Alfredo popped off the diff covers and swapped the factory gear setup for a 4.10 ratio, thanks to the necessary parts from Randy's Ring & Pinion, and bolted on a Mag-Hytec Ford 12-9.75 differential cover. This cover holds more fluid and offers interesting features such as a magnet-filled dipstick tube and a drain plug that keep metal shavings away from your gears.
2006 Ford F150High And Mighty: Fabtech F-150 6 Inch Lift