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Old 04-18-2014, 10:36 PM   #1
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CUMMINS 4BT pictures.

Just finished my 4bt swap a week ago.been working on this project since thanksgiving. Thought I'd share the build on the forum. Here are just a few pictures from beginning to end. And also a short list of the major upgrades:

Cummins 4bt turbo diesel

Ax-15

Zone 4.25 combo lift

33 Federal mud tires

Smitty bilt Roof rack

Rhino lined everything

Let me know what you guys think!
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Old 04-18-2014, 11:10 PM   #2
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i like it man looks good. have you had it out on her maiden voyage yet if so how does it pull

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Old 04-19-2014, 12:42 AM   #3
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wish i had the skills for this...definitely the motor i want
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Old 04-19-2014, 02:56 PM   #4
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The torque is unreal. Plus the gas Mileage. Perfect combo for a jeep. I've put about two hundred miles on it so far and have had zero problems.
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Old 04-19-2014, 03:22 PM   #5
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If you feel like coming to Denver and doing the swap for me, i wouldnt mind...

definitely jealous
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Old 04-19-2014, 04:00 PM   #6
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If you don't mind me asking, about what did this swap cost from start to finish?
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Old 04-19-2014, 04:24 PM   #7
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I looked at getting a jeep to do a 4bt swap, what I thougt was odd is you can get a 6bt or 24v cheaper than a 4bt.
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Old 04-19-2014, 06:04 PM   #8
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I found the motor out of a recently rebuilt bread truck. And going the 4bt route everything fit well and smooth. If I had to make a rough guess. I'd say it was around five grand with lift included. But all the work was done privately.
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Old 04-19-2014, 07:30 PM   #9
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I found the motor out of a recently rebuilt bread truck. And going the 4bt route everything fit well and smooth. If I had to make a rough guess. I'd say it was around five grand with lift included. But all the work was done privately.
That's not bad I'd do the swap myself if I was gonna, I do fabrication and powersports repair.
I just hate the fact the 4 is more than the 6. A wrangler would never hold a 6 without some serious mods it is a 4bt and a half plus the torque would probably tear those small danas apart.
Nice work tho.
What did you put behind it for a trans?
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Old 04-19-2014, 07:43 PM   #10
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How about you're axles? Did you have to throw Some Bigger ones under it?
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Old 04-19-2014, 09:31 PM   #11
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I just used an ax-15 trans. And I am currently running stock axels. But I plan to swap those out later on. For just highway use they are fine. I wouldn't want to do anything serious as it is now though. Drive shafts need to be upgraded soon also. Here's another picture taken today.
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Old 04-20-2014, 07:41 AM   #12
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It's a joke to call it a little 4 cylinder. The 4BT is huge! As I understand doesn't that engine have some impressive numbers along with gas milage?

Cool build by the way!
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Old 04-20-2014, 11:01 AM   #13
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So fricken jealous! This would be my dream! So if it cost you roughy $5000, any estimate on what it might cost me to have a shop do the work? I have 0 knowledge of engines or any of that. I'm just so curious about this swap
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Old 04-20-2014, 11:44 PM   #14
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As far as gas mileage. I'm getting 20 right now. Which is awesome for a lifted jeep. After I re gear should get around 25 or so. There is literally not a hill 5th won't pull. And I have no clue about getting a shop to do it. I know jdjeeps does it. And I know bruiser conversions does it. But I'm sure the price is very very High. Tons of custom work and unique pieces needed. Plus a lot of hours.
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Old 04-21-2014, 06:58 AM   #15
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I've heard also that you need to beef up the frame when you go to the 4BT. Is that true? If so, that's going to suck

Bruiser conversions has some pretty sweet builds but like you said, not only are you paying for their handy work but for the name as well
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Old 04-21-2014, 10:20 AM   #16
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I did not do anything to the frame. And I do not see where it would need it. The jeep is light enough that the whole thing can flex under pressure and the frame is not under a lot of stress.
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Old 04-21-2014, 12:04 PM   #17
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I did not do anything to the frame. And I do not see where it would need it. The jeep is light enough that the whole thing can flex under pressure and the frame is not under a lot of stress.
Well I've only heard that you need to which is why i asked if it was true. I can't see it being a problem.
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Old 04-21-2014, 12:17 PM   #18
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Post a video of that sucker! I want to hear how it sounds!!
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Old 04-24-2014, 01:12 PM   #19
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Awesome jeep man, your my hero! Would a non turbo 4b be worth the swap in your opinion? I have access to a free one out of a old case skid steer. This has been a dream of mine for a long time, such a reliable strong motor it's not even funny. Always starts right up even when the weather is in the single digits, it's logged over 9k hours and still going strong, the rest of the machine not so much.
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Old 04-26-2014, 02:53 PM   #20
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Thanks. I do think it could be worth it even without the turbo. But I know if I was going to put in the time and money Into it. I would go ahead and add the turbo. I've only heard of one guy who did it without the turbo. But from what I heard he was still happy with it.
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Old 04-27-2014, 06:11 PM   #21
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This is what I want to do to my YJ but I'd need a new JK 6-speed to replace the original 5-speed and also a new transfer case, driveshaft, and diffs to handle the massive torque output.
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Old 04-28-2014, 07:59 PM   #22
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You can really do without upgrading all of the driveline as long as you are not gonna wheel it hard. I plan to build up the drive line little bits at a time but for now everything works fine.
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Old 04-29-2014, 06:07 AM   #23
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How hard was this install
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Old 04-29-2014, 11:10 AM   #24
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Pretty hard. Not so much the labor. But lots of fabrication getting it all just right. It was was a five month process for me.
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Old 04-29-2014, 11:11 AM   #25
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Now it was five months for me. But I'm a senior in high school and am also attending college classes. So I have a busy schedule.
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Old 04-29-2014, 11:35 AM   #26
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Now it was five months for me. But I'm a senior in high school and am also attending college classes. So I have a busy schedule.
That's a whole new level of respect for you man. Awesome job.
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Old 04-30-2014, 09:51 AM   #27
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Thanks. It's the second vehicle I've rebuilt. It's been fun.
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Old 04-30-2014, 12:30 PM   #28
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You can really do without upgrading all of the driveline as long as you are not gonna wheel it hard. I plan to build up the drive line little bits at a time but for now everything works fine.
Haha of course I'd drive it hard, I'd be pushing it to the limit on rocks and crap.
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Old 05-04-2014, 12:14 AM   #29
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Awesome job!
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Old 05-05-2014, 09:21 AM   #30
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Looks Great! Good Work

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Jeep 1: 93 YJ, TBI Chevy 350, SM 465, NP 231 SS SYE, 3.5" BDS, 33" BFG AT, 0 rust. Sold due to College.... Jeep2: 91 YJ, 4BT Cummins TD, NV4500, NP 231 SS SYE, 2.5" OME, many mods in progress. DD: 2001 Cummins 24v ext. Cab short bed, NV4500 5spd.

ASK ME ABOUT MY CUMMINS 4BT MOTOR MOUNTS!!!
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