{"product_id":"performance-water-pump-kit-for-gmc-sierra-1500-1999-2006-4-8l-5-3l","title":"Performance Water Pump Kit for GMC Sierra 1500 (1999-2006) 4.8L 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Cooling Water Pump and Drive Belt Service Kit for 1999-2006 GMC Sierra 1500 (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit restores thermal regulation and accessory drive efficiency on 1999-2006 GMC Sierra 1500 trucks by overhauling the primary coolant circulation pump, drive belts, and tensioner assembly in a single service package.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Sierra 1500 Cooling \u0026amp; Belt Drive Fatigue\u003c\/h3\u003e\n\u003cp\u003eFactory \u003cstrong\u003eGMT800\u003c\/strong\u003e trucks running high-mileage Gen III Vortec V8s commonly suffer from mechanical seal dry-rot, weep-hole coolant leaks, and internal impeller cavitation. Repeated thermal cycling degrades the factory water pump bearings, generating runout that sideloads the accessory drive. Compounding this, the original spring-damped belt tensioners lose torsional resistance over time, inducing belt slippage, parasitic drag, and catastrophic throwing of the secondary A\/C compressor belt under sudden throttle load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service assembly utilizes a precision-cast aluminum water pump housing fitted with reinforced steel drive hubs and high-durability internal shaft bearings engineered to resist axial play. The included low-cavitation impeller maintains optimized volumetric coolant flow rates across peak operating temperatures without cavitation. Paired with heavy-duty EPDM multi-rib accessory belts and a high-rate torsional spring tensioner assembly, this kit eliminates belt chatter, corrects drive tracking, and matches strict OEM hydraulic loads.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1999-2006 GMC Sierra 1500\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003e4.8L LR4 \/ 5.3L LM7 Vortec V8\u003c\/strong\u003e \/ \u003cstrong\u003eGMT800\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e255-295 hp \/ 285-335 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003e12580162\u003c\/strong\u003e, \u003cstrong\u003e12609719\u003c\/strong\u003e, \u003cstrong\u003e12560380\u003c\/strong\u003e, \u003cstrong\u003e12562458\u003c\/strong\u003e, \u003cstrong\u003e12703898\u003c\/strong\u003e, \u003cstrong\u003e19195104\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1999-2006 GMC Sierra 1500 4.8L Vortec V8 (LR4)\u003c\/li\u003e\n  \u003cli\u003e1999-2006 GMC Sierra 1500 5.3L Vortec V8 (LM7, L59, LM4)\u003c\/li\u003e\n  \u003cli\u003eFits Standard Cab, Extended Cab, and Crew Cab configurations on the GMT800 platform\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT800 Sierra 1500?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1999-2006 GMC Sierra 1500 equipped with the \u003cstrong\u003e4.8L LR4\u003c\/strong\u003e or \u003cstrong\u003e5.3L LM7\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this water pump come with the thermostat housing installed?\u003c\/h4\u003e\n\u003cp\u003eYes, the assembly includes the pre-installed thermostat, integral housing, replacement gaskets, and sealing O-rings for complete installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Truck Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle heavy towing regimens, high thermal loads, and rigorous fleet duty cycles, this kit maintains essential block-to-radiator heat dissipation to ensure stable operating temperatures under maximum trailer payload.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67544643272952,"sku":"DS-EC0G4I1ZU","price":193.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-water-pump-kit-for-gmc-sierra-1500-1999-2006-4-8l-5-3l-1.jpg?v=1790708451","url":"https:\/\/performancechiptuning.com\/products\/performance-water-pump-kit-for-gmc-sierra-1500-1999-2006-4-8l-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}