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Old 07-06-2014, 01:15 PM   #1
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JK Frame

Hello,

typicalle this is a question for open c-channel frames, but maybe someone knows a bit more:

1. How thick is the metal of the Wrangler Boxed JK-Frame?

2. What are the outside dimensions and do they differ for the rubicon?

3. Does anyone know if the military J-8 uses thicker steele or just some metal pieces to strenghten the frame.

4. Is the frame comparable to the Land Rover Discovery 3 (2005+)

Greetings

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Old 07-08-2014, 09:25 AM   #2
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Well the older one have been either 1/8 or 3/16" in thickness, but i'm afraif the reduced the mtal when boxing the frame. which i do not like that much.

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Old 07-08-2014, 10:25 AM   #3
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Quote:
Originally Posted by Oshkosh-P View Post
Hello,

typicalle this is a question for open c-channel frames, but maybe someone knows a bit more:

1. How thick is the metal of the Wrangler Boxed JK-Frame? Somewhere between 1/8 and 3/16 on an inch.

2. What are the outside dimensions and do they differ for the rubicon? Rubicon is the same frame as the Sahara and Sport

3. Does anyone know if the military J-8 uses thicker steele or just some metal pieces to strenghten the frame. Have not physically inspected a Military J-8

4. Is the frame comparable to the Land Rover Discovery 3 (2005+) Totally different vehicle....what are you trying to compare?

Greetings
What exactly are you fishing for about the frame? I have not seen any failures out there.....other then rust issues but those were not in JK's.
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Old 07-08-2014, 11:30 AM   #4
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There's almost a zero percent chance the J8 has a different frame. The military specifically wants a lot of "commercial off the shelf" (COTS) systems to cut down on dedicated R&D time and money. Things like this and consumer electronics are exactly why. Another example is aircrew survival kits, which contain regular (usually older versions) Garmin GPS units.
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Old 07-08-2014, 02:11 PM   #5
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Of course the D3 is a very different vehicle, it's bigger, has two independant suspensions etc. But together with the Mercedes G-wagon it got one of the toughest frames i know, but unlike the g-wagon it is a new design for the civilian market, just like the Wrangler. This is why i choosed this frame for comparsion.

Do you have the rest of the dimesnions? it looks like something around 160 in height and 70 in width (6.2"x2.7") so pretty much like the g-wagon.

Si the thickness is around the same as it was before? they did not reduce it when changing to boxed? This would mean the new jk has a MUCH tougher frame than it's predecessors. This is a good thing, especialy for me because i likte to use a rubicon as basic plattfor for an offroad camper.

Around here the Land Rover defender or mercedes g-wagon are much for common for this, but the defender has a just weak engine and the g-wagon is of course at least twice the price.

I asked about the J8 because it got that nice dana 60 rear axle, good for camping, nd the company does indeed mention something about a frame upgrade:

Jeep J8 - Home
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Old 07-08-2014, 04:12 PM   #6
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One of the things I like about the Jeep going to 4 doors is that presumably the 2-door has a stronger frame than it really needs (I bought a 2-door). My Jeep was a bit of a nostalgia purchase and I remember my high school Jeep CJ developing cracks in the door sill plate from all of the flexing (admittedly I was quite abused and spent some time airborn).
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Old 07-08-2014, 04:36 PM   #7
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It says "reinforced chassis" which could mean anything, including adding skidplates. That's my guess. Designing a new frame isn't a cheap or quick process, and the specs look identical to a JKU. Granted, they could've designed it that way, but I'd expect them to highlight such an investment rather than burying two words near the bottom of the spec sheet. I'm going with skidplates.
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Old 07-08-2014, 05:01 PM   #8
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Looking at the pictures the j8 is based off the 4 door frame and has rear leaf spring design. So being that they changed the rear suspension who know what they changed on the frame.
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Old 07-09-2014, 04:09 AM   #9
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Yeah i guess the skidplate-idea is the most likely. They do it the same way to get the g-wagon up to 10.000Lbs.

But is the basic wrangler jk comparable to the g-wagon frame in strenght? Campers built on land cruiser light dutys or hilux pickups did indeed crack. The g-wagon campers did not crack. That's why some more measurements would be interesting.
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Old 07-13-2014, 09:59 AM   #10
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Hmm apparently no one ever had to repair a JK frame, which is a good indicator, but still, absolute no one got those measurements?
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Old 07-13-2014, 01:24 PM   #11
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So I'm assuming you do not have a Jk, you want me to go out and measure the wall thickness?
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Old 07-13-2014, 01:40 PM   #12
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The frame is 5mm thick, 5.5 inches tall, 3 inches wide measured directly under the cowel. It appears slightly taller just behind the motor mounts but the thickness appears consistent. That what your looking for?
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Old 07-13-2014, 01:51 PM   #13
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Yeah that's pretty much it! The model is quite rare around here. But you're shure about the thickness? Height and width of the rails are pretty comparable (althought the height appears to be significantly lower) to other competitors of that "weight class" (land cruiser, defender, g-wagon, patrol etc.) but the thickness seems to be a lot?
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Old 07-14-2014, 12:11 AM   #14
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There's almost a zero percent chance the J8 has a different frame. The military specifically wants a lot of "commercial off the shelf" (COTS) systems to cut down on dedicated R&D time and money. Things like this and consumer electronics are exactly why. Another example is aircrew survival kits, which contain regular (usually older versions) Garmin GPS units.
The J8 frame is different. It is set up for rear leaf springs, and not a control arm suspension. The "military" did not "spec" the J8. The few J8's used by the U.S. Military were bought from third-tier aftermarket companies who custom built them from J8 platforms and not from Jeep. Jeep designed the J8 for foreign military sales and manufacture while under the control of Daimler-Benz, and the vast majority of J8s are manufactured outside the U.S. for foreign customers.
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Old 07-14-2014, 12:25 AM   #15
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Originally Posted by kmrtnsn View Post
The J8 frame is different. It is set up for rear leaf springs, and not a control arm suspension. The "military" did not "spec" the J8. The few J8's used by the U.S. Military were bought from third-tier aftermarket companies who custom built them from J8 platforms and not from Jeep. Jeep designed the J8 for foreign military sales and manufacture while under the control of Daimler-Benz, and the vast majority of J8s are manufactured outside the U.S. for foreign customers.
Actually, I'm pretty sure ALL the J8s are built in Cairo, Egypt.
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Old 07-14-2014, 03:38 AM   #16
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Yeah but i guess it will not differ to much beside the rear parts for the leaf spring ? I don't know how difficult it is to change something like the thickness for example, to built a HD variant.

But nonetheless, 5mm would be extreme, consider a Chevrolet silverado 3500 got 4.5mm or the Ford 150 with payload package got 3.8mm....
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Old 07-14-2014, 11:09 AM   #17
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Ok so I apparently can't measure. Ok so I measured under the passenger door and got 4mm thick, and further back towards the rear I got 3mm thick.
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Old 07-14-2014, 02:17 PM   #18
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Hi, thank you very much for the effort! Yeah that sounds quite right, i guess the outside dimensions will change a bit too, since this is a quite modern frame and they typically change the form a bit more.
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Old 07-15-2014, 09:38 AM   #19
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Nice now i am confused. A buddy of mine who got to measure a wrangler frame two days ago, told me something about the frame being more like 6.8x2.5". (he did not measure thickness because lack of proper equipment)

Since he measured a standart non-rubicon, maybe there is a difference?
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Old 07-23-2014, 03:41 PM   #20
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The LR3 does not have a traditional body on frame design. It's a hybrid unit body/ladder frame that is unique to Land Rover.

Mike

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