{"product_id":"hpi-racing-40-tooth-spool-set-optional-locked-diff-upgrade-for-rs4-sport-3","title":"HPI Racing 40 Tooth Spool Set – Optional Locked Diff Upgrade for RS4 Sport 3","description":"\u003cdiv\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHPI Racing 40 Tooth Spool Set\u003c\/strong\u003e is an optional drivetrain upgrade for the HPI RS4 Sport 3, replacing the standard differential with a locked spool for maximum drive efficiency. A spool delivers 100% power transfer to both wheels — ideal for drift, drag, and certain racing applications where consistent traction is more important than diff-style cornering behavior.\u003c\/p\u003e\n\u003cp\u003ePrecision-machined for smooth meshing and rugged construction, this upgrade is a popular choice for drift builders and racers wanting more direct power delivery.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine HPI Racing optional upgrade\u003c\/li\u003e\n\u003cli\u003eLocked spool design (no differential action)\u003c\/li\u003e\n\u003cli\u003e40-tooth gear count\u003c\/li\u003e\n\u003cli\u003ePrecision-machined construction\u003c\/li\u003e\n\u003cli\u003eDirect fit for RS4 Sport 3\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaximum power transfer to both drive wheels\u003c\/li\u003e\n\u003cli\u003ePredictable handling for drift applications\u003c\/li\u003e\n\u003cli\u003eEliminates inside-wheel slip during launches\u003c\/li\u003e\n\u003cli\u003eIncreased drive efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUsage Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSpools are best for drift, drag, and stadium racing\u003c\/li\u003e\n\u003cli\u003eReduces cornering ability vs. standard differential\u003c\/li\u003e\n\u003cli\u003eRecommended for advanced drivers\u003c\/li\u003e\n\u003cli\u003eUse with appropriate tire compounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e HPI Racing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 114436\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth Count:\u003c\/strong\u003e 40T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Locked Spool\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Optional Upgrade\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHPI RS4 Sport 3\u003c\/li\u003e\n\u003cli\u003eHPI RS4 Sport 3 Hoonicorn\u003c\/li\u003e\n\u003cli\u003eHPI RS4 Sport 3 BMW M3 E30\u003c\/li\u003e\n\u003cli\u003eRS4 Sport 3 variants and licensed editions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x 40 Tooth Spool Set (RS4 Sport 3 Opt)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSummary\u003c\/h3\u003e\n\u003cp\u003eLock in maximum drive efficiency with the HPI Racing 40T Spool Set for your RS4 Sport 3. The perfect choice for drifters and drag racers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"RC Hop Up Parts","offers":[{"title":"Default Title","offer_id":42816522715230,"sku":"HPI114436","price":41.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/2929\/1614\/files\/hpi114436_e1b20189-c4f3-4f5e-8f64-a76e2fc74d37.jpg?v=1779937665","url":"https:\/\/nez-emporium.com\/products\/hpi-racing-40-tooth-spool-set-optional-locked-diff-upgrade-for-rs4-sport-3","provider":"Nez Emporium","version":"1.0","type":"link"}