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the sure grip is 1969 and up unit ,, case could be 741 or 489 ,,, as stated above look at the case near the yoke for the part number -- drive pattern on your gear is terrible and the coast doesn't look any better .i would adjust your shim selection to improve the drive pattern if you want that gear to live ,,, i prefer heavier gear oil 75w140 type and a bottle of friction modifier.
75w85 gear oil is typical but then you have other opinions.. 75w140 etc etc. I guess it depends on what you want. ANd you just add the additive to the gear oil when putting it in the rearend.