To what torque do i tighten my differencial cover bolts?
Assuming it is the original 8.8; Check this depction out to ensure a PO didn't swap it out for a 9" , Dana 60, etc.
Cover Depiction, 10 Bolt (click Rear Axle Identification, Ford)
Source: by Ventures Truck Parts & Equipment, L.C.
http://web.archive.org/web/20060318033805/...8%20Ring%20Gear
"....
Tighten bolts to 38-52 N-m (
28-38 lb-ft).
Tighten the cover bolts in a cross-wise pattern to maintain axle housing cover flatness.
Add lubricant through the filler hole until the lubricant level is 6.4-14.2mm (1/4 to 9/16 inch) below the bottom of the filler hole with the axle in the running position. (This means the Bronco is on a level surface; Not jacked up.
Add 5.5 pints of Premium Rear Axle Lubricant XY-80W90-QL or -KL or equivalent, plus (for Traction-Lok axles ONLY) 4 ounces of Ford Friction Modifier F3TZ-19B546-MA or equivalent.
Install the filler plug and tighten to 20-40 N-m (15-30 lb-ft). .."