is it leaking from the rubber boot ?..this comes out of your output shaft assmebly..inside that rubber boot..is your drive shaft and a u-joint..around the drive shaft..is a oil seal..they tend to go bad..in order to replace the seal..you have to pull the motor out of the u-joint..more or less..pull the motor far enough forward to take the drive shaft out of the u-joint..where you can get to the drive shaft output shaft..then you will see the oil seal...and yes..3 oz is about right on the rear differental oil.
your wheel bearings are bad..you'll have to remove the brake drum..and knock out the bearings..before you do though..just try turning them by hand after you take the brake drum off..i bet it is froze...if it is..knock it out..do not hit the center of the bearing race !!..hit on the outside edge if you can..after you get it out..pull the seals out of the bearing..with some wd-40..spray it in the bearing..work it loose..after it's free..re-pack it with some wheel bearing grease.
