Can't wait to see the front bumper thread!
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Ha! You know, that's the one part of this truck I may never modify. I've got a cactus smasher on there with the chrome bumper and I just love the way it looks. I think i'd be kicking myself down the road if I ever got rid of it. I did make a front receiver hitch so I can run a winch up there currently anyway.
nice but for strength i would have run the brackets thru the bumper
Originally Posted by Hillbilly Heaven
I feel like a bumper should be just that a bumper. Designed to take impacts. If you are attaching pull points they should go thru the bumper and attach to the frame sammiching (yes I spelled that right) the frame rail between the clevis mount and bumper bracket. If the receiver goes thru bumper it should go back to a separate crossmember. This reduces the pulling stresses on the bumper and frame, spreading the load out over a greater distance and depth.
Just my two cents worth, but I over do things anyway.
I think in a perfect world yes you would run the brackets through the bumper and tie them directly into the frame. But it adds a layer of complexity to the design and really just isn't necessary or sometimes feasible. Also if you look at any offroad bumper on the market, none of them have clevis mounts tying through or into the frame. None of the fabrication parts retails sell clevis mounts designed to be tied into the frame. In fact, most are advertised as surface mount weld-in.
I also don't think there's any need to have a separate crossmember for the receiver. The pulling stresses are actually distributed pretty well to the frame with my design because 1) the receiver center axis is much closer to the center linear axis of the frame rails so there's no moment arm on the frame to create twisting and 2) the frame mounting bolts have a sufficient cylindrical surface area to transmit the load to the frame.
There are a few remaining design tricks I'll be using to add additional rigidity & weldment strength, however.
First, I do plan on 'sammiching' the frame rail with the current frame brackets and an additional plate on the opposite side. What this will do is tie the heads of all the mounting bolts together, so that if one comes loose, or if one tends to carry more of the stress than the others, that load will be distributed across all the bolts more evenly and I won't have any wallowing out of holes or localized bending in the actual frame rail.
Second, I will be adding some gussets to the frame mounts to add additional weld surface area on the back face of the bumper. This will disperse the load across a larger weld surface area and mitigate the risk of bad penetration on the current welds.
All in all though, this bumper is not designed to be a normal bumper because the truck is not designed to be a normal truck. I would say for a vehicle that isn't a daily road rig and is meant to provide functionality in an offroad environment, you don't want the bumper designed to deform under reasonable impact. You want a bumper that can be used as a sliding barrier between obstacles, you want a jacking point, you want maximum departure angles & ground clearance, air tank functionality is nice, and of course you want to be able to carry a spare tire securely. None of those features are realistically attainable with a 'normal' bumper that you would want on a strictly street vehicle. That being said, I do have to consciously take the risk of having an ultra-stiff bumper while on-road and potentially killing my frame and taking a larger shock with a rear-end impact. But that's the risk I and thousands of others are willing to take I suppose...
1979 Bronco 400m 0.060 over 'Black Betty'
-Edelbrock Carb & Manifold, Hedman Headers, Flowmaster Dual Mufflers, Comp Cams Extreme Energy Cam & Valvetrain Kit
-Duff LAs, WH progressive coils, Bilstein 7100s Lincoln HB, York OBA, Taurus Radiator Fan