CJ to YJ Frame - JeepForum.com

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post #1 of 8 Old 07-25-2007, 07:39 PM Thread Starter
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1985 CJ7 
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CJ to YJ Frame

I am doing a YJ body swap and have recently found out through some good advice on the forum that my frame is not worth repairing. If I were to get a YJ frame, what mods would I have to make for the engine, axels, tranny, gas tank etc..? Thanks in advance.

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post #2 of 8 Old 07-25-2007, 07:43 PM
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Probably very few to none. Seems to me like I remember reading that the frames between the CJ and YJ were nearly identical.

80 CJ5 in the process of a frame up resto
96% complete.
The little stuff will kill me.
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post #3 of 8 Old 07-25-2007, 07:48 PM
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A couple of things, Make sure you get the YJ springs, if you are going to run your CJ front and rear ends, you will need to change the spring plates to 2 1/2 , CJ front is 2". YJ's use a different connection to the power steering box. Most everything else is straight forward. Someone must have a write up on this I would think.

85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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post #4 of 8 Old 07-25-2007, 08:10 PM Thread Starter
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Thanks guys. Here is the link that BESRK gave me. What do you think? Let me know if you come across any write-ups on the YJ-CJ frame swap.

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post #5 of 8 Old 07-25-2007, 08:48 PM
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nope nope nope! The frames aren't the same at all. Its the tubs that are close. If you put a YJ tub on a CJ frame, you alter the rear most mounts and the ones in front of the rear tires. For CJ drivetrain to fit a YJ frame...that a different story. The YJ frame is 4 inches wider, taller in the front grill mount, has wider and longer springs, different brake, fuel, and exhaust routing and tank side fill. Heres wht you do in your situation. Use the YJ tub unaltered on a YJ frame with YJ springs. Use the CJ motor, trans and t case and find a set of Scout or Wagoneer axles (these will bolt in to the YJ frame alot easier. The tailgate you run will determine CJ or YJ hard or soft top. Oh yeah, you should need a slight body lift to get the CJ front clip to fit the height of the YJ front frame mount. All of this is just an idea!

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post #6 of 8 Old 07-25-2007, 10:07 PM
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only in a jeep pretty much nailed it...the frames are a good bit different and that extra width creates issues with tire clearance with the CJ axles. There's a good bit of info on this in a thread or two in the CJ forum over at jeepsunlimted.com that was posted within the last couple of months, so I'd suggest that you do a search over there.

'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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post #7 of 8 Old 07-26-2007, 08:34 AM
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I posted some pics of a guy doing this in the JU thread jeepskate mentioned. It looks sketchy at best. Search for posts by user name "cjmike" and look through the threads I posted in to find thread. Might be easier than wading through all the threads that search gives you.
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post #8 of 8 Old 07-26-2007, 10:07 AM Thread Starter
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Thanks a lot guys. Maybe I will try to find a decent CJ frame and go from there. Once a get past this, hopefully the rest of the swap will go okay.
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