Rear Frame Bumper Reinforcing Brackets - JeepForum.com
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post #1 of 16 Old 04-07-2018, 09:27 PM Thread Starter
MigMan1313
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Rear Frame Bumper Reinforcing Brackets

I was reading this thread Thursday about the rear stock frame rail and how with aftermarket bumpers if you’re not careful the rear frame rail can bend and be damaged. Along with that there were recommendations to get these brackets that allow you bolt the bumper to part of the frame near the spring hanger. They looked like this,
I recently replaced my rear frame rail with a stock spec replacement not knowing that this problem could occur. If I had known at the time what I know now I would’ve purchased one of the thicker 3/16” rear frame cross-members instead of the oem one.

My question is if I purchase those brackets how will they workout with the spring hanger on the rear? It’s hard to tell online because all the pictures I can find show the brackets on a TJ even if they’re listed for the YJ. Or is there a better solution to this problem? Some sort homemade gusset that I can throw on there and call it good?


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post #2 of 16 Old 04-07-2018, 10:06 PM
Shadownwpa
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Looks like that specific bracket would be in the way of the shackle mount. I seem to remember another frame tie-in bracket that was discussed a while back that was made for the yj. Keep looking and something is probably out there already for it.

I can see why the rear crossmember wouldn't be trusted. The factory welds holding mine on were complete garbage, full of porosity and lack of fusion.

https://www.jeepforum.com/forum/f22/shadownwpa-91ish-yj-build-thread-1857154/
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post #3 of 16 Old 04-07-2018, 10:49 PM
Mr.B
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I believe that there are two different brackets. A lot of sites will show only one pic for both. I had a set of brackets for my Warn tire carrier/ bumper. But I didn't need them, because I replaced the cross member with 3/8" angle iron.


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post #4 of 16 Old 04-08-2018, 04:51 AM Thread Starter
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I found one on A to Z Fabrication that is specific to the YJ, I’ll go ahead and pick them up and see what happens.


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post #5 of 16 Old 04-08-2018, 06:59 AM
jserna
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Those are the ones I was going to recommend. I have a set for my YJ just have not had time to install.
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post #6 of 16 Old 04-08-2018, 08:28 AM
Awesome
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The YJ frame tie-in usually bolts to the bottom of the frame, where a nut is welded to the inside of the frame tubing.

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post #7 of 16 Old 04-08-2018, 11:03 AM
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I found one on A to Z Fabrication that is specific to the YJ, I’ll go ahead and pick them up and see what happens.
Zach (owner of A to Z) was a long-time vendor, avid supporter here, and overall great guy. I first met him on a Jeep run ~17 years ago where I sat shotgun in his YJ.

If you call him on the phone, tell him I said hi. I doubt if he still gives a JF discount, but you could ask.
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post #8 of 16 Old 04-08-2018, 11:32 AM
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Some sort homemade gusset that I can throw on there and call it good?
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The YJ frame tie-in usually bolts to the bottom of the frame, where a nut is welded to the inside of the frame tubing.
^
this...
I just cut a piece of 2"x1/4" flat stock (length can vary) and then drilled a hole to match the hole in the bottom of the frame. Got a grade 8 bolt to fit the threaded hole (don't remember size) and then after snugging it into the frame with the piece, welded other end to my homebrew bumper which was bolted to the OEM holes in the cross member. (bumper was flush to frame, btw) It worked great and I smacked that bumper on many a rock for years.

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post #9 of 16 Old 04-08-2018, 12:31 PM
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post #10 of 16 Old 05-25-2020, 08:24 PM
Trjeeper
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Mr. B what dimensions angle iron did you use and how did you attach rear bumper to that?

Last edited by Trjeeper; 05-25-2020 at 08:48 PM.
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post #11 of 16 Old 05-25-2020, 08:42 PM
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Mr.B is sadly not going to be able to answer that for you @Trjeeper

you can clearly see in the photo it is welded at the frame to angle iron. The body mounts passing through would do the rest
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post #12 of 16 Old 05-25-2020, 11:46 PM
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Mr. B what dimensions angle iron did you use and how did you attach rear bumper to that?
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That's what I did. There is also some of the original crossmember left, around the frame, that the angle iron was welded to. The second pic is what it looked like just before welding.



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It's been a few years since I did it, so I went out and measured it. It's 3 1/2" on the top, 4 1/4" down, and 54" across. Those are outside measurements. It doesn't have to be 54", but I think that's what it was stock. Or I might have had some other plans back then.
FWIW, I bought TJ brackets and trimmed them to fit.

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post #13 of 16 Old 05-26-2020, 03:57 AM
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I did this on my TJ. You could do something similar and use the inner mounting points. No body lift needed, everything clears (even stock fuel tank cover).
I fishtailed the bolts through the (existing) big hole in the chassis rail. Nuts went on fine with an impact wrench.







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post #14 of 16 Old 05-26-2020, 04:56 AM
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I used a piece of 2x2 1/4” wall tubing inside the oem rear crossmember.

I Welded the ends to the frame rails (which are an optimistic 3/16 thick) and had pre-located about 10 or 12 3/8 nuts inside that- lining up with factory holes in the crossmember plus a couple extra I drilled. 1-1/4” receiver welded to that.

Then, a piece of 2x5” of “light” C-channel (mimicking the front oem bumper, only much heavier) is mounted to that with grade 8 bolts into the welded nuts in the 2x2 effectively sandwiching the oem crossmember. The oem 7/16 threaded holes on the bottom of the frame behind the shackles are picked up by tabs I welded to the bumper that support some front tow hooks robbed from a 90s Chevy pkup. (Which are also welded to the tabs and bumper - with the 7/16 bolt passing through the original mounting hole)

That ‘may’ not be 100% adequate for, say, a custom swinging tire carrier with a 35” spare, but it’s at least as strong as a factory-style 1-1/4” trailer hitch receiver, it gains several inches of departure angle clearance, improves flexible use, and if you can wreck THAT setup- at that point you probably have much more significant problems than worrying about the rear crossmember. Plus the bumper is removable.

In other words, those frame support brackets are a great idea but are not the only way of dealing with the issue.

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #15 of 16 Old 05-26-2020, 06:39 AM
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RuffStuff has a brace.
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