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I am having the radiator, water pump etc replaced in my wife's 2003 Navigator with 128,000 mi. It is now only being driven less than 3000mi a year. So should I have the timing chains, oil pump etc replaced and if so, what is a trusted brand besides OEM? The kits can be pricey with sets costing between $150.00 to NAPA's $750. We plan on keeping this Navi that is in great condition for as long as we can.