{"product_id":"usa-standard-ring-pinion-gm-8-5-3-73-ratio","title":"USA Standard Ring \u0026 Pinion Gear Set For GM 8.5in in a 3.73 Ratio","description":"\u003ch4\u003eUSA Standard Ring and Pinion Gear Set for GM 8.5in - 3.73 Ratio\u003c\/h4\u003e\n\u003cp\u003eThe USA Standard ZG GM8.5-373 is a precision-machined ring and pinion gear set engineered for the GM 8.5-inch 10-bolt rear differential. The ZG GM8.5-373 provides a 3.73:1 final drive ratio that is one of the most popular street and mild off-road ratios for full-size Chevy and GMC trucks and SUVs. Every ZG GM8.5-373 set is manufactured from high-alloy steel with controlled heat-treatment profiles that exceed OEM dimensional and material specifications. USA Standard Gear applies rigorous in-house quality evaluation to each ZG GM8.5-373 set covering tooth contact pattern, dimensional accuracy, and material hardness before shipment. The ZG GM8.5-373 is a direct replacement for any vehicle equipped with the GM 8.5in 10-bolt rear end and is backed by a lifetime limited warranty from Yukon Gear and Axle under the Magnuson-Moss Warranty Act.\u003c\/p\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Ring gear (GM 8.5in, 3.73 ratio)\u003c\/li\u003e\n\u003cli\u003e1 x Pinion gear\u003c\/li\u003e\n\u003cli\u003eRing gear bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFeatures and Benefits\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e3.73:1 ratio ideal for towing, off-roading, and performance builds\u003c\/li\u003e\n\u003cli\u003eHigh-alloy steel with advanced heat treatment for maximum durability\u003c\/li\u003e\n\u003cli\u003eExceeds OEM dimensional specifications for proper meshing and longevity\u003c\/li\u003e\n\u003cli\u003eFits 10-bolt GM 8.5in and 8.6in differentials\u003c\/li\u003e\n\u003cli\u003e41 ring gear teeth, 11 pinion teeth, 30-spline pinion\u003c\/li\u003e\n\u003cli\u003eLifetime limited warranty under Magnuson-Moss Warranty Act\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\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 (MPN)\u003c\/td\u003e\n\u003ctd\u003eZG GM8.5-373\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAxle Application\u003c\/td\u003e\n\u003ctd\u003eGM 8.5in \/ 8.6in 10-bolt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear Ratio\u003c\/td\u003e\n\u003ctd\u003e3.73:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRing Gear Teeth\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePinion Teeth\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePinion Spline\u003c\/td\u003e\n\u003ctd\u003e30-spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePinion Diameter\u003c\/td\u003e\n\u003ctd\u003e1.625 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e883584241584\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eThe ZG GM8.5-373 fits vehicles equipped with the GM 8.5in or 8.6in 10-bolt rear differential, including 1977-1998 Chevrolet C\/K 1500 and 2500, 1977-1998 GMC C\/K 1500 and 2500, 1992-1999 Chevrolet Suburban and Tahoe, 1992-1999 GMC Yukon and Sierra, and select Camaro and Corvette applications. Always verify your axle tube diameter and carrier bore size before ordering.\u003c\/p\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill ZG GM8.5-373 work in both the 8.5in and 8.6in differentials?\u003c\/strong\u003e Yes. The GM 8.6in is the later version of the 8.5in housing and uses the same ring and pinion size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo I need a new install kit with ZG GM8.5-373?\u003c\/strong\u003e Yes. Always pair a ring and pinion replacement with a fresh master overhaul kit for proper preload and backlash settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill this ratio work with 35-inch tires?\u003c\/strong\u003e The 3.73 ratio works well with up to 35-inch tires on most GM truck platforms while maintaining reasonable highway fuel economy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs ZG GM8.5-373 a standard or reverse-cut gear?\u003c\/strong\u003e ZG GM8.5-373 is a standard-rotation gear set as found in the factory rear axle application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes this include a carrier?\u003c\/strong\u003e No. ZG GM8.5-373 is a ring and pinion set only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs professional installation required?\u003c\/strong\u003e Professional installation is strongly recommended. Gear installation requires precise shimming and backlash adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the warranty on ZG GM8.5-373?\u003c\/strong\u003e Lifetime limited warranty from Yukon Gear and Axle under the Magnuson-Moss Warranty Act.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes ZG GM8.5-373 require a carrier swap?\u003c\/strong\u003e Depending on your current ratio, you may need a different carrier. Consult your axle specs before ordering.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003cp\u003eRemove the differential cover and drain gear oil. Remove the carrier, pinion, and old gear set. Set new pinion depth using ZG GM8.5-373 pinion and appropriate shims. Install the ring gear on the carrier and torque ring gear bolts to specification. Adjust backlash to 0.008-0.012 inches. Verify tooth contact pattern with marking compound before final assembly. Refill with appropriate gear oil.\u003c\/p\u003e\n\n\u003ch4\u003eProp 65 Notice\u003c\/h4\u003e\n\u003cp\u003eThis product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"Yukon Gear \u0026 Axle","offers":[{"title":"Default Title","offer_id":45974398238799,"sku":"YUKZG GM8.5-373","price":226.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/GM_8.5in_Ring_Pinion_3.73_Ratio.jpg?v=1782658407","url":"https:\/\/www.blackopsautoworks.com\/products\/usa-standard-ring-pinion-gm-8-5-3-73-ratio","provider":"Black Ops Auto Works","version":"1.0","type":"link"}