My dad's 03 4x4 5.4 150 super cab with a 6" lift it has rancho shocks with 24,000 miles has a bad rear suspension squeek when you put weight in the bed and also when you turn there is sometimes a squeel coming from the rear 8.8 diff. also if you have gotten stuck in mud and had to rock the truck out shoud you change the atf and diff. lube because of the clutches heating up