{"product_id":"aam-120t1342gearkit-ring-pinion-kit-gm-12-0-3-42-ratio","title":"AAM 120T1342GEARKIT Ring \u0026 Pinion Kit, GM 12.0\" 3.42 Ratio","description":"\u003cp\u003eBuilt for GM 2500 HD and 3500 HD trucks with the 12.0\" 14-bolt rear axle, this American Axle \u0026amp; Manufacturing 120T1342GEARKIT delivers a 3.42 gear ratio ring and pinion set matched to factory specifications. The kit bundles everything needed for a complete rear differential gear swap: pinion nut, pinion shim, pinion seal, and crush collar alongside the 41-tooth ring gear and 12-tooth pinion gear with 32-spline fitment. Covering Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD models from 2019 through 2025, including 6.6L L5P Diesel, 6.6L L8T, and 6.0L L96 engine applications, this AAM gearset is designed as a direct component-level replacement for rear axle service. Whether you're restoring towing capability or addressing worn gear noise, this kit provides the core hardware in one package rather than requiring separate part sourcing.\u003c\/p\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\u003cp\u003eRing and Pinion Kit, GM 12.0 in., 3.42 Ratio, 19-25. This kit includes Pinion Nut, Pinion Shim, Pinion Seal, Crush Collar and gear Set.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003eComplete kit bundles ring gear, pinion gear, nut, shim, seal, and crush collar in one box\u003c\/li\u003e\n  \u003cli\u003e3.42 gear ratio matched to GM 12.0\" 14-bolt rear axle applications\u003c\/li\u003e\n  \u003cli\u003e41-tooth ring gear and 12-tooth, 32-spline pinion gear for correct axle mesh\u003c\/li\u003e\n  \u003cli\u003eCovers 2019-2025 Silverado and Sierra 2500\/3500 HD across diesel and gas engines\u003c\/li\u003e\n  \u003cli\u003ePremium-grade gearset designed for direct rear differential service and replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplication Summary\u003c\/h3\u003e2019 Chevrolet Silverado 3500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e2019 GMC Sierra 2500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e2019-2020, 2023-2024 Chevrolet Silverado 2500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL\u003cbr\u003e2019-2020, 2023-2024 GMC Sierra 3500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL\u003cbr\u003e2020, 2023-2024 Chevrolet Silverado 3500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL\u003cbr\u003e2020, 2023-2024 GMC Sierra 2500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL\u003cbr\u003e2021-2022, 2025 Chevrolet Silverado 2500 HD 6.6L 6571CC 401CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e2021-2022, 2025 Chevrolet Silverado 3500 HD 6.6L 6571CC 401CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e2021-2022, 2025 GMC Sierra 2500 HD 6.6L 6571CC 401CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e2021-2022, 2025 GMC Sierra 3500 HD 6.6L 6571CC 401CID V8 OHV 16 Valve Naturally Aspirated GAS\u003cbr\u003e\n\u003cdiv class=\"-partnumber\"\u003ePart Numbers: 120T1342GEARKIT\u003c\/div\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e American Axle \u0026amp; Manufacturing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 120T1342GEARKIT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Differential Ring and Pinion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00840382500473\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 13.0000 x 13.0000 x 8.0000 IN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Weight:\u003c\/strong\u003e 43.0000 PG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1 BX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCover Bolt Quantity:\u003c\/strong\u003e 14\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGear Ratio:\u003c\/strong\u003e 3.42\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrade Type:\u003c\/strong\u003e Premium\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePinion Gear Tooth Quantity:\u003c\/strong\u003e 12\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty\u003c\/h3\u003e\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty Type:\u003c\/strong\u003e Limited\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty Duration:\u003c\/strong\u003e 1 Years\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty Description:\u003c\/strong\u003e Limited, see demandaam.com\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"American Axle \u0026 Manufacturing","offers":[{"title":"Default Title","offer_id":47835684765845,"sku":"120T1342GEARKIT","price":728.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0496\/4266\/8181\/files\/120T1342GEARKIT.png?v=1787718759","url":"https:\/\/mizumoauto.com\/products\/aam-120t1342gearkit-ring-pinion-kit-gm-12-0-3-42-ratio","provider":"Mizumo Auto","version":"1.0","type":"link"}