Re: upgraded gears and a diff. whine
You can still get Ford Racing gears for the 8.8" rear end. They are still currently being made. But as said, it's getting harder and harder to find actual Ford Racing gears for the 7.5".
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.