{"product_id":"fst-np241-doubler-kit","title":"FST NP241 Doubler Kit — Dual Transfer Case Adapter | Squarebody Crawler Builds","description":"\u003cp\u003e\u003cstrong\u003eStack two NP241s and gear down for the rocks — the doubler kit that turns your transfer case into a crawl box setup.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is the FST (Froehlich Suspension Technology) NP241 doubler kit, the adapter setup that joins a second NP241 range box in front of your main NP241 transfer case. The result is a dual-case \"doubler\" — you keep your normal high range and low range, and gain a double-low that stacks both cases' reductions. With the NP241's 2.72:1 low range doubled, you're looking at roughly 7.4:1 out of the transfer cases alone, before your transmission and axle gears even enter the math.\u003c\/p\u003e\n\u003cp\u003eThat's real crawl gearing — walk your Squarebody over obstacles at idle speed with total control, then shift back to 1:1 and drive it home. The NP241 is a favorite foundation for this build for good reason: strong aluminum case and a 6-pinion planetary that holds up to the multiplied torque. If you're building a K-series crawler and want doubler gearing without the price of an aftermarket crawl box, this is the kit.\u003c\/p\u003e\n\u003ch3\u003eBuilt For\u003c\/h3\u003e\n\u003cp\u003eThis kit is designed specifically for \u003cstrong\u003eSquarebody Chevy\/GMC trucks\/blazers\/suburbans\u003c\/strong\u003e, in the following configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront donor case:\u003c\/strong\u003e driver drop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear main case:\u003c\/strong\u003e passenger drop\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAfter You Order\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWe reach out by email after every purchase\u003c\/strong\u003e to verify your spline\/quantity count and confirm which transfer cases you're running before anything ships. This makes sure you get the correct kit for your exact build — no guessing, no wrong parts.\u003c\/p\u003e\n\u003ch3\u003eWhy It Works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal crawl gearing\u003c\/strong\u003e — double-low stacks both cases for roughly 7.4:1 reduction from the transfer cases alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeeps street manners\u003c\/strong\u003e — shift to 1:1 high range and drive it like normal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt on the NP241\u003c\/strong\u003e — strong aluminum case, 6-pinion planetary, proven under multiplied torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart money\u003c\/strong\u003e — doubler gearing for a fraction of an aftermarket crawl box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Squarebody crawler move\u003c\/strong\u003e — the drivetrain upgrade serious K-series builds run.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat You Need To Know\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdapter kit to run a \u003cstrong\u003edual NP241 (doubler)\u003c\/strong\u003e setup — you supply the transfer cases (your main NP241 plus a donor for the range box).\u003c\/li\u003e\n\u003cli\u003eConfigured for a \u003cstrong\u003edriver-drop front donor case\u003c\/strong\u003e and a \u003cstrong\u003epassenger-drop rear main case\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eBuilt specifically for \u003cstrong\u003eSquarebodies with the 700R4 transmission\u003c\/strong\u003e. Running a different transmission? You may need to change the transfer case input shaft, may require different transmission-to-transfer-case mounting adapters, and will need a different — or modified — transmission crossmember.\u003c\/li\u003e\n\u003cli\u003eThis is a fabrication-level drivetrain build regardless: plan on crossmember work, driveshaft length changes, and a dual-case shifter setup.\u003c\/li\u003e\n\u003cli\u003ePairs with our \u003cstrong\u003eJB Custom Fab BBOR-Spec Dual NP241 Transfer Case Shifter\u003c\/strong\u003e for clean twin-stick control of both cases.\u003c\/li\u003e\n\u003cli\u003ePrice is $550 — shipping calculated at checkout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlanning a doubler build and want to talk through what your setup needs? Text 530-327-8811 or email blazinbiddlesoffroad@gmail.com before you order — happy to walk through it.\u003c\/em\u003e\u003c\/p\u003e","brand":"FST","offers":[{"title":"Default Title","offer_id":46721623425223,"sku":null,"price":550.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/7275\/5399\/files\/FSTDoubler.png?v=1783024000","url":"https:\/\/blazinbiddlesoffroad.com\/products\/fst-np241-doubler-kit","provider":"Blazin BIddles Off-Road","version":"1.0","type":"link"}