{"product_id":"14-26-gm-1500-ppe-heavy-duty-cast-aluminum-rear-differential-cover-raw-finish-138051200","title":"PPE 138051200 AAM 9.5\"\/9.76\"-12-Bolt Heavy Duty Cast Aluminum Rear Differential Cover (Raw Finish) | 2014-2026 GM Silverado\/Sierra 1500 3.0L I6 Turbo Diesel","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA356.0-T6 heat-treated cast aluminum\u003c\/li\u003e\n\u003cli\u003eRaw cast aluminum finish\u003c\/li\u003e\n\u003cli\u003eAdds 0.6 quart of fluid capacity\u003c\/li\u003e\n\u003cli\u003eHalf-inch external cooling fins\u003c\/li\u003e\n\u003cli\u003eInternal windage scrapers reduce churning and heat\u003c\/li\u003e\n\u003cli\u003eCross-bracing structure improves rigidity\u003c\/li\u003e\n\u003cli\u003eCast-in gussets add flange support\u003c\/li\u003e\n\u003cli\u003e304 stainless plugs, neodymium magnets, Viton O-rings\u003c\/li\u003e\n\u003cli\u003eFill plug set at factory fluid level\u003c\/li\u003e\n\u003cli\u003eFits AAM 9.5\" and 9.76\" 12 bolt axles\u003c\/li\u003e\n\u003cli\u003eFor build code SU7 axles only\u003c\/li\u003e\n\u003cli\u003eMade for 3.0L Duramax Silverado and Sierra 1500\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eGive The Oil In Your Rear Axle More Room To Stay Cool And Clean\u003c\/h4\u003e\n\u003cp\u003eYour rear differential has one of the least glamorous jobs on the truck, but it is also one of the busiest. Every time you tow, haul, or climb a long grade, the gears churn through a limited supply of fluid. PPE says excessive heat breaks down the protective qualities of that fluid, which speeds up wear on the gears and bearings. In a limited slip differential, constant high temperatures can also wear down the clutch packs and friction modifiers, which costs you traction. This cover gives the oil more room to work with, adding 0.6 quart of capacity for what PPE calls higher thermal capacity. Half inch fins on the outside shed heat, and scrapers on the inside keep the fluid from churning more than it should. Magnets in the drain and fill plugs capture ferrous particles, so the metal wear that does happen stays away from the gears. For a 3.0L Duramax 1500 that carries a real workload, it is a durable upgrade to a part that rarely gets attention until something goes wrong.\u003c\/p\u003e\n\u003ch4\u003eBuilt For The SU7 Axle Code With A Larger Fluid Capacity And Cast In Reinforcement\u003c\/h4\u003e\n\u003cp\u003eThe PPE 138051200 is a raw finish, heavy duty cast aluminum rear differential cover for AAM 9.5 inch and 9.76 inch, 12 bolt rear axles on Silverado and Sierra 1500 trucks with the 3.0L turbo diesel Duramax. PPE casts it from A356.0-T6 heat treated aluminum in permanent steel molds, which it says gives a smooth, consistent finish and high dimensional accuracy. The cover adds 0.6 quart of fluid capacity, and half inch external fins improve heat dissipation, lower the differential fluid temperature, and add impact resistance. Precisely placed internal windage scrapers prevent excessive churning, which PPE says reduces heat generation, fluid aeration, and power loss. Those scrapers and the external fins work together as a cross bracing structure, and cast in gussets add support at the housing flange. Both service plugs are 304 stainless steel with high temperature neodymium magnets and Viton O rings, and the fill plug sits at the factory level. PPE lists the GM OE references as 22951487, 25824253, and 84446288. This cover is for build code SU7 only, and trucks with the SU8 axle need PPE's 9.5 inch, 12 bolt cover instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Silverado\/Sierra 1500 3.0L I6 Turbo Diesel Duramax, AAM 9.5\"\/9.76\"-12 bolt rear axle, build code SU7 only\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFor 3.0L Duramax Silverado and Sierra 1500 trucks with the AAM 9.5\"\/9.76\"-12 bolt rear axle and build code SU7 only, confirm your axle build code before ordering\u003c\/li\u003e\n\u003cli\u003eNot compatible with GM 9.5\" rear axles with build code SU8, PPE's 9.5\"-12 bolt covers for SU8 trucks are 138051400 (raw), 138051410 (brushed), and 138051420 (black)\u003c\/li\u003e\n\u003cli\u003eRaw finish\u003c\/li\u003e\n\u003cli\u003eAdds 0.6 quart of fluid capacity over the stock cover\u003c\/li\u003e\n\u003cli\u003eGM OE references 22951487, 25824253, and 84446288\u003c\/li\u003e\n\u003cli\u003eFill plug is positioned at the factory fluid level, both plugs are 304 stainless steel with neodymium magnets and Viton O-rings\u003c\/li\u003e\n\u003cli\u003eHeat, wear, and fluid temperature benefits are manufacturer statements, results will vary\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0611\/8539\/2883\/files\/2014-2025-GM-1500-AAM-12-Bolt-Heavy-Duty-Cast-Aluminum-Rear-Differential-Cover_1380512XX_Install-Guide_R1025.pdf?v=1761150726\" target=\"_blank\" rel=\"noopener\"\u003e\u003cstrong\u003eInstall Instructions\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"PPE","offers":[{"title":"Default Title","offer_id":49527210017052,"sku":"PPE138051200","price":233.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2279\/8108\/files\/138051200_-2_small_3000x_be497930-f35b-43c9-97df-4ce80fbd900c.jpg?v=1722345503","url":"https:\/\/www.alligatorperformance.com\/products\/14-26-gm-1500-ppe-heavy-duty-cast-aluminum-rear-differential-cover-raw-finish-138051200","provider":"Alligator Performance","version":"1.0","type":"link"}