Cummins swap TJ - Jeep Wrangler Forum

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Old 10-30-2013, 08:19 PM   #1
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Cummins swap TJ

I have a 1998 wrangler 5 speed 2.5. 2 months after buying it the motor starts smoking and hardly runs. I now have decided to do a 4bt swap with a nv4500, np241, and 8.8 axles. I also have been reading about needing a 4in long arm lift and maybe even a small body lift for the transfer case to fit. I plan on using the stock gages, doing the fuel tank mods, and using hydraulic motor mounts. My motor is coming with the adapter for the transmission already and transfer case should bolt right up. Obviously a lot of plumbing is going to need to be done. My question is what am I forgetting?

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Old 10-31-2013, 09:35 PM   #2
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Bigger radiator haha. That is ask I can think of at the moment

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Old 11-01-2013, 11:39 AM   #3
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Quote:
Originally Posted by Goingcummins View Post
I have a 1998 wrangler 5 speed 2.5. 2 months after buying it the motor starts smoking and hardly runs. I now have decided to do a 4bt swap with a nv4500, np241, and 8.8 axles. I also have been reading about needing a 4in long arm lift and maybe even a small body lift for the transfer case to fit. I plan on using the stock gages, doing the fuel tank mods, and using hydraulic motor mounts. My motor is coming with the adapter for the transmission already and transfer case should bolt right up. Obviously a lot of plumbing is going to need to be done. My question is what am I forgetting?
Don't forget the fact that engine will make your suspension squat about 2 inches due to the weight difference. Also you will need a different hood to clear the intercooler tubes. (At least with a yj but I don't think the tj hood is much different in dimensions). There was an article in diesel power talking about everything you needed to do for this swap (a while ago)
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Old 11-02-2013, 01:28 PM   #4
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I am actually starting the same exact thing with the same jeep! Let me know if you find anything major we might could help each other.
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Old 11-05-2013, 09:31 PM   #5
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Started on the disassembly.

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Old 11-06-2013, 11:43 AM   #6
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I the engine I got doesn't have a intercooler. But I am almost sold on the Rubicon tri-link express 5.5 lift. Does anyone have opinions on this or equivalent options?
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Old 11-06-2013, 02:32 PM   #7
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all I can add is to help handle the extra weight up front alot of guys swap out '79 Bronco/F-100/150/250 coils due to the much higher spring rates. I want to say TJ coils are around 150lbs at the highest and Bronco coils are around 300-330lbs so it'll help control the weight and keep your rig level. good luck on the build and keep us updated:thumbs:
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Old 11-06-2013, 09:05 PM   #8
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And the body is detached!

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Old 12-08-2013, 12:37 PM   #9
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Has the build stopped
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98 TJ 4.0l/K&n Cold air/Flowmaster/R Ford 8.8 w/Ox Air Locker Yukon 4.88/F Dana 30 w/ Aussie Locker Yukon 4.88/10k winch/jks disconnects/4in mismatch lift/ rancho shocks/33in tires on steelies
Build Thread
http://www.wranglerforum.com/f322/li...ad-397338.html
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Old 02-18-2014, 06:59 PM   #10
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you could probe get away with zj coils. it's the v8 so it should support the weight

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