The SM318 was also used in earlier models as in my ‘52 3100. The Shop Manual calls for straight 90 weight mineral oil. Tractor Supply carries “ Traveller, Ford Tractor All Mineral 90 Transmission Fluid in 2 gal. containers, which meet all specs. Here is a [LINK].
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Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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