[Jtm35a2]

Does anyone make stock or under 4” lift height coil springs to withstand the weight of a 1100 pound engine plus the usual bumper/winch etc…? I don’t want to build a $5k coil over system for a jeep that will rarely leave the pavement.

 

[rockystock]

What engine are you swapping in? A Peterbilt?

 

[Jtm35a2]

6bt

 

[snout]

I vote for a build thread.

 

[Jtm35a2]

It’s coming, but wanted to weed out some of the basics, so as to not present a wishy washy plan/post. I am wanting, for no better way to say it, a pavement princess with some power. I am debating between the artec axle truss setups for the ford axles, or just leaf springing it. I don’t need flex or rti numbers, just a 4 door cruiser that can go off road a little. No interest in high $ coil over suspension builds. If I can’t readily find a high capacity coil spring, it will be leaf sprung. The leaves might add to towing capacity better anyway, if done correctly with a little frame reinforcement.

 

[White Elemant]

Holy crap, I checked the weight, cummins will be ~half a ton, about three times heavier than the original engine 😳

You do you, but for a pavement princess I'd go for a gasoline engine, just for the performance advantage. Diesel will have a narrow rpm band. And, say, 392 Hemi weighs half what the 6bt does...

 

[coilrod]

I vote for a build thread.

I vote project for sale by September. This was a question that shouldn't have been asked by a 6bt swap self performer.

 

[Jtm35a2]

I vote project for sale by September. This was a question that shouldn't have been asked by a 6bt swap self performer.

Jokes on you smartass. I haven’t even bought a jeep yet, so probably won’t find it, screw it up, and then decide to sell it buy September. What I do have is a 40,000 mile p pump cummins crate motor and a love for jeeps. Appreciate your very insightful input though.

 

[coilrod]

Jokes on you smartass. I haven’t even bought a jeep yet, so probably won’t find it, screw it up, and then decide to sell it buy September. What I do have is a 40,000 mile p pump cummins crate motor and a love for jeeps. Appreciate your very insightful input though.

Ya, ya. I hope you do a conversion, and it works. There have been a few who have tried, one or two that got it working. For all I know you are a mechanical genius and can cut out your firewall, re-position your seats, strengthen your frame, install appropriate axles and braking system, and then make the JK speak to the 6BT and whatever transmission you squeezed in.
My insight is that for a mostly street wagon, this is the wrong way to go.
That said, it's your engine and if you want to fab up a frame and fit a JK body on it, then I'll be extremely impressed.

 

[Jtm35a2]

Ya, ya. I hope you do a conversion, and it works. There have been a few who have tried, one or two that got it working. For all I know you are a mechanical genius and can cut out your firewall, re-position your seats, strengthen your frame, install appropriate axles and braking system, and then make the JK speak to the 6BT and whatever transmission you squeezed in.
My insight is that for a mostly street wagon, this is the wrong way to go.
That said, it's your engine and if you want to fab up a frame and fit a JK body on it, then I'll be extremely impressed.

In my hours of pre plan researching, I stumbled upon a likely direction. Google “rowdy rubi”. Now the question becomes what has a longer engine compartment, Tj or Jk ? Or same?

 

[coilrod]

In my hours of pre plan researching, I stumbled upon a likely direction. Google “rowdy rubi”. Now the question becomes what has a longer engine compartment, Tj or Jk ? Or same?

The 4 liter is 10 +/- inches longer than the 3.8. I can't measure either engine bay, but my xj had miles more room than my jk.
You will be cutting out the firewall. Don't know how the steering linkages will fit.

 

[Jtm35a2]

Watch his walk around video. No cutting on the tj. I might need to look in that direction.

 

[coilrod]

Watch his walk around video. No cutting on the tj. I might need to look in that direction.

It's about 8" longer than a 4 l. Or 18" longer than a 3.8.
You can make it fit right in the JK bay, I'm sure.
There are a couple guys here who are experienced in the 6 and 4bt swaps. I'm not one of them.
I don’t see it fitting, but then again, I've never tried. Thing is, you ask questions about coils and electrical, which is good, but there are other answers you need first, and hopefully one of the smarter guys here can point you in the right direction.

 

[Jtm35a2]

I am pretty much resigned to losing the electrical, especially on a jk with the whole tipm deal. If there are no coil springs available for that kind of weight, which I think there probably isn’t, it will be leaf sprung.

 

[coilrod]

I am pretty much resigned to losing the electrical, especially on a jk with the whole tipm deal. If there are no coil springs available for that kind of weight, which I think there probably isn’t, it will be leaf sprung.

So you said. I think you need a truck. Squeek a JK body on it. Hot rod the gauges and add Vintage air.
Best of luck, keep us posted.

 

[ALASHA]

This is what they did for Ultimate Adventure way back in 2007

Ultimate Adventure 2007 Jeep Wrangler JK - 4Wheel & Off-Road Magazine

Our 2007 Jeep Wrangler Rubi Wagon is starting to take shaper! Find out more in 4Wheel & Off-Road Magazine.

www.motortrend.com

 

[snout]

I am pretty much resigned to losing the electrical, especially on a jk with the whole tipm deal. If there are no coil springs available for that kind of weight, which I think there probably isn’t, it will be leaf sprung.

If you want a good read on someone who hot rod wired his JK, check out @KOWBOY and his "taken over" build thread here. It gets good at post 141.

2 doors, 6 gears and 550 HP!!!

Well, my JK is finally back home. She has been in the capable hands of Nemesis/Burnsville west for a few upgrades. More mods and updates to come later but here is where she stands today..... 6.7 HEMI (550 HP, 500 Ft lbs Torque) The torque is incredible, I was expecting a JK that ran like a...

www.jkowners.com

It continues over on Irate, here:

Jeep formerly known as 'The Turd'

I ain't gonna transfer all the build bullshit here from JKO but mize well start a thread I can chime in on once in awhile. :smokin: Done put 5500 miles on 'er since she left the friendly confines of TNT Customs last Fall. So we now interrupt our regularly scheduled programmin' for some...

irate4x4.com

 

[thedirtman]

Just set up with 2.5" coil overs up front and you will be able to get the coils you need.

 

[ALASHA]

MBRP Diesel Jeep – 4 Door JK Truck

We are in the process of beginning a new project, and would like to share our progress with you guys. As many of you know, we have been avid Jeep enthusiasts for many years, and have been in the performance diesel market for even longer… We have decided to take two of our biggest passions, and...

www.jkowners.com

This will be a good read as well for the diesel swap.

 

[White Elemant]

2007 Jeep Wrangler Rubicon JK 5.9L Cummins - The Ultimate Diesel Jeep - Diesel Power Magazine

Check out this custom diesel powered 2007 Jeep Wrangler Rubicon with a 5.9l Cummins engine, only in Dieselpowermag.com, the official website of Diesel Power Magazine.

www.motortrend.com

Oh the amount of work involved...