{"product_id":"spool-performance-zf-8hp45-8hp50-8hp51-billet-300m-c-hub-cog-drive","title":"SPOOL PERFORMANCE ZF 8HP45 \/ 8HP50 \/ 8HP51 BILLET 300M C-HUB COG DRIVE","description":"\u003ch2 data-start=\"0\" data-end=\"47\"\u003eSpool Performance ZF 8HP45 \/ 8HP50 \/ 8HP51 Billet 300M C-Hub Cog Drive\u003c\/h2\u003e\n\u003ch3 data-start=\"48\" data-end=\"79\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp data-start=\"81\" data-end=\"497\"\u003eThe factory C-hub cog drive in ZF 8HP45, 8HP50, and 8HP51 transmissions is produced from cast steel. While adequate at stock power levels, casting brings inherent weaknesses—porosity, uneven grain structure, and localized stress points—that are exposed as torque output, line pressure, and shift aggression increase. Common failure modes include \u003cstrong data-start=\"427\" data-end=\"496\"\u003ecog tooth deformation, spline wear, and cracking under shock load\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"499\" data-end=\"671\"\u003eSpool Performance replaces the factory casting with a \u003cstrong data-start=\"553\" data-end=\"603\"\u003efully CNC-machined billet 300M C-Hub Cog Drive\u003c\/strong\u003e, engineered specifically for high-torque and high-RPM applications.\u003c\/p\u003e\n\u003cp data-start=\"673\" data-end=\"1020\"\u003e300M is an ultra-high-strength, vacuum-melted alloy steel used in aerospace and motorsports driveline components. Compared to cast steel, billet 300M offers \u003cstrong data-start=\"830\" data-end=\"947\"\u003edramatically higher strength, superior fatigue resistance, and consistent material properties throughout the part\u003c\/strong\u003e, ensuring it can survive repeated clutch apply events and hard launches.\u003c\/p\u003e\n\u003cp data-start=\"1022\" data-end=\"1230\"\u003eEach hub is precision-machined to tight tolerances for accurate cog geometry and even load distribution, resulting in \u003cstrong data-start=\"1140\" data-end=\"1229\"\u003ecleaner torque transfer, reduced stress concentration, and improved shift consistency\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"1232\" data-end=\"1438\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eFor any 8HP45\/50\/51 build running increased power, upgraded clutches, or elevated line pressure, the Spool Performance Billet 300M C-Hub Cog Drive is a \u003cstrong data-start=\"1384\" data-end=\"1416\"\u003ecritical reliability upgrade\u003c\/strong\u003e, not an optional one.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"Default Title","offer_id":47603213467906,"sku":"SP-8HP5X-UCD","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0266\/5450\/7191\/files\/1_787e0a1a-b232-403c-b575-5b5d204fed4e_png.avif?v=1774896346","url":"https:\/\/euroklasse.com\/products\/spool-performance-zf-8hp45-8hp50-8hp51-billet-300m-c-hub-cog-drive","provider":"EuroKlasse INC","version":"1.0","type":"link"}