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|If it is a five speed 80-90 gear oil is proper for both the rear end AND the tranny. If a four speed, 20W50 for the gear box and 80-90 for the rear diff. DO NOT put 80-90 in the four speed gear box...
As to filling ..the four speed gear box holds 3.1 pints and the five speed gear box holds 4.2 pints...the rear axle in both cases uses 3.1 pints...and the proper way to fill each is to the point where it flows out the fill opening..meaning it is full.