Yo 4by4,
We bought our 96 new and have used just what Ford recommends.
See info in 96 Bronco Workshop Manual, partial at
http://www.diesel-dave.com/vehic/manual/stj/stjleft.htm
Section 05-03A: Axle, Front Drive, Dana Models 44 and 50; Use 4x4 Gear Oil F1TZ-19580-A or equivalent meeting Ford specification WSL-M2C191-A. Add 0.089L (3 ounces) of Ford Friction Modifier F3TZ-19B546-MA or equivalent meeting Ford specification WSP-M2C196-A, if equipped with Limited Slip (Dana 44 IFS Only).
Section 05-03D: Differential, Front Drive, Dana Model 44
Limited Slip
1996 F-150 4x4 Front Axle Vehicles Workshop Manual
Lubricant Specifications
Description
Part Number
Specification (Ford)
4x4 Gear Oil
F1TZ-19580-A
WSL-M2C191-A
1.7l (3.6 Pints)
Ford Friction Modifier
F3TZ-19B546-MA
WSP-M2C196-A
0.089l (3 Ounces
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Section 05-02G: Axle, Integral Carrier,
8.8-Inch Ring Gear
1996 F-150 and Bronco Workshop Manual
SPECIFICATIONS
All conventional and Traction-Lok® axles use Premium Rear Axle Lubricant, XY-80W90-QL or -KL or equivalent meeting Ford specification WSP-M2C197-A plus 4 ounces of Ford Friction Modifier F3TZ-19B546-MA or equivalent meeting Ford specification WSP-M2C196-A for complete refill of Traction-Lok® rear axles.
b 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 **** quantities must be replaced every 160,000 km (100,000 miles) or if the axle has been submerged in water. Otherwise, the **** should not be checked or changed unless a leak is suspected or repair required.
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Al