{"product_id":"8-8-ford-billet-main-cap","title":"Mark Williams Billet Main Cap Ford 8.8 Steel — Fits Ford 8.8 Rear-End","description":"\u003cdiv style=\"background:#f7f7f7;border-left:4px solid #c00000;padding:14px 18px;margin:0 0 18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;font-size:1.1em;\"\u003eAbout Mark Williams\u003c\/h3\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.55;\"\u003eMark Williams engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Mark Williams lineup with fast shipping and expert fitment support — order with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin:24px 0 8px;\"\u003eWatch in action\u003c\/h3\u003e\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:0 0 18px;border-radius:6px;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/cmi-gJF-uxg\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen loading=\"lazy\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003ch2\u003eSuperior Strength for Ford 8.8 Differentials\u003c\/h2\u003e\u003cp\u003eWhen pushing your vehicle to the limit, the factory main caps on a Ford 8.8 rear-end can become a point of failure. The \u003cstrong\u003eMark Williams Billet Main Cap\u003c\/strong\u003e is engineered to provide the structural rigidity required for high-horsepower applications and aggressive drag racing. Precision-machined from premium steel and finished in a durable black oxide coating, this cap ensures your differential remains stable under extreme torque loads.\u003c\/p\u003e\u003ch3\u003eKey Technical Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eConstructed from high-grade billet steel for superior fatigue resistance\u003c\/li\u003e\n\u003cli\u003eDirect replacement for factory Ford 8.8 main caps\u003c\/li\u003e\n\u003cli\u003eIncludes high-strength hardware for a secure, reliable installation\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish prevents corrosion and oxidation\u003c\/li\u003e\n\u003cli\u003eDesigned for precise fitment in performance rear-end builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you are upgrading your street strip machine or a dedicated track car, these billet caps offer the peace of mind that comes with professional-grade engineering. By reinforcing the carrier housing, you prevent cap walk and protect your ring and pinion gears from premature wear or catastrophic failure. Installation is straightforward for those familiar with differential rebuilds, making this an essential upgrade for any serious enthusiast looking to improve drivetrain reliability. Trust GGCRACING to provide the high-performance components you need to keep your vehicle performing at its peak on the strip or the street.\u003c\/p\u003e\n\u003cdiv style=\"margin:24px 0;border-top:1px solid #eee;padding-top:18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOften bought with\u003c\/h3\u003e\n\u003cp style=\"font-size:0.9em;color:#555;margin:0 0 8px;\"\u003eOther popular Mark Williams products customers consider together:\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/quick-rel-steering-hub\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams Quick Release Steering Hub 3\/4in Shaft — 4-Bolt Wheel\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/gt-5-bolt-quick-release\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams GT 5-Bolt Quick Release - Grant GT 3\/4in Shaft — Black Anodized Aluminum\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/q-r-steering-hub-6-hole-sparco-momo-str-wheels\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams SFI 42.1 Quick Release Hub — Fits Sparco\/Momo 6-Hole\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/gm-8-5-10-pinion-yoke\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams 1350 U-Joint Pinion Yoke — GM 8.5\" 10-Bolt, 30 Spline\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/th400-t-10-trans-yoke\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams TH400 T-10 Slip Yoke 32 Spline — 1350 U-Joint\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"Mark Williams Billet Main Cap Ford 8.8 Steel \\u2014 Fits Ford 8.8 Rear-End\",\"description\":\"Upgrade your Ford 8.8 rear-end with the Mark Williams Billet Main Cap. 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Contact our experts at GGCRACING with your VIN and we'll verify before you order.\"}},{\"@type\":\"Question\",\"name\":\"How long is shipping for Mark Williams?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.\"}},{\"@type\":\"Question\",\"name\":\"How do I install the Mark Williams Billet Main Cap Ford 8.8 Steel \\u2014 Fits Ford 8.8 Rear-End?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most installs are bolt-on with basic hand tools. 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