CJ frame vs. YJ frame - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 10-18-2005, 05:16 AM   #1 (permalink)
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CJ frame vs. YJ frame

How different are they? I've never seen the 2 in comparison and am wondering if you could easily put a YJ frame in a CJ and vice versa...

TIA
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Old 10-18-2005, 05:26 AM   #2 (permalink)
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There is a bid differance. If you are going to buy one to build get the YJ frame. It is a lot thicker better built and the springs are a lot more flexable. They are a lot easier to find and because they are not as old they are usually in a lot better shape.

Personally I would not build on a CJ frame,if there was a choice.

JOSH
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Old 10-18-2005, 05:36 AM   #3 (permalink)
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but could i replace my 79 CJ7 frame w/ a YJ frame? i know the body mounts will be a bit different, but is that about it?
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Old 10-18-2005, 05:49 AM   #4 (permalink)
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yes you could do it, there is not much different, But the frame on a YJ is a little wider in the front so I dont think your stock Axle spring perches will line up here are spec sheets on the dimensions for each frame


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Old 10-18-2005, 08:00 AM   #5 (permalink)
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It's fairly common for CJ7 people in the rust belt to replace their CJ tub with a YJ tub. This is basically the inverse of what you are talking about.
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Old 10-18-2005, 08:14 AM   #6 (permalink)
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Quote:
Originally Posted by redwrangler97
but could i replace my 79 CJ7 frame w/ a YJ frame? i know the body mounts will be a bit different, but is that about it?

The YJ frame will almost fit on the outside of your CJ frame.

If you are using wider axles than stock CJ wide track, it will work better.

You will need to use a YJ steering box or do a lot of fab work.

You will need to fab engine mounts.

Fuel tank may be a problem, again unless you use a YJ tank.


Yes you can do it, but the more YJ parts you have the better.

It would be a better idea to get a YJ tub and frame, then add whatever CJ parts you have left to it. IMO
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Old 10-18-2005, 02:02 PM   #7 (permalink)
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I know of a couple guys running YJ frames on their CJ's. If you want to keep your widetrac CJ axles, you will need 2" wheel spacers to keep the tires out of the inner fenders. Personally, I don't like spacers that thick but go for it.....and let me know how it works for you!
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Old 10-18-2005, 05:22 PM   #8 (permalink)
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ok heres what i sorta got in mind: YJ frame on my CJ. swap out axles D60s maybe, SOA w/ YJ springs, fuel cell, then try to use everything else thats already on the CJ.

oh yea and the fenders will def be cut
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Old 10-18-2005, 07:43 PM   #9 (permalink)
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jeepinwhores, can you get some more info from those guys you know?
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Old 10-19-2005, 05:27 AM   #10 (permalink)
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Originally Posted by redwrangler97
ok heres what i sorta got in mind: YJ frame on my CJ. swap out axles D60s maybe, SOA w/ YJ springs, fuel cell, then try to use everything else thats already on the CJ.

oh yea and the fenders will def be cut
Red, if you are going to do this, be prepaired for some work. The tub is very similar but it is alot of big differances. If you stay leaf sprung and use D60's you can use a kit that will be a pretty much bolt on from BTF. i have seen this kit installed and it is a great kit. I would start there. If you are going to use the YJ frame do use the YJ steerbox It is just a Saginaw 4 bolt box.
unless you move your axel back in the rear the fuel tank should work fine.

JOSH
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Old 10-19-2005, 06:06 PM   #11 (permalink)
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im prepared for work just wondering exactly how big of a mess i'm gettin into so i can plan ahead, ya know?
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Old 10-19-2005, 06:27 PM   #12 (permalink)
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im prepared for work just wondering exactly how big of a mess i'm gettin into so i can plan ahead, ya know?
Plan on a lot of rusted bolts. Soak it down on all the bolts you can think of everytime you think of it untill you start the project. especially on the body mounts.

JOSH
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Old 10-19-2005, 07:31 PM   #13 (permalink)
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Quote:
Originally Posted by SPEEDCRAVIN
Plan on a lot of rusted bolts. Soak it down on all the bolts you can think of everytime you think of it untill you start the project. especially on the body mounts.

JOSH
haha yeah im ready for that, rust is the reason im replacing the frame in the 1st place
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Old 10-21-2005, 05:06 PM   #14 (permalink)
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So far nobody has addressed the fact that the wider frame will mean the springs are further apart, side to side. What difference does this make?

The springs run directly under the frame rails and the perches on the axles will not line up with them under a YJ frame. No biggie on the rear since it's easy to relocate them.

The front is a bit more involved since the passenger perch is cast into the center section. A '79 CJ is narrow track and there's not a lot of real estate between the center section and the knuckle to be moving the perch outward.

Of course nothing has been said about what axles will be used, so it may be a moot consideration.
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Old 10-21-2005, 06:57 PM   #15 (permalink)
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im swappin in heavy duty axles. lookin at dodge 1tons. d70r/d60f
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