Gear Oil in a 1959 Edsel Rear End

['59Edsel]

I'm going to be changing the gear oil in my rear diff and am wondering what the equivalent to SAE 90 is. I've tried searching through the net but it's a somewhat confusing subject, with GL1 AND GL5 as well as 75/90 80/90 and so-fourth. Cany anyone shed some light on the subject?

[ford1]

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use gl3 or gl4, 85-90 weight, its a multi weight oil and it will work fine