2018-2026 Expedition: Rear Differential Pinion Seal Replacement
Time: 1-2 hrs
Difficulty: moderate
Cost: $40-120 (depending on if you service the rear differential with the repair)
How to replace the rear differential drive pinion seal on a Ford Expedition. The process is the same for any 2018-2026 Ford Expedition. They all require 75W-85 full synthetic gear lube. The capacity will vary slightly, but in every case, the idea is to fill the rear differential to about 1/2 " to 3/4" below the fill hole. On vehicles with limited slip, you would add 4oz of XL-3 or equivalent friction modifier. Some fluids have friction modifier already added. These types of fluids are compatible with limited slip and non-limited slip differentials. Component torques as well as the pinion baearing preload bearing process, are the same across the model years. This video shows the process start to finish, including how to check and set pinion bearing preload.
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Assembly Gel
Lubegard 19260 Assemblee Goo, Blue, Light Tack Lubricant, 16 oz.
Motorcraft 75W-85 Gear Oil
Motorcraft 75W-85 Synthetic Gear Oil
Flange Nut
Ford Flange Nut HL3Z-4320-A
Socket Adapter
1/4" to 1/2" socket adapter
1/2" Breaker Bar
GEARWRENCH 1/2" x 24" flex head breaker bar
3-Jaw Puller
ARES 3-jaw puller set
75W-85 Gear Oil
RedLine 75W-85 Full Synthetic Gear Oil (compatible with limited slip & non-limited slip rear differentials, no additional friction modifier required)
Driveline Bolts
Ford driveline bolts
Pinion Seal
Ford BL3Z-4676-A Rear Differential Drive Pinion Seal
Inch-pound Beam Torque Wrench
1/4" drive beam torque wrench
32mm Socket
32mm deep impact socket
3/8 Brushless Ratchet
Milwaukee M12 Brushless 3/8 Ratchet. I like this one the most for it's compact size.