Diesel Cummins 4BT TJ - Page 11 - JeepForum.com

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post #151 of 175 Old 02-28-2011, 08:27 PM
CMOfoSHO
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Im droolin right now!!!!!

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post #152 of 175 Old 03-01-2011, 07:56 PM
redjeep1992
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hey man this is an awesome build i have been looking at diesel build to see which one will fit best when my 2.5L craps out and this looks like a match

2004 Jeep TJ Rubicon- 2"BB with 32" tires- 2nd jeep (current)
1999 jeep TJ SE-1st Jeep. Sold but not forgotten
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post #153 of 175 Old 03-01-2011, 09:56 PM
Ggg
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I have been very happy with my own TJ/4bt. I will say because you have a 2.5l your trans will be too weak for a 4bt. I used my stock AX15/231 and so far so good. There is a lot of info on the 4btswaps site, several of us have done Jeep/4bt swaps and have lengthy build threads.
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post #154 of 175 Old 03-01-2011, 10:03 PM
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ok first i apologize for being lazy i looked throught the first four pages of the thread and awsome jeep but my question is how is highway driving what type of speed can you maintain and what type of acceleration does the 4bt have? thanks in advance once i get a dd im going to be doing a swap and this is an option

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post #155 of 175 Old 03-01-2011, 10:11 PM
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i must say, this build turned out awesome, love the paint and the swap and i am SUPER jealous cause i've wanted to do this swap for months but haven't had anywhere near the money and/or time to do it. major props to you my friend, hope it's working out awesome for ya

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post #156 of 175 Old 03-01-2011, 10:30 PM
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Quote:
Originally Posted by Mudmouse990
how is highway driving what type of speed can you maintain and what type of acceleration does the 4bt have?
That's going to depend quite a lot on tire size, gearing, and to some extent weight, don't you think?
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post #157 of 175 Old 03-01-2011, 11:40 PM
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They will maintain 70 mph with proper gearing and overdrive, I believe mine will top out at about 60-65 due to rpm not lack of power. Economy depends a lot of the condition of the engine, gearing, weight, etc. I have no idea what mine gets for mpg because it is too high to be street legal, I built it for the trails. But I have gone out winter wheeling 5 times (full day trips) so far and have only used about 4 gallons total.
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post #158 of 175 Old 03-02-2011, 07:14 PM
redjeep1992
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Quote:
Originally Posted by Ggg View Post
I have been very happy with my own TJ/4bt. I will say because you have a 2.5l your trans will be too weak for a 4bt. I used my stock AX15/231 and so far so good. There is a lot of info on the 4btswaps site, several of us have done Jeep/4bt swaps and have lengthy build threads.
i have read this thread i know if i put that engine with everything that i have stock it will blow up if i do this what i plan to have dana 44 front and rear 4.56 gears ax-15/231 combo so

2004 Jeep TJ Rubicon- 2"BB with 32" tires- 2nd jeep (current)
1999 jeep TJ SE-1st Jeep. Sold but not forgotten
1991 nissan axxess-First vehicle RIP
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post #159 of 175 Old 03-02-2011, 10:21 PM
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To me that sounds like a good combination, If you can get a better rear like a 8.8 or better yet a 9" I would. Just don't use the junk Rubi D44 front axle, use a true D44 out of a Ford to keep left side pinion, and get high pinion as a bonus. I am running a D60 front and a Sterling 10.25 rear axle but I also have big tires. Speaking of which what size tire are you running with a 4.56 gear? That is a good gear for about a 44" tire.
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post #160 of 175 Old 03-03-2011, 12:18 PM
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i was hoping to use like a 33 or 35 inch tire with a 4 inch life with MML and BL so i guess a 4.10 maybe a better gear ratio but this is an after college build so hopefully i will have more info about this

2004 Jeep TJ Rubicon- 2"BB with 32" tires- 2nd jeep (current)
1999 jeep TJ SE-1st Jeep. Sold but not forgotten
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post #161 of 175 Old 03-03-2011, 01:48 PM
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For 33" tires you will want to run 3.54, and for 35" tires a 3.73 would be best with a 5 speed trans and 65mph highway.
You want your highway RPM to be between 1800-1900 for best fuel economy.
A 4" lift and 1.5" BL is a lot of lift for that size of a tire. I didn't need any BL for mine to fit, I trimmed the pinch welds a little where the floor meets the firewall. As far as MML goes don't even worry about it. You will need custom engine mounts and the stock brackets will get cut off the frame to make room for what needs to be fabricated.
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post #162 of 175 Old 03-03-2011, 07:57 PM
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Quote:
Originally Posted by Ggg View Post
For 33" tires you will want to run 3.54, and for 35" tires a 3.73 would be best with a 5 speed trans and 65mph highway.
You want your highway RPM to be between 1800-1900 for best fuel economy.
A 4" lift and 1.5" BL is a lot of lift for that size of a tire. I didn't need any BL for mine to fit, I trimmed the pinch welds a little where the floor meets the firewall. As far as MML goes don't even worry about it. You will need custom engine mounts and the stock brackets will get cut off the frame to make room for what needs to be fabricated.
thanks this is really helping me this is a build that I am interested in but i hope to do this after college and after i find a little DD while i work on the jeep so the only thing that I am really worried about is the wiring I should be able to do everything else hopefully lol

2004 Jeep TJ Rubicon- 2"BB with 32" tires- 2nd jeep (current)
1999 jeep TJ SE-1st Jeep. Sold but not forgotten
1991 nissan axxess-First vehicle RIP
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post #163 of 175 Old 04-11-2011, 05:14 PM
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I am looking into this swap and I was curious as to your transmission choice. Does the NSG has to lower top gear (numerically speaking)? The adapter from Novak is almost $300 and I have seen diesel NV4500's for about the same price. Since the diesel NV4500 was bolted up to the 6bt, wouldn't I be able to bolt it up to the 6bt? I believe the transfer case splines are different but I could either swap that out or go with a np241 (haven't gotten that far into that aspect of it yet)and (famous last words) it shouldn't be too much harder or a swap with a stronger trans, right?

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post #164 of 175 Old 04-11-2011, 05:15 PM
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I meant a better overdrive ratio, just to clarify.

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post #165 of 175 Old 04-11-2011, 05:29 PM
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The NSG370 has a 0.84 OD ratio, the AX-15 had a 0.74 OD ratio, and the NV4500 has a 0.73 OD ratio.
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