Cummins 4BT diesel / TH400 swap - JeepForum.com
 
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post #1 of 13 Old 02-13-2008, 09:43 PM Thread Starter
thegrimlinyj
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Cummins 4BT diesel / TH400 swap

I have been thinking of this kind of swap. The 4BT is 5lbs lighter then the 350 Chevy so I think I will be good there. What I kinda need to know is why I see other people use the stock jeep np231 with an adapter and SYE over a gear driven 205 that came stock with the TH400 4x4?

Also would a stock D30 front end take the 348 foot pound of torque @ 1700 rpm's that this little critter can put out for a little while till I can save up funds for upgraded parts?

Thanks Starr

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post #2 of 13 Old 02-13-2008, 10:54 PM
djcondo
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for the front axle it depends on how you use it. if u beat on it and floor it in 4WD yeah u will prob break something. ur putting a more weight on the already stock weak front end and then putting an awsome amount of torque to it. if u fenesse it, it should be fine

- Dan
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post #3 of 13 Old 02-14-2008, 06:58 AM
Whitey2001
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Quote:
Originally Posted by thegrimlinyj View Post
I have been thinking of this kind of swap. The 4BT is 5lbs lighter then the 350 Chevy so I think I will be good there. What I kinda need to know is why I see other people use the stock jeep np231 with an adapter and SYE over a gear driven 205 that came stock with the TH400 4x4?

Also would a stock D30 front end take the 348 foot pound of torque @ 1700 rpm's that this little critter can put out for a little while till I can save up funds for upgraded parts?

Thanks Starr
I've got a buddy that is putting a 6BT in his '79 FS Bronco. He is adamant about leaving his 205 in. I personally have not used them, but he swears by it. He is a former Marine and takes pride in the fact that his main goal while in was seeing how much crap he could break. They told him he couldn't flip a Humvee, well they were wrong. He still hasn't junked his 205.

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post #4 of 13 Old 02-14-2008, 08:23 AM
StreetbikeDepot
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The 4bt only wieghs @150lbs more than the 4.0........if my 4.0 ever goes down, I'm swapping it for a 4bt as well.
Check out 4btswaps.com
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post #5 of 13 Old 02-14-2008, 09:09 AM
1 ton yj
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The 4BT is a 4 cyl version of the 6BT which is the 5.9 Cummins diesel that comes in the dodge pickups.

The problem with swapping a 4BT is that they are very tall from the bottom of the pan to the top of the valve cover. No to say that it can't be done, but the dimensions of the motor do present a challenge when mounting in a Jeep.

On the other hand, the bellhousing part of the block is removeable. This was done so the same engine could be used in a variety of vehicles by only changing the bellhousing plate on the back of the block. And yes some 4BTs came with plates that have a Chevy bolt pattern
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post #6 of 13 Old 12-08-2011, 08:36 PM
Jpayne00
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Quote:
Originally Posted by 1 ton yj View Post
The 4BT is a 4 cyl version of the 6BT which is the 5.9 Cummins diesel that comes in the dodge pickups.

The problem with swapping a 4BT is that they are very tall from the bottom of the pan to the top of the valve cover. No to say that it can't be done, but the dimensions of the motor do present a challenge when mounting in a Jeep.

On the other hand, the bellhousing part of the block is removeable. This was done so the same engine could be used in a variety of vehicles by only changing the bellhousing plate on the back of the block. And yes some 4BTs came with plates that have a Chevy bolt pattern
I heard that you have to have a 4" lift for the 4bt to clear
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post #7 of 13 Old 12-08-2011, 08:36 PM
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I'm also looking in to this
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post #8 of 13 Old 12-08-2011, 08:52 PM
oldtime_ironman
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Quote:
Originally Posted by thegrimlinyj View Post
I have been thinking of this kind of swap. The 4BT is 5lbs lighter then the 350 Chevy so I think I will be good there. What I kinda need to know is why I see other people use the stock jeep np231 with an adapter and SYE over a gear driven 205 that came stock with the TH400 4x4?

Also would a stock D30 front end take the 348 foot pound of torque @ 1700 rpm's that this little critter can put out for a little while till I can save up funds for upgraded parts?

Thanks Starr
Its easier to find a chevy 205 instead of a ford 205 far as I know. You would need a ford style 205 to work in a YJ unless you want to swap front axles. I love the 205 myself, I've never seen anyone break one even if they tried. I have seen the 205 installed on Mack trucks at work, too... that should tell you something.
.
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post #9 of 13 Old 12-09-2011, 05:18 AM
twiisted71
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The 3.9L/4BT Cummins engine had a wet weight of 745 pounds (338 kg).

Wet small block is #575 with iron intake. So who ever told you a 4BT only weighs 5 pounds more than a 350 GM was a little off.
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post #10 of 13 Old 12-09-2011, 05:44 AM
jason m
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I pulled this TH-475 bolted to a 6BT from a package truck. The TH-475 is the stronger couson of the TH-400, its just a overall heavyer duty trans. Insteed of a 205 try a 241, the HD version of a 231. It will have a better low range over the 205 and will take the abuse better than the 231.
They came in two flavors 27 and 32 spline, they where even bolted to a TH-400 and can be found in pass and driver drop.

TH-475 with a one piece Alu pan and front cover. Extra ribbing and a thick tail flange. Sorry only Pic I have of it.


TH-400 driver drop 241, notice the 69# on the bell medium thick bell but a thick tail housing.


TH-400 with a 203 bolted to it. Thick front bell section, but a meduim tail and the #12 stamped on the bell.

Look for a number 28 case, they are the thick bells and thick tails section. Make's a big difference in strentgh and weaght you can hang on the tail.

Jason.

1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

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post #11 of 13 Old 12-09-2011, 07:31 AM
Spuznick242
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Time to carry this over to the 4bt swap thread.

DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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post #12 of 13 Old 12-09-2011, 07:55 AM
youngjeeper11
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Start Reading! I did this swap early this year, I have also done a chevy 350, and a chevy 5.3. This is by far my favorite engine.

The chevy V8s are awesome, but they made the jeep feel more like a race car, which is fine and I loved it, but the 4BT makes it feel more like...just a torque monster Jeep ready to crawl up anything, and still throws you back in your seat when you tromp on it, and I havn't even done any engine mods.

I do not know where everyone gets their numbers... a 4BT is about 700-745lbs (thanks twisted), and will definietly push your front end down more than a Chevy 350, but shackles are an easy fix, and lift springs are better.

stock a 4bt only puts out around 120 hp, and 220ish ft-lbs of torque, I know because it is stamped on the side of my 4bt. However, with only a couple hundred buck in easy mods, you can easily get into the 2-300 hp range, and 3-400 ft-lbs range, all depends.

I got my 4BT to fit with plenty of room with a 1" body lift, and 2.5" lift, I bet you could do it with just 3" of lift.

wiring is a piece of cake

just check out my thread!

also, Im already in trouble for advertising, so if you are serious about this and might want info on motor mounts, PM me.

heres my build thread

https://www.jeepforum.com/forum/f12/4...-pics-1275843/

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #13 of 13 Old 04-26-2019, 09:50 AM
troytag
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where can I find me a T-400 pan like that ?
I need it 1 piece pan/ inspection cover
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