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Discussion Starter #1 (Edited)
I was actually documenting this build on FB, & was asked to post the build here for those that do not have/use that form of social media. (facebook absolutely sucks for documenting a build by the way)

So for those interested, here it is, A big dumb mud truck build in general4x4 :flipoff2:


I've never really been one to name my rigs outside of what project they are, But when my daughter was about 4 years old (a little over 3 years ago) she suggested I build a monster truck, I thought it was a great idea, & this is about as close to a MT as I'll ever get, She was also the one that named it "Midnight Panic" & has already weighed in on a few important decisions like color, & wheel pattern design,
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The current plan/outline will be a tube chassis, rear engine late 70's Ford,
Powertrain will consist of a 547ci Blown/injected Ford, backed by a shorty C6, & 18" reverse rotation SCS drop box, 1550 series / 8.5c drive lines & Axletech 4000 diffs,

The parts gathering stage started over three years ago, beginning with engine ,suspension, & drive train parts,

One of the first big ticket items was eight 26" travel Overtime CNC nitrogen shocks,
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A couple of short tail shaft C6 transmissions, I bought them for the output parts, but it appears they have a lot of good stuff inside, & turns out they actually came from the Bigfoot shop! (this is actually kind of a big deal in a small way to me)

Another critical part I gathered up early on was the differentials,
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A pair of Axletech 4000 steer axles.
 

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Master of none.
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Discussion Starter #2
Early in this build I jump around a lot, playing with different parts, & never really focusing on any portion for an extended amount of time, just tinker with small things when I had time between other projects,
An example of that is the wheels, when the 19.5L-24 R2 tires became available I knew that was the tire I wanted on the truck, so I bought a set, then ordered some 24x12 rim shells, I sat down & drew around a half dozen different patterns for wheel centers, then left the final decision up to Allison on what style the truck would run, of course she picked probably my least favorite design, but after many attempts to sway her I knew it was a loosing battle, & just went along with it, now that they are done, I have to admit, I'm happy with how they look,

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The wheel shells were stripped of paint & tabs, then a 3/8" steel plate flange was cut & welded/gusseted in, the wheel centers are 3/4 7075 aluminum that were cut on a water jet table, then machined/polished here at the shop.
since they are a tube type tire internal double bead locks would not work with tubes, & rather than use a bolt on outer bead lock I opted to go with rim stiffeners on both inner & outer beads, then rim screws on the outer bead to keep the wheel from spinning in the tire.
They've only seen light testing on the buggy so far, but look like they should work well,
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Since I have done several sets of Axletech 4000 steering arms, it's only fitting I built the ones going on this project, only this set is a little different, rather than use 1" mild steel, or 3/4" T1, this time 1.25" 7075 aluminum was the material of choice, kind of an experiment to see how they hold up,
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There was enough material left over to build some lower king pin caps as well, rather than cutting down the stock steering arms,
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Once complete there will be a double shear tab under the Aluminum arm for added support.
 

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Discussion Starter #3
Another part that is pretty well sorted out is the brakes,
Rather than run wheel brakes, or even pinion brakes, I figured mounting them up on the t-case/drop box would be a safer location,
7075 aluminum adapters were spun up, then drilled/tapped for both the rotor, & the flange pattern, so no nuts are needed to bolt the drive lines in place,
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Next the rotors were cut out of 3/8 plate, machined flat & sent off to be liquid Nitride coated,
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One of the Willwood calipers is mounted directly to the case, the second will have a bolt on mount that attaches to the other side of the SCS & will be used on a second rotor on the opposite output shaft,
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The drop box/T-case was originally an SCS 12.66 standard rotation piece, after I had I received it I decided an 18" drop case would be better, rather than try to sell this one for a loss, I went ahead & ordered the parts to make it an 18" reverse rotation case, a couple evening on the mill had it converted, but I did not get any pics of the process.
 

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Discussion Starter #4
The engine is yet another area I have been tinkering with off & on,
Long story short, it will be based of a 460 Ford, using a Ford Motorsport A460 block, bored 4.500", a 4.300" stroke Scat forged crank, Groden 6.900" aluminum rods, & coated Icon pistons, for a total of 547 cubic inches,
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For the top end I found a set of "New Old Stock" Blue Thunder "B" heads, that had never been assembled. They were shipped out to Kentucky where they were finished & ported by Charlie Evans,
The "B" offers a strong exhaust port which will come in handy for the supercharged application,
Another good score for this engine was picking up a matching Blue Thunder blower manifold from a buddy of mine that had been stashing it for a while,

Mounted on top of that will be a Littlefield Hi-helix 14-71 retro blower with the "delta" opening, that was rebuilt by TBS in Boise, I'll probably start off with a moderate 20% over drive on the pulleys to get everything going.
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While everything is here to build the engine nothing is assembled just yet, but I did take enough of the "spare parts" & put together a mock up engine to use while building the chassis,
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Discussion Starter #5 (Edited)
I'll try posting the FB videos here, they are all public & anyone should be able to view them,

This was a short clip playing around with the bendtech program, I have never played with the software before, & this build is my first attempt at using it,

https://www.facebook.com/101466641335626/videos/1212834585576215/?modal=admin_todo_tour

After a few hours of playing with Bendtech & learning the basics, I started cutting & bending tube, it did not take long for the tubing pile to get smaller, & a chassis on the table to start taking shape,
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The goal here is not shooting for style points, just brute strength, & hopefully not terribly hard to work on when finished,

The upper main frame rails are 2"x.188", along with s couple of the short vertical tubes that will have components mounted to them, the stringer rail & remaining tubes are 2"x.120"
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The shock hoops are also 2"x.188"
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The frame halves were setup, & squared up, upside down on the table,
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Then tied together in a few areas to keep things in line.
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Discussion Starter #6
With the basics of the main frame rails in place, link mounts were figured out & cut on dads Plasmacam
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The upper link mounts are 3/8 plate, bent in a press brake to get the correct width once welded to the 2" tube,
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The lower mounts use a 1/4" plate welded to the inside & outside of the main belly tubes, this gets the overall width to 2.5" the link tabs are 3/8" plate, & the inner tabs are double bent to get the last 1/8" needed to fit a 2.625" wide joint,
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Between the inner & outer assemblies there is not only a 2" tube, but also a 2" wide x 1/4" bolster strap tying them together,
 

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Discussion Starter #7
The actual skid mount / belly itself is 1/4" plate, the square holes are for battery placement,
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The battery openings were boxed on the top side with 1/4"x2" strap to strengthen the large flat belly,
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The hole pattern around the perimeter of the plate is for the actual skid plate, once finished it will have a 1/2" 6061 aluminum plate bolted to the bottom, & will be what the batteries are actually sitting on,
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Once the belly was mostly weld in, the chassis was pulled from the table, flipped over to right side up, & started planning for powertrain install,
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Discussion Starter #8
Hanging parts in the chassis I'm using a Kieth Fulp aluminum mid plate,
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Along with my own home made front motor plate, got the engine & trans square & level,
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Then figured out the drop box mount I spent most of a day on wasn’t going to work.
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With this plate welded in as planned, there would be no way to pull the transmission without taking the engine out, I already have one rig like that & would prefer to no have another.
 

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Discussion Starter #9
So version 2.0 was drawn up, cut out, & cleaned up, this one bolts to a pair of flanges that are welded to the chassis & after pulling the drop box the whole mount can come out making plenty of room for the trans to come out from under the rig.
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A mount under the transmission also ties into the plate to prevent for/aft movement in that big wide plate.
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Discussion Starter #10
The donor cab comes from a 1973 Ford "super camper special"
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A little over 6 hours to completely gut the interior then remove the front clip & cab,

And not a single metric tool was used,

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A couple more hours cutting out the floor & it was ready to start laying out cab mounts,
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A couple perimeter tubes were bent up & welded on with a couple angled down supports per side doing my best to catch those node points.
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Discussion Starter #11
Some 1.5” x .120 wall square tube was machined up & 4 were welded to each of the perimeter tubes,
Interesting fact, the rockers on 73-79 Fords are tapered from front to back, the rear of the cab being 1” wider than the front.
I chose to make the perimeter tubes, & mounts strait with the chassis, then built spacers in different lengths to make up the difference.
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Once the cab could be bolted on the rest of the fire wall & floor was cut out.
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With the cab bolted in place & floor/fire wall out of the way, it was time to start on the cage,
The B-pillar/hoop is a simple 2”x.188 DOM part, that will be tied into both the perimeter tubes & the main frame rails,
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2”x.120 A-pillars & brow bar were bent up for the front of the cab,
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Discussion Starter #13
Continuing with tube work, lucky for me Chestonscout on here saved me a bunch of time & hauled another pile of tubing out from SLC, then hung out & lent a hand for a bit.
The shock hoops front & rear got an X-brace & down tube,
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Then back inside the dash bar & lower windshield tube were fit in place as well as the center roof tube,
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And with no further need for it, the rest of the dash was cut out.

At this point I was getting somewhat burnt out on tube work & decided I needed a change of pace,
remember earlier in the pics, those fresh sandblasted Axletechs? this is what they look like after a couple winters in the car port,
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Nothing a little flap disc action won't fix up, besides once all the tabs & brackets are done I'll have them blasted again before paint.

To start, the front axle was thrown on the table, de-braked, & cleaned up in the areas I would be working on.

Then all the parts I've been gathering for the axles & steering were drug out to make sure I had everything I needed.
This project will be running all EMF joints, with the exception of the 3/4" rod ends on the shocks.
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Awesome, who doesn't love a monster truck.

I'm sure at some point you will have to get some 66x44s or whatever they actually run. I'm sure they perform terrible compared to what you have, but that's not the point :flipoff2:
 

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Discussion Starter #15
Starting with installing the high steer arms, & getting an idea where I wanted the cylinder, A mount was drawn up in plasmacam, & cut out of 3/8" plate,
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2.5"x10" DE surplus center rams will be used front & rear.
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They required a little bending for fit & strength,
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Discussion Starter #16
Allison weighed in again & chose from a couple different cylinder guards I had drawn up, her choice was cut out, cleaned up, fit & tacked to the cylinder mount,
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All the parts were built two at a time so the rear axle should go pretty quickly

With the steering tacked in place it was time to slide the axle under the chassis, & start figuring shock mounts,

The plasmacam is actually pretty handy for putting some rough measurements into a visual,

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Discussion Starter #17
With a rough idea if what I needed, I designed some lower shock mounts, & cut out a bunch of 3/8” plate parts, I decided the overall width was a bit more than I wanted, so everything was stacked together & machined down just a touch,
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Once I liked the width one part was tacked together & checked fitment,
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Then everything was assembled & welded out for the lower shock mounts.
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Discussion Starter #18
With a known mounting point at the axle, I was able to figure out what was needed on the shock hoops.

For the upper mounts, a 3/8 tab was welded to both sides of the X-brace & down tube, (one in front, one in back, on both sides)
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Those will serve as the inner tab/mount,

For the outer tabs 1/4" plate was laminated together forming a 1/2" thick mounting area,
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The laminated section does not cover the whole mount, just the area where a little extra strength will be useful,
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These parts will span from hoop to hoop, the width of the chassis, tying everything together along with the X-brace.
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thanks for posting here :smokin:
 
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