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Originally Posted by redrooster
I recently swapped a YJ frame under my CJ, so here's the deal on going the other way.
First and foremost, the YJ frame is 4" or so wider in the front than a CJ. This means your motor mounts won't work, and neither will the spring mounts on the axles. You would have to fab mm's and move the springs outward.
Next is that only 6 of the 8 tub mounts line up and the grill support doesn't line up either.
I haven't checked out the crossmember, but since the YJ had a different trans and t-case (driver drop) it is doubtful it would work.
My opinion, get a new YJ frame or weld and plate the crack you have. If the crack in the pics is the only one, then I would say repair it.
I got a YJ frame in good shape from Palmer Brothers in Birmingham, AL for $300. They had several. It would save you a lot of time and hassle to replace like for like. A shackle reversal is easy enough to do on your own after the swap.
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i have little-no experience with frame modification, so i dont quite know what im doing with that, that is why im hesitant to work on the frame, i have always understood if the frame is cracked, (especially on a flexing vehicle) you dont weld it, because the welds wont hold... that is the only crack, and it is rotted out on the bottom where the steering box is... im also kinda worried aobut what else may be rotting in this frame... if i do fix the old frame, anyone know someone that wants a modified cj7 frame?
i paid for the frame, and im not using it as lawn furniture, as good as it does ... do you have a site/number for palmer brothers?