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Mounting a Custom Rear Bumper

goathearder

goathearder

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Hey All,
I am getting ready to start fabbing my rear, swingout bumper and I just wanted to make sure my mounting plan is correct.

From what I can tell from pictures of others I have seen, people tend to just use a piece of 1/4 plate on each side and bolt that to the frame with like 4 bolts on each side. Is that the best way to do it? Is there any frame reinforcement necessary?

I can tell already that I am going to have to cut the ends off the frame a bit so the bumper doesn't stick out super far, is that going to cause issues with frame strength?

If anyone has pictures of how they mounted theirs, that would be super helpful too.

Thanks,
John
 
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Just to put a picture out there, this is what I am thinking. This is how the ORD rear mounts however theirs is not a swingout design. Is something like this strong enough for a swingout bumper?

Rear bumper mount.jpg
 
Use Grade 8 hardware, 5/8" or better,and DO NOT MESS with the frame flanges. It appears that ORD's wraps around the frame, good idea. I've not seen theirs first hand but it also appears they are using the smaller diameter pipe to help support the side loading (corners of the bumper towards the frame). This area is where I would focus some "extra" gusseting or support, especially if you will be hanging a 35" larger tire off of it.

I've looked around and found some sharp looking designs out there. There are quite a few kicking around here (CK5) as well.

One more thing, try to "reuse" any factory holes through the frame. Drilling your frame into swiss cheese is not a good idea.

Good luck and take pictures. These are just my opinions, and I did not stay at a Holiday Inn last night. Take them how you wish. I do similar stuff at work all the time, with larger trucks and utility equipment, so if you have any questions as you go let us know.
 
Ok, so DPI has customers hack off like 4 or 5 inches from the rear of the frame as seen in the pic below and I think that is the only way I am going to get the bumper as close to the body as I want it.

Is this frame chop common for people who have made their own bumpers?

rearcutframe.jpg
 
Wow, I can't believe I haven't gotten more advice. I know there are lots of people on here who have fabbed their own stuff.

I guess I am just going to march forward and see what happens, hahahahahaha.
 
haven't done my back, so I'm no help.... the ORD setup is nice.. ya want big full plate up the rail as much as you can get.... i tend to like 3/8's for that stuff... and as mentioned, for a swing out, that additional outer brace to farther up on the bracket is a must imo...


are you building tube or plate?
 
I am going to use 2x4x3/16 for the main bumper body and then I was planning on 1/4 plate for the mounting brackets and I was going to run that plate all the way up the frame to the shackle mount. There are 4 holes in the frame I can use already and I will probably add a 5th one.

For the actual tire carrier, I am using 2x2 and this hinge in the mega duty version:

http://www.atozfabrication.com/store/Tire-Carrier-Swingout-Heavy-Duty-Hinge-Kit.html

I hadn't thought about additional bracing to the outside but I am definitely planning on doing that now as well.
 
/1/4" is plenty enough to support the weight. I built one for my didge a few years ago, I used 6x3 7ga wall tubing. I then used a strailer spindle kit from TSC to support the swinger. I used 7ga 2x2 angle for the upper swing frame with a piece of 2x2 7 ga wall as the center upright for the main weight support. I built the upper tire frame in a triangle frame assembly then tacked onto the swinger with the lower ps of the trianble attached to the uppper part of the hinge. Tying it all together. I have had 600 pounds on the swinger, extended at a 90 degree angle from the bumper with no droop in the hinge. I did preload the hinge to 75 ftpds to avoid slop when it is worn it. My only issue with the complete setup is that I don't have a stop to keep the swinger from swinging all the way out and breaking the real tail light ( I have replaced it three times since installing). I took 3x3 1/4" angle and bolted to the frame rail, then got the main tube where I wanted it and welded them into place.
 
To add stiffness to the corner with the spindle, I added a piece of square tube running from that corner to the frame. It goes at about 45 degrees from the frame and mounts to an existing hole. Sorry I can't find any pics. But it really helps the "twisting" that end of the bumper wants to do.
 
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