Description Product DescriptionHarvest King Ford Tractor Transmission Fluid SAE 90 is designed specifically for use in vintage Ford tractors manufactured between 1939 and 1952. This non-detergent 40W GL-1 mineral oil provides dependable lubrication for transmissions, final drives, and hydraulic systems in classic tractor models.Product OverviewFor use in Ford tractors from 1939â1952Non-detergent 40W formulationGL-1 mineral oil baseLubricates transmissions, final drives, and hydraulic systems