Felt the need to weld and grind stuff so started on rear bumper v2.0. I have a lot of other upgrades I want to do, but for some reason re-doing the bumper made it to the top of the list. Guess it is because it will have a quick impact on how it looks. Getting a little further away from grandpa truck.
Another reason is to improve departure angle, which sucks on a long bed. Had dreams of bobbing the bed, but with fuel tank there I don't think I will do that any time soon if ever. The old bumper hung low and far out, lots of room for improvement, but still up high enough to fit a bar stool under. I built frame mounts to adapt this old school bumper back in November, so it made it 7 months. Was a PITA to install after final welds, fail on the bracketry.
So started with some sketches and Cardboard Aided Design (CAD). I stole the design from CBI's taco bumper, minus the swing arm and side plates. Considered cutting lower rear bedsides instead of cutouts in bumper top, but didn't see a big benefit.
As good as it looked on the bench, it was a fail once I put it on the truck. Ratios off. Too big and fat. Didn't match front bumper.
So on to CAD design #2. Removed the vertical plate to make it a 3-sider like the front bumper. Condensed depth 2" to slim it up. Taper starts narrower in at step instead of at frame width. Now it looked too compact and tight, ratios still off.
So final design got widened an inch, top a inch deeper, and sides tapered less. With final cross section shape I modified the brackets, although height is dependent on width along taper. Added some scabs to raise height of top of bumper by 4" over the old. The step and receiver are up 3/4" over the old bumper.
Cut some shapes with plasma and tacked pieces into a bumper looking thing. The bumper ends hit the bed corners, as expected, so I modified the sheet metal slightly to provide clearance. Still a long way to go, next steps are the receiver, bracing, attaching brackets, clevis mounts, wiring plug hole, license plate threads & light and so on.