JK frame

[ScramblerCJ8]

So, the frame on my J truck is pretty bad and I saw a magazine article of a J truck on a JK frame.
So I looked on line forums and also wrecking yards. The cheapest I found was in southern Ca , 1000$ plus shipping to Oregon.
Then last week, a friend send my a link to FB market place and there it was, a 2012 Jk frame for 250 bucks, in Tacoma WA. Texted the guy and yesterday hitched my flatbed and went and got it. I think is going to be a cool build with all the JK suspension components.

[SJTD]

$250 Including the axles and suspension parts?

[hutcho]

Following.

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[ScramblerCJ8]

No, just the bare frame. I got a D 60 and D 44 out a F250. The front D 44 has the diff on the driver’s side already.
I also got a 3.7 LS out of a 02 Silverado, 700R 4 stand along, no lock up converter or VSS .
I already build and modified the transmission, short output shaft with Jeep splines and a 241-J T case out of a Jeep Rubicon. Has a 4to 1 low.


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[ScramblerCJ8]

Sorry about auto correct. Engine is a 5.3 LS Vortex.


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[ScramblerCJ8]

As I mention before, when I join the group, the J truck is way back on my list of projects to get done.
Right now getting close to finish my other baby Jeep, CJ 7 and next is the Waggie.


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[ScramblerCJ8]

Not good at posting pictures


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[Stuka]

JK frames are pretty stout. The wheel base is 3” too short for a short box J10, but that’s easy to extend. You can even buy kits that do it for guys that comp cut their fenders.

[ScramblerCJ8]

I have a thrift-side bed out of a 63 Gladiator that my son parted out due to rust. Can I just move the fenders back?


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[Stuka]

I have a thrift-side bed out of a 63 Gladiator that my son parted out due to rust. Can I just move the fenders back?


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You would have to move the fenders forward, making for a larger rear overhang. I think you would be better off pushing out the wheelbase on the JKU chassis, and then lengthening the frame a bit for the bed. Unless you want to shorten the bed that you have.

JKU = 116"

J10 = 119" (Although some places list it as 120)

The thrift side bed came in two wheel bases. 120, and 126.

[ScramblerCJ8]

Thanks for all the tech info, that’s the reason I’m here. Looking at Jk frames on line, found some wrecking yards selling either the front and rear frame sections separate, and looking at the frame I can see where the joints are. So I think stretching it would be the best option.


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[Stuka]

Thanks for all the tech info, that’s the reason I’m here. Looking at Jk frames on line, found some wrecking yards selling either the front and rear frame sections separate, and looking at the frame I can see where the joints are. So I think stretching it would be the best option.


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That would work well too. The front third and rear third are the same for 2dr and 4dr versions. The 4dr just has the extra bit in the center. So extending it would work fine too. And give you a nice departure angle.

[ScramblerCJ8]

That’s a. very good suggestion. I was looking at the jk frame and I can blow those welds off and build extensions myself. Definitely I will be adding to the rear of the frame so I can install the bed without modifications and keep the stock look. I have to replace the rear crossmember anyway, cause it was rear ended and is bent in. That’s an easy fix.
I should mock up the cab and bed on the frame before doing any welding!


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[rocklaurence]

I believe that you can buy extended rear 4 links that will push the axle back. So, you may not need to extend the frame. Lock at the Long arm suspension kits to find out.