Cool websites, i was planning on getting most of my stuff from backwoods. Keep me posted on how the swap goes, I'm not planning on doing mine till next summer so it doesn't get in the way of school.
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Old 09-07-2012, 04:17 PM   #10
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Cool websites, i was planning on getting most of my stuff from backwoods. Keep me posted on how the swap goes, I'm not planning on doing mine till next summer so it doesn't get in the way of school.
I will. I plan on doing it this winter.
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Old 09-07-2012, 05:11 PM   #11
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I will. I plan on doing it this winter.
I wish i had the time to do i this winter but there would be no way

What kind of setup are you going to go with? like axles and tires and junk?
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Old 09-07-2012, 06:01 PM   #12
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I will. I plan on doing it this winter.
I wish i had the time to do it sooner! But what setup are you going to run?
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Old 09-07-2012, 06:28 PM   #13
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Didn't mean to post that twice
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Old 09-07-2012, 07:19 PM   #14
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I wish i had the time to do i this winter but there would be no way

What kind of setup are you going to go with? like axles and tires and junk?
Because of the computer system in my Jeep and my wanting a 5.9 instead of a 5.2 I need to find a 2002 4x4 truck in order to get the rear sump oil pan and matching computer systems. I intend to buy a donor truck in order to get everything I need. I will run my stock axles for a while, yes I will need to be careful with the skinny pedal.
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Old 09-07-2012, 07:55 PM   #15
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Thanks! That's something i haven't heard, how could you counter that? Would louvers and a better radiator work? (please say louver, I've always wanted one but could never justify cutting a hole in a perfectly good hood)
I would start with the radiator and the cooling system in general. Figure out how big you can go.see what others our running. Then if you need it hood louver.
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Old 09-07-2012, 08:15 PM   #16
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Quote:
Originally Posted by Barrie

Because of the computer system in my Jeep and my wanting a 5.9 instead of a 5.2 I need to find a 2002 4x4 truck in order to get the rear sump oil pan and matching computer systems. I intend to buy a donor truck in order to get everything I need. I will run my stock axles for a while, yes I will need to be careful with the skinny pedal.
I don't know the details yet but i plan on buying a totaled vehicle with rear end damage for cheap, then selling what's left for parts.
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Old 09-07-2012, 08:20 PM   #17
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I would start with the radiator and the cooling system in general. Figure out how big you can go.see what others our running. Then if you need it hood louver.
Yeah I'm going to talk to backwoods about the cooling and still might do the louver as an excuse anyways. I really haven't found any first hand accounts of this swap though. Mostly all I've seen about the swap is flame wars on what is the best engine, not actual informative threads.
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Old 09-07-2012, 08:27 PM   #18
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Because of the computer system in my Jeep and my wanting a 5.9 instead of a 5.2 I need to find a 2002 4x4 truck in order to get the rear sump oil pan and matching computer systems. I intend to buy a donor truck in order to get everything I need. I will run my stock axles for a while, yes I will need to be careful with the skinny pedal.

Couldn't you take the axles out of the donor? Especially if you find a 4wd. You could use the whole setup. Just have the axles cut down
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Old 09-07-2012, 08:32 PM   #19
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Couldn't you take the axles out of the donor? Especially if you find a 4wd. You could use the whole setup. Just have the axles cut down
Yes I could and will most likely do so as $$$$$ allows.
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Old 09-07-2012, 08:33 PM   #20
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Yeah I'm going to talk to backwoods about the cooling and still might do the louver as an excuse anyways. I really haven't found any first hand accounts of this swap though. Mostly all I've seen about the swap is flame wars on what is the best engine, not actual informative threads.
Check out the Hot Wire site carefully, lots of goood info there.
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Old 09-07-2012, 10:00 PM   #21
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Check out the Hot Wire site carefully, lots of goood info there.
I looked through and saw the donor diagram and the harness wiring but I think I'm missing something here.
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Old 09-07-2012, 10:06 PM   #22
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I looked through and saw the donor diagram and the harness wiring but I think I'm missing something here.
I will look things up in the morning, and get you a rough list of what you will be looking at, and need.

I am not brushing you off, I have been up since 4:30 am. Bed time my friend.
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Old 09-08-2012, 12:04 AM   #23
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I will look things up in the morning, and get you a rough list of what you will be looking at, and need.

I am not brushing you off, I have been up since 4:30 am. Bed time my friend.
Not a problem, thanks for working with me on this so much!
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Old 09-08-2012, 07:44 AM   #24
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www.conversionradiators.com has great 3 and 4 core radiators and fan assemblies for any swap you wanna do. Great products and support at damn good prices too.
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Old 09-08-2012, 10:54 AM   #25
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ConversionRadiators.com Home Page has great 3 and 4 core radiators and fan assemblies for any swap you wanna do. Great products and support at damn good prices too.
Very nice site, and you weren't kidding about the prices. They're a third less than backwoods.

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