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Old 12-12-2011, 08:48 AM
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4cyl cummins jeep

well i know this is the powerstroke site, but i refuse to go to the cummins forum. last time i asked those guys a question all i got was a bunch of a** holes telling me off.

me and a couple buddies are building a cummins jeep and have run in to a few snags. first the motor sits way far back against the fire wall and it doesent appear we are going to have room for the down pipe. would any body suggest cutting the fire wall to squeeze it in or is that a bad idea?
second when we have the motor in the frame with the motor mounts we made the oil pan will deffinatly hit the front diff. its just a fin off to the side behind the pumpkin. i know we will be doing the spring over axle conversion but i am still woried that it will touch with any kind of articulation. can we notch out the fins on the back of the diff to make it work or will we be sacrificing the integrety of the axle? i understand that we will be needing stronger axles but we will be using the stock ones untill they break. so next question what axles would be good to replace them with?
we are working on figuring out what to do with a crossmember for the tranny and i assume were going to need a seperate one for the t-case rite?

we will be doing some mods to the motor to make it a little faster and what not. i know verry little about the cummins what performance mods can be done. it is a 1998 4bt cummins with a 4 speed tranny out of a bread truck.
any advice will be appreaciated. thanks in advance
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Old 12-12-2011, 09:16 AM
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Cutting the fire wall is very common and is not frowned upon when doing engine swaps. I would not worry about that. As fars as the oil pan, once the spring over is done you should be just fine. Might want to throw a couple more inches of lift on it just for piece of mind. I dont know a lot about Jeeps but most vehicles just have one cross member that connects between the trans and T-case.
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Old 12-12-2011, 09:23 AM
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yeah it only had one cross member on it before. but the tranny that came on the cummins it significantly shorter and i dont think the factory one will mount up properly. we havent gotten that far yet but im just looking ahead acouple days. have a plan befroe hand.
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Old 12-12-2011, 09:23 AM
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subscribed... i want to do this with a toyota truck
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Old 12-12-2011, 09:30 AM
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Can you just cut out the original cross member and cut the new one to fit or fab up the jeeps one to work?
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Old 12-12-2011, 09:39 AM
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that is probably what we will have to do just make a new one we havent really gotten to the tranny yet so idk if we will be able to modify the factory one to work or not

i only have a few pics not great but enuff to get the idea


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Old 12-12-2011, 09:40 AM
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you can see how close the turbo is to the fire wall in the first 2. and the 3rd you can see the motor mount we made and how close the oil pan is to the diff.
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Old 12-12-2011, 10:13 AM
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this is only a weekends project so progress will be slow, but we seem to work pretty quikly when we have a set plan so any advice is appreciated. has any one elts some thing like this? i know its much diffrent than making a fummins but im sure people who have done that would have some good ideas.
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Old 12-12-2011, 03:50 PM
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bump... no body has any more sugestions, ideas, thaughts?
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Old 12-12-2011, 04:21 PM
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I love the idea of a 4BT Jeep! If you are going to ditch the factory heater box I say cut the firewall and re-make it with sheet metal. For some real ghetto-fab if you are in a cold climate, run the exhaust pipe through the firewall for your heat.

The YJ you are working with is fairly basic, how about stretching the nose to get the engine out of the firewall? A little more wheel base would be good for the Jeep anyway. Add 10 or 12 inches to the frame, build some flat fenders out of 1/8" plate and fab up the hood to fit. I think the hood would be the difficult part. Your center of gravity would suffer but with the longer nose you could raise the engine and trans up to get out of the axle. This is going to kill your driveshaft angles when you lift it.

I say ditch the factory skid plate and build a cross member that bolts in between the frame rails. I've never seen a 4X4 bread truck so I assume you are going to either swap out the trans or run a divorced Xfer case. If you go the divorced route you will need another cross member for it.

Another option would be to Baja the thing and mount the radiator on the roll bar/cage with an electric fan and move the engine forward to the grill. You can also raise it up and either run no hood or make a giant cowl hood for it.

Score a couple of full width 1 ton axles when it is time to swap. You may be surprised how well the tiny Dana 30/35 holds up if you are easy on the throttle.

I've burnt out on my Jeep, it has been nearly a year since I've turned the key on it. Your post got me excited again, thanks. I'm full of opinions, just ask me.

Good call on posting your Cummins in a Jeep swap on the Powerstroke forum, I think the guys on the other forums like boys anyway. They wouldn't get it.
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