Specs for Ford 8.8"
Axle shaft end play is allowable up to 0.762mm (0.030 inch), but can be as low as 0.127mm (0.005 inch). It is controlled by the u-washer (4N237) that holds the axle shaft (4234) in the pocket of the differential side gear (4236). To reduce clearance, replace differential side gears, Traction-Lok® clutch plates if equipped, differential side gear thrust washers (4228 ) or axle shafts as required.
Ford PDF for diff setupApproximate Lubricant Capacity for F-150 and Bronco with 8.8-Inch Ring Gear: 5.50 U.S. Pints
All conventional and Traction-Lok® axles use Premium Rear Axle Lubricant, XY-80W90-QL or -KL or equivalent meeting Ford specification WSP-M2C197-A; Traction-Lok® rear axles require an additional 4 ounces of Ford Friction Modifier (F3TZ-19B546-MA or equivalent meeting Ford specification WSP-M2C196-A) for complete refill.
Lubricant levels are determined by filling the axle 6.4-14.2mm (1/4 to 9/16 inch) below the bottom of the filler hole with vehicle in a level position.
NOTE: Rear axle lube quantities must be replaced every 160,000 km (100,000 miles) or if the axle has been submerged in water. Otherwise, the lube should not be checked or changed unless a leak is suspected or repair required.
Torque Specifications:
Stabilizer Bar Brackets 40-57Nm (30-40Lb-Ft)
Differential Bearing Cap Bolt 95-115Nm (70-85Lb-Ft)
Differential Pinion Shaft Lock Bolt, Using Threadlock® and Sealer EOAZ-19554-AA or equivalent meeting Ford Specification WSK-M2G315-A5 20-40Nm (15-30Lb-Ft)
Ring Gear Attaching Bolts, Using Threadlock® and Sealer EOAZ-19554-AA or equivalent meeting Ford Specification WSK-M2G315-A5 95-115Nm (70-85Lb-Ft)
Rear Cover Bolt 38-52Nm (28-38Lb-Ft)
Oil Filler Plug 20-40Nm (15-30Lb-Ft)
Rear Axle Housing Vent 11-25Nm (8-18Lb-Ft)
Brake Backing Plate Nuts 28-54Nm (20-40Lb-Ft)
Driveshaft to Rear Axle Universal Joint Flange Attaching Bolts %u2014 Circular Flange 83-118Nm (61-87Lb-Ft)
RABS Sensor Hold-Down Bolt 34-40Nm (25-30Lb-Ft)
Wheel Lug Nut %u2014 Five Lug 100-180Nm (74-133Lb-Ft)
Pinion Bearing Preload (Rotational Torque) with Collapsible Spacer with pinion seal installed.
Used Bearings 0.9-1.5 Nm (8-14 Lb-In)
New Bearings 1.8-3.3 Nm (16-29 Lb-In)
