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Drives the open-source release.",[129,137,142],{"icon":138,"title":139,"target":140,"to":141},"i-lucide-ruler","Johannes Dobsch — Mechanical engineer","_blank","https:\u002F\u002Fdobschpke.com",[93,143,144,145,149],{},"Owns the sub-frame architecture, kinematic analysis of the zero-torsion pivot system, structural validation, and weld specification.\n",[146,147,148],"strong",{},"dobschpke.com"," ↗",[129,151,155],{"icon":152,"title":153,"target":140,"to":154},"i-lucide-flame","FabCo — Fabricator","https:\u002F\u002Fwww.fabcosteel.com\u002F",[93,156,157,158,149],{},"Cuts, welds, and finishes the sub-frame to AWS D1.1 from the engineering pack. First production source for the F-550 reference build.\n",[146,159,160],{},"fabcosteel.com",[129,162,166],{"icon":163,"title":164,"target":140,"to":165},"i-lucide-wrench","Mav Conversions — Installer","https:\u002F\u002Fwww.escoauto.com\u002F",[93,167,168,169,149],{},"Converted the truck to 41\" super singles (Buckstop conversion), mounts the finished sub-frame to the truck per the install guide, and feeds back any geometry or fit findings into the next revision.\n",[146,170,171],{},"escoauto.com",[173,174],"hr",{},[105,176,178],{"id":177},"truck","Truck",[180,181,182,195],"table",{},[183,184,185],"thead",{},[186,187,188,192],"tr",{},[189,190,191],"th",{},"Parameter",[189,193,194],{},"Value",[196,197,198,207,215,223,231],"tbody",{},[186,199,200,204],{},[201,202,203],"td",{},"Vehicle",[201,205,206],{},"2024 Ford F-550 XLT 4WD Crew Cab",[186,208,209,212],{},[201,210,211],{},"Engine",[201,213,214],{},"7.3L Godzilla V8 Gas",[186,216,217,220],{},[201,218,219],{},"Wheelbase",[201,221,222],{},"203\"",[186,224,225,228],{},[201,226,227],{},"GVWR",[201,229,230],{},"18,000 lbs",[186,232,233,236],{},[201,234,235],{},"CA Dimension",[201,237,238],{},"84.0\"",[173,240],{},[105,242,244],{"id":243},"suspension","Suspension",[180,246,247,255],{},[183,248,249],{},[186,250,251,253],{},[189,252,191],{},[189,254,194],{},[196,256,257,265,273,284,292],{},[186,258,259,262],{},[201,260,261],{},"System",[201,263,264],{},"LiquidSpring FS4L active hydraulic",[186,266,267,270],{},[201,268,269],{},"Rear Lift",[201,271,272],{},"4\"",[186,274,275,278],{},[201,276,277],{},"Rear Jounce",[201,279,280,281],{},"3.9\" — ",[146,282,283],{},"critical clearance dimension",[186,285,286,289],{},[201,287,288],{},"Rear Rebound",[201,290,291],{},"4.0\"",[186,293,294,297],{},[201,295,296],{},"Kneeling Drop",[201,298,272],{},[173,300],{},[105,302,304],{"id":303},"tires","Tires",[180,306,307,315],{},[183,308,309],{},[186,310,311,313],{},[189,312,191],{},[189,314,194],{},[196,316,317,325,333,341,349],{},[186,318,319,322],{},[201,320,321],{},"Tire",[201,323,324],{},"Continental MPT 335\u002F80R20",[186,326,327,330],{},[201,328,329],{},"Diameter",[201,331,332],{},"41\" at highway pressure",[186,334,335,338],{},[201,336,337],{},"Width",[201,339,340],{},"335mm at highway pressure",[186,342,343,346],{},[201,344,345],{},"Minimum Pressure",[201,347,348],{},"25 PSI",[186,350,351,354],{},[201,352,353],{},"Conversion",[201,355,356],{},"Buckstop super single",[93,358,359],{},"The tire swept volume at 25 PSI through full 3.9\" jounce defines the geometric exclusion zone. No sub-frame structure enters this zone. Minimum 25mm clearance margin beyond the envelope at all points.",[173,361],{},[105,363,365],{"id":364},"mount-system","Mount System",[93,367,368],{},"Three-point zero-torsion. Statically determinate.",[93,370,371],{},[146,372,373],{},"Front — one lateral pivot:",[375,376,377,381,384,387,390],"ul",{},[378,379,380],"li",{},"Allows rotation on the lateral axis only",[378,382,383],{},"Pin: 4140 chrome-moly ground shaft",[378,385,386],{},"Bushing: SAE 841 oil-impregnated bronze sleeve",[378,388,389],{},"Brackets: A36 steel plate — welded to sub-frame",[378,391,392],{},"Adapter plate: bolts to truck frame via factory holes",[93,394,395],{},[146,396,397],{},"Rear — two fixed mounts:",[375,399,400,403,406],{},[378,401,402],{},"No rotation",[378,404,405],{},"One each side",[378,407,408],{},"Adapter plates using factory Ford body mounting holes",[93,410,411],{},[146,412,413],{},"Chassis drilling rules:",[375,415,416,419,422],{},[378,417,418],{},"U-bolt and shear plate assemblies per Ford Body Builder Guidelines",[378,420,421],{},"Factory body mounting holes only — no new flange holes",[378,423,424],{},"LiquidSpring web drilling: Ø21\u002F32\" — web only — per installation manual",[173,426],{},[105,428,430],{"id":429},"key-constraints","Key Constraints",[93,432,433,436],{},[146,434,435],{},"Deck height:"," Maximum 5\" above frame rail top surface. Hard limit.",[93,438,439,442],{},[146,440,441],{},"Tire clearance:"," All structure outside the swept volume envelope with 25mm margin. No exceptions.",[93,444,445,448],{},[146,446,447],{},"Chassis mounting:"," No new holes in top or bottom frame flanges under any circumstances.",[173,450],{},[105,452,454],{"id":453},"structure","Structure",[375,456,457,460,463,466],{},[378,458,459],{},"Main rails: ASTM A500 Grade C HSS — size per engineer",[378,461,462],{},"Crossmembers: ASTM A500 Grade C — regular spacing",[378,464,465],{},"Outriggers: extend beyond main rails for body attachment",[378,467,468],{},"Adapter plates: ASTM A36 plate",[93,470,471],{},"AWS D1.1 certified welders required. Full penetration welds at all primary joints. All welds inspected before coating.",[173,473],{},[105,475,477],{"id":476},"built-in-provisions","Built-in Provisions",[375,479,480,483,486,489],{},[378,481,482],{},"DOT air line routing — 1\u002F4\" OD PA12 nylon — P-clip mounted every 12-18\"",[378,484,485],{},"Two air outlets mid-frame — one each side — 1\u002F4\" NPT for Milton S-1750",[378,487,488],{},"License plate bracket — centered rear",[378,490,491],{},"Wiring conduit provisions for tail lights and body electronics",[173,493],{},[105,495,497],{"id":496},"coating","Coating",[499,500,501,504,507],"ol",{},[378,502,503],{},"Blast clean to bare metal — Sa 2.5",[378,505,506],{},"Mask all bolt holes, threads, mounting surfaces",[378,508,509],{},"Line-X applied directly to bare blasted steel",[173,511],{},[105,513,515],{"id":514},"changelog","Changelog",[180,517,518,531],{},[183,519,520],{},[186,521,522,525,528],{},[189,523,524],{},"Version",[189,526,527],{},"Date",[189,529,530],{},"Description",[196,532,533],{},[186,534,535,538,541],{},[201,536,537],{},"v0.1",[201,539,540],{},"2026-04",[201,542,543],{},"Initial specification — truck, suspension, tire, and mount system defined",[173,545],{},[105,547,549],{"id":548},"reference-documents","Reference Documents",[375,551,552,555,558],{},[378,553,554],{},"Ford Body Builder Layout Book — 2024 F-450\u002FF-550\u002FF-600",[378,556,557],{},"LiquidSpring Installation Manual — D12348 FSeries FS4L Rev AH",[378,559,560],{},"LiquidSpring Tear Sheets — MK5227, MK5034",{"title":562,"searchDepth":563,"depth":563,"links":564},"",2,[565,569,570,571,572,573,574,575,576,577,578],{"id":107,"depth":563,"text":108,"children":566},[567],{"id":123,"depth":568,"text":124},3,{"id":177,"depth":563,"text":178},{"id":243,"depth":563,"text":244},{"id":303,"depth":563,"text":304},{"id":364,"depth":563,"text":365},{"id":429,"depth":563,"text":430},{"id":453,"depth":563,"text":454},{"id":476,"depth":563,"text":477},{"id":496,"depth":563,"text":497},{"id":514,"depth":563,"text":515},{"id":548,"depth":563,"text":549},"F-550 Crew Cab 203\" Wheelbase — Zero-Torsion Subframe","md",null,{},{"title":44},{"title":585,"description":586},"Ford F-550 Flatbed Sub-frame Build | OpenOverland","Open-source, fabrication-ready zero-torsion sub-frame for the 2024 Ford F-550 Crew Cab 203\" wheelbase. LiquidSpring suspension, super single tires. Free to build.","MXspvUK7fUDf1edUpoPIHkwZUsinpXl_Y9UBQTZpIVY",[589,591],{"title":34,"path":35,"stem":36,"description":590,"children":-1},"OpenOverland is a fully open project.",{"title":44,"path":47,"stem":48,"description":562,"children":-1},1783042607466]