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Diff. Fluid both front and rear. Not so much on the front unless your in 4wd alot. Store some money aside for repair, transmission might last you another 3 years or 3 days. You did ball joints but what about tie rods, pitman, and idler arm. Thermostat might be a near future issue along with a water pump. Don't really know what to tell you without actually seeing the truck or driving it. I would talk with a trusted mechanic if your really worried about it.
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