{"product_id":"carli-unchained-3-5-ram-2500-3500-2012-2013","title":"Carli Suspension Dodge 3\" Unchained 3.5 Long Arm System | 2012–2013 Ram 2500\/3500 Diesel 4WD","description":"\u003ch3\u003eIs This for You?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYou're building a 2012–2013 Ram 2500 or 2012 Ram 3500 Cummins for serious off-road use\u003c\/strong\u003e — and you've already ruled out leveling kits and short-arm lift systems because you understand what binding geometry does to a truck at full droop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYou have a professional shop lined up\u003c\/strong\u003e that can bore coil buckets to 4.5\", weld rear shock mounts to the frame, and install a fabricated long arm crossmember — this is not a driveway build.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYou want King 3.5\" Remote Reservoir fronts and King 3.0\" Bypass rears\u003c\/strong\u003e on a platform with 11.25\" of front travel and 13.0\" of rear travel — and you're not willing to compromise on shock body diameter or bypass tube count to get there.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Result\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3.0\" front lift \/ 1.0\"–2.0\" rear lift with 11.25\" front wheel travel and 13.0\" rear wheel travel.\u003c\/li\u003e\n\u003cli\u003eLong arm conversion at 50% greater length than factory short arms — eliminates the bind and caster deviation that short-arm geometry produces at lift.\u003c\/li\u003e\n\u003cli\u003eKing 3.5\" Remote Reservoir fronts and King 3.0\" 3-Tube\/4-Tube Bypass rears — Carli Unchained-spec valving for Cummins diesel platform weight.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFactory Ram 2500\/3500 short control arms are designed for a specific arc of travel at stock ride height. At 3\" of lift, that arc produces increasing bind through the range of motion — the arm fights the axle instead of guiding it. The Carli long arm system replaces the factory short arms with fabricated units 50% longer, flattening the arc and allowing the axle to articulate through full travel without bind or caster deviation. The King 3.5\" Remote Reservoir shock runs a 3.5\" body diameter — significantly larger oil volume than a 2.0\" or 2.5\" shock — which is why the factory coil buckets must be bored to 4.5\": the shock body physically cannot fit otherwise. This is not a modification that can be skipped or substituted. The King 3.0\" Bypass rear shocks use position-sensitive bypass tubes to deliver a compliant initial stroke for on-road use and a progressively stiffer rate as the shock approaches full compression — the 3-tube and 4-tube configurations differ in bypass circuit count and are spec'd by Carli for this platform. FSP valving throughout is calibrated for Cummins diesel front axle weight — running this system on a gas-engine Ram will produce an oversprung, overly stiff ride that degrades both on-road comfort and off-road control.\u003c\/p\u003e\u003ch3\u003eAudit Table\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eCS-DUC35-12-D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLift Height\u003c\/td\u003e\n\u003ctd\u003e3.0\" Front \/ 1.0\"–2.0\" Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Wheel Travel\u003c\/td\u003e\n\u003ctd\u003e11.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Wheel Travel\u003c\/td\u003e\n\u003ctd\u003e13.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Shock\u003c\/td\u003e\n\u003ctd\u003eKing 3.5\" Remote Reservoir — Carli Unchained-Spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Shock\u003c\/td\u003e\n\u003ctd\u003eKing 3.0\" 3-Tube\/4-Tube Bypass — Carli Unchained-Spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLong Arm Length\u003c\/td\u003e\n\u003ctd\u003e50% Longer Than Factory Short Arms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoil Springs\u003c\/td\u003e\n\u003ctd\u003e3\" Linear-Rate Front (CS-DMRC-10-D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrack Bar\u003c\/td\u003e\n\u003ctd\u003eAdjustable (CS-DATB-03) with Drop Bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrake Lines\u003c\/td\u003e\n\u003ctd\u003eStainless Steel Braided — Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Tire\u003c\/td\u003e\n\u003ctd\u003e37\"x12.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Wheel\u003c\/td\u003e\n\u003ctd\u003e17\"–18\" | 9\" Wide | 5.0\"–5.25\" Backspacing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e~450 lbs — Multiple Heavy Pallets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eKit Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFabricated Long Arm System \u0026amp; Crossmember (CS-DLAM-03)\u003c\/li\u003e\n\u003cli\u003eKing 3.5\" Front \/ 3.0\" Bypass Rear Shock Package (CS-DUC35SPKG-3-12-D)\u003c\/li\u003e\n\u003cli\u003eFabricated Shock Towers — Slide-Over Design (CS-DFST525)\u003c\/li\u003e\n\u003cli\u003e3\" Linear-Rate Front Coil Springs (CS-DMRC-10-D)\u003c\/li\u003e\n\u003cli\u003eAdjustable Track Bar (CS-DATB-03)\u003c\/li\u003e\n\u003cli\u003eTrack Bar Drop Bracket (CS-DPRBDROP-10)\u003c\/li\u003e\n\u003cli\u003eStainless Steel Braided Brake Lines (CS-DBBL-12-D)\u003c\/li\u003e\n\u003cli\u003eFront Bump Stop Drops (CS-DFBD-1)\u003c\/li\u003e\n\u003cli\u003eFabricated Rear Shock Mounts \u0026amp; Gussets — Weld-On (CS-DRSMKIT-03)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eVerified Fitment\u003c\/h3\u003e\u003cp\u003e✔ \u003cstrong\u003e2012–2013 Ram 2500 4WD — Cummins Diesel\u003c\/strong\u003e\u003cbr\u003e✔ \u003cstrong\u003e2012 Ram 3500 SRW 4WD — Cummins Diesel\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e 2013 Ram 3500 — not listed in Carli application data\u003cbr\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e Ram 2500\/3500 Gas engines — spring rates and shock valving calibrated for Cummins diesel front axle weight\u003cbr\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e Ram 3500 DRW (Dually) — SRW geometry only\u003cbr\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e 2WD Ram 2500\/3500\u003cbr\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e 2003–2009 or 2014–2026 Ram 2500\/3500 — different suspension architecture; see generation-specific Carli kits\u003cbr\u003e✘ \u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e Ram 1500 — incompatible platform\u003c\/p\u003e\u003ch3\u003eTransmission Clearance Note\u003c\/h3\u003e\u003cp\u003eVerify transmission type before ordering. High Output (Aisin) vs. Standard (68RFE) transmissions may have crossmember clearance differences with the long arm crossmember. Confirm with your installer prior to purchase.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Bucket Boring:\u003c\/strong\u003e Factory spring buckets MUST be bored to 4.5\" to clear King 3.5\" shock bodies. This is a non-reversible fabrication step — professional shop required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear Shock Mounts:\u003c\/strong\u003e Weld-on installation. CS-DRSMKIT-03 requires professional frame welding. This is not a bolt-on application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Arm Crossmember:\u003c\/strong\u003e Requires professional alignment of mounting geometry during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorsion Sway Bar:\u003c\/strong\u003e This system is optimized for the Carli Torsion Sway Bar. Running factory sway bar links will severely limit suspension travel and compromise system performance.\u003c\/li\u003e\n\u003cli\u003eFull front-end alignment mandatory post-installation. Long arm geometry changes caster, camber, and toe.\u003c\/li\u003e\n\u003cli\u003eTorque all fasteners to Carli specification. Re-torque all suspension fasteners at 500-mile break-in interval.\u003c\/li\u003e\n\u003cli\u003eProfessional installation required throughout — long arm fabrication, coil bucket boring, and weld-on rear mounts are not DIY operations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eLTL Freight Notice:\u003c\/strong\u003e This item ships via freight carrier on multiple heavy pallets due to size and weight (~450 lbs). Residential delivery is included. Freight carrier will contact you to schedule delivery.\u003c\/p\u003e\u003cblockquote\u003e\n\u003cstrong\u003eEngineering Question:\u003c\/strong\u003e Have you confirmed your transmission type (Aisin vs. 68RFE), coil bucket boring capability at your shop, weld-on rear shock mount access, and Carli Torsion Sway Bar sourcing? This is a fabrication-level build on a narrow application window — 2012–2013 Ram 2500 and 2012 Ram 3500 Cummins 4WD only. Confirm your full build plan and shop capabilities before ordering.\u003c\/blockquote\u003e","brand":"Carli Suspension","offers":[{"title":"Default Title","offer_id":51417396937025,"sku":"CS-DUC35-12-D","price":13728.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/1284\/1793\/files\/CISCS-DUC35-12-D.webp?v=1772024550","url":"https:\/\/obsidianforgedautosupply.com\/products\/carli-unchained-3-5-ram-2500-3500-2012-2013","provider":"Obsidian Forged Auto Supply","version":"1.0","type":"link"}