Well, after a week out of state, I got to work on something I wasn't terribly looking forward to (I know, dangling preposition and all...). I'm a planner, but not in the CAD sense. I need to look, do some fitting, try and then do. After taking off the front bumper and the (rusted) thin steel angle bracket, I spent time working out extensions for the front winch and new bumper.
Until I get my shop built (another project for this weekend), I'm working in the lava cinders and using my cribbing blocks for support. First, to tack weld some extensions onto the frame rails. Here, I'm lining the first one up. These are 1/4-inch thick pieces from the stuff I cut out of the back of the ambulance, hence that odd tab sticking up. That was part of the rear lift support structure and, obviously, at one point that got bent up.
Here are both sides, welded on. I beveled both the frame ends and the channel I'm adding, then stick welded them with 7018. After that, I cut off those extra tabs and ground one of the extensions down about 1/8th of an inch so they are exactly the same length. I was careful during the installation, to make sure they're both in the same plane and level. These form the "center" of the extension assembly.
To add additional support, for both vertical (jacking, primarily...) and lateral (for side-loaded winch pull) forces I added 3-inch wide channel which runs back underneath the frame rail as far as it will go. These are drilled and bolted to the frame, with 1/2-inch grade 8 bolts, at the same place where the prior bumper support was attached.
And, looking at the end, this shows what the main assembly looks like.
Tack on the winch mount and check for fit.
Bolt the winch in, temporarily, and see if I measured this all correctly. Because the hood tilts forward, you can't mount the winch too high without having to modify the hood and grill. I do plan to shorten the tilt stop cables some, so it doesn't tilt quite as far as it does now, but this seems to have worked out just fine - this is with the hood, unmodified, tilted forward to its current stops.
I still have a bit more work to do on the frame extensions and winch mount. I've got some 1/4-inch plate for the sides, about 8-inches tall, which will tie the sides into an integral unit and help resist upwards bending forces. That plate will bolt through the frame behind the hood hinges (pics when I do that, to help explain). And, to make sure that pulling forces are spread through to something which can't tear off, I've got some thicker (3/8-inch) bar stock which will run inside the frame channel and be bolted to the front suspension leaf spring supports... those bar stock extensions will extend forward and be welded to the shackle anchor, poking through the front bumper. As this is a 12,000 pound winch, we're planning for the ability to use a snatch block if needed. I want to make sure that both the winch and the cable anchor locations are secure and pulling on the frame far enough back that we're not stressing the front (and weaker) 5 inches of frame rail.
Stand by for pics, as I get to that... after my son and I build this shop building. It's nice having a truck big enough that we can carry 16-foot lumber inside!
Happy Labor Day weekend, all.