Who has a 5.9L swap and how do you like it? - JeepForum.com
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post #1 of 47 Old 12-15-2011, 07:12 AM Thread Starter
vtx531
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Who has a 5.9L swap and how do you like it?

I see a lot of threads about building these swaps but for those that have done it and lived with it for a few years - how is it?




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post #2 of 47 Old 12-15-2011, 09:16 AM
jptaylor2
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I love mine. It was an easy swap. it completely changes every dynamic of a tj, its not just a tj with a V8 it becomes an entirely different vehicle. What makes the difference is doing your homework before you start sourcing parts. Wiring was the hardest part and even its only about a 4 out of 10 difficulty. If you decide to take the plunge ask lots of questions 1st of those who've done it and use their experience to save yourself time and MONEY.

1998 TJ, 5.9/46rh swap,4.56, 8.8 arb, drag nasty bumpers,37" claws, poison spyder fenders & corners

2000 WJ LTD 4.7, 242 swap, 4" lift, JK Moabs/BFGs

2008 Grand Cherokee SRT8
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post #3 of 47 Old 12-15-2011, 10:34 AM
the_art_of_desi
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Im interested in reviews as well.. Next fall will see the start of my swap..

One question: Cooling while crawling.. Aluminum rad and E-fan? Does it overheat..

1997 TJ SE - Emeral Green Pearl
2.5L : AX-5 : NP231, D30HP : D44 : 4:88 : Front Aussie
2.5" OME lift, OME LT shocks, 2" BL, Currie Control Arms, Currie HD Steering, Currie Trackbars, Warn M8000
Custom Front and Rear Bumpers, Custom Rock Sliders, OBA
33" x 12.5" x 15" Goodyear MTRs, Black Steelies
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post #4 of 47 Old 12-15-2011, 11:45 AM Thread Starter
vtx531
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Quote:
Originally Posted by jptaylor2 View Post
I love mine. It was an easy swap. it completely changes every dynamic of a tj, its not just a tj with a V8 it becomes an entirely different vehicle. What makes the difference is doing your homework before you start sourcing parts. Wiring was the hardest part and even its only about a 4 out of 10 difficulty. If you decide to take the plunge ask lots of questions 1st of those who've done it and use their experience to save yourself time and MONEY.
How's the gas mileage?



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post #5 of 47 Old 12-15-2011, 11:56 AM
jptaylor2
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I play in the mud in south ga-high rpm and hot temp in summer. I run an ebay conversion rad with e-fan only and mine never tops 200. Making sure you have complete shroud coverage of rad is of HIGHEST importance.

As for mpg-ive got 37s 4.88s and a 46rh auto-as for mileage I get around 13 around town but on the 2 long highway trips I've made I got right at 21mpg. I've spoken with others who had different #s but tires gears and tranny combo makes a HUGE difference

1998 TJ, 5.9/46rh swap,4.56, 8.8 arb, drag nasty bumpers,37" claws, poison spyder fenders & corners

2000 WJ LTD 4.7, 242 swap, 4" lift, JK Moabs/BFGs

2008 Grand Cherokee SRT8
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post #6 of 47 Old 12-15-2011, 01:03 PM
the_art_of_desi
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Any engine mods on your Jeep? How does it feel with the 37s, 4:88 gears and auto trans?

1997 TJ SE - Emeral Green Pearl
2.5L : AX-5 : NP231, D30HP : D44 : 4:88 : Front Aussie
2.5" OME lift, OME LT shocks, 2" BL, Currie Control Arms, Currie HD Steering, Currie Trackbars, Warn M8000
Custom Front and Rear Bumpers, Custom Rock Sliders, OBA
33" x 12.5" x 15" Goodyear MTRs, Black Steelies
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post #7 of 47 Old 12-15-2011, 01:09 PM
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Quote:
Originally Posted by jptaylor2 View Post
... but on the 2 long highway trips I've made I got right at 21mpg.
That is almost unbelievable.

The 5.9 can't pull that MPG in other vehicles that are more aerodynamic.

My TJ has a supposedly more fuel efficient motor than the 5.9 and I can't get anywhere near 21 on the highway.
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post #8 of 47 Old 12-15-2011, 08:32 PM
jptaylor2
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i honestly have NO idea how but i do know that both trips were the same, home to Panama City and on both trips the mileage was about 20.7mpg....that was not including all of the riding i did when i got there or back, just the trips down, ie, i filled up before leaving home then filled up when i got to PC so litterally about 98% of that mileage is 65/70mph highway. if i were to put an all around mpg on what it does overall its prolly somewhere about 16ish. as for the drivetrain combo i love it, but its also suited to what i do which is deep mud and logging trails...if i had rock or more technical stuff i think id rather have 5.13s as the OD helps to make up for the steep gearing on the top end.

1998 TJ, 5.9/46rh swap,4.56, 8.8 arb, drag nasty bumpers,37" claws, poison spyder fenders & corners

2000 WJ LTD 4.7, 242 swap, 4" lift, JK Moabs/BFGs

2008 Grand Cherokee SRT8
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post #9 of 47 Old 12-15-2011, 08:56 PM
Madeoflite
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I have a 5.2 and I'm only getting 13 mpg ish if I'm lucky. It's one of the best mods i've done
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post #10 of 47 Old 12-15-2011, 10:01 PM
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I have the 5.2 and get 21 to 23 depending..... I have 4:10s and 32s. I still run the stock rad. In the desert this summer at 115 F never overheated.....

2014 Wrangler Sport S 2 dr
1997 TJ, 5.2 Magnum V8, 46RE, NP231, 4:10's.....

I hear voices.
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post #11 of 47 Old 12-15-2011, 10:58 PM
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Originally Posted by sheriff1680 View Post
I have the 5.2 and get 21 to 23 depending..... I have 4:10s and 32s. I still run the stock rad. In the desert this summer at 115 F never overheated.....
What speed do you drive at?

I must use the skinny pedal too much.
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post #12 of 47 Old 12-16-2011, 12:15 AM
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Re 5.9 gas mileage.
I sold my '98 5.9 but I regularly got over 20mpg on the highway. Completely stock. It got better mileage than my '05 Rubi.

We regularly drove Yellowknife NWT to Edmonton AB. 950 miles. Usually under 13 hours and still over 20mpg.
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post #13 of 47 Old 12-16-2011, 11:56 AM
REDLYNER
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What is the end all be all cost for this swap? Can it be done for $4k with decent parts and a clean engine?

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post #14 of 47 Old 12-16-2011, 12:18 PM
pcoplin
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I am getting around 11 mpg with my 5.9/46RE. I get around 8 while wheeling in low range.

I have a friend that gets 14 with his 5.2/44RE in his TJ, and another friend gets 16 on the highway with his 5.2/AX15 in his YJ. The 5.2 in my Ram gets 16 on the highway. But the power of my 5.9 is considerably more than all three. It really rips and the extra torque down low is fantastic on the trail. It gets slippery around here.


I wish I would have done with an LS or Hemi swap to get better mileage, but the Magnum swaps are much cheaper and easier. I spent $2500 and that included an engine rebuild, $700 for the harness work, and a $700 Stak case.

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post #15 of 47 Old 12-16-2011, 02:47 PM Thread Starter
vtx531
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Interesting reports from those getting 20+ MPG considering a 4.0 Grand Cherokee gets 14/19 and the 5.9 Cherokee gets 11/16.

I guess I will wait until I retire it as my daily driver. I got it new at age 16 in 2002 and it's still my DD.



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