Reparing/beefing up rear of YJ frame with square tube (PICS) - JeepForum.com
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Unread 01-14-2013, 05:42 PM   #1
CDW_327
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1993 YJ Wrangler 
 
Join Date: Aug 2010
Location: Commerce MI/Traverse city MI, Michigan
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Reparing/beefing up rear of YJ frame with square tube (PICS)

My Yj has a little bit of Rot at the very back of my frame, not as bad as most but it's there. What I usually see people do to fix the shackle mount rot is cut out the bad and weld in plates, which works but doesn't gain you any strength over stock. Does anyone have a pics of replacing the back like 14" of the frame with square box tube? My plan is to cut the frame off about 14" back from the back end, but weld the new square tube in and weld fish plates over the seam. The only tricky part would be the bend in the frame right around the shackle mounts. I'm planning on welding a 2x4x3/16 square tube in for a rear crossmember with d ring mounts and 2" receiver, so I am looking for added strength. It just seems like totally replacing the back section of the frame with square tube would be way better then piecing it in with 1/8" plate...

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Unread 01-14-2013, 08:46 PM   #2
Ironworker709
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People generaly use at least 3/16" plate for replacement patches on the frames,at least one's who want a little extra security it is strong enough and better than stock.That would be much better than stock and more than stong enough for a 2" receiver crossmember.

Sounds like you have it well planned out to me,as far as the bends,i would just go with cutting the plate sides according to the bends and box it in and weld it up.as long as it's 3/16" plate and welded correctly it will be alot better than stock.

If all done the way you want,the only place of concern would be where it all ties into the existing factory frame,weld it 100% pen and then added fish plates or AKA diamaond plates,,make sure your fish plates have no sharp edges or sharp corners,round everything off,sharp corners are an area prone to crack and tear later from stress risers from the opposite sharp turns in the welded area.
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Unread 01-16-2013, 12:10 PM   #3
fyrfyr
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http://www.greatlakes4x4.com/showthread.php?t=241476

I have a few pics on the link above showing how I did it. Fish plates were added after the photos.
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