Owned this truck since Nov. 2012. I have replaced cap, rotor, plugs, wires, both o2 sensors, exhaust from headers back, abs sensor on rear axle, and water pump. This weekend i did the shocks and oil pan gasket. My father owned the truck before me and did the plenum fix. I have a few questions and concerns. I noticed the passenger upper hub bolt was lose and when i pressed on the rotor the bottom was lose also. Maybe 2 treads on bottom and 5 or 6 on top, they didn't go in easy. The u joint and upper ball joint is shot and the seal leaks in the axle, on that side. Do i need to replace that hub ? Will there be damage in the front diff ? I know i have a 360 but i get horrible gas mileage. 8 in the city and 13 hwy. I have an air sucking noise thats coming from the pvc. There wasn't any metal shavings in my oil pan but the front was white and creamy. I want it to last a few years.