My operators manual states the following:
Tractors operating in temperatures below +40 degrees F., IH Hytran fluid or SAE-80 gear lubricant. Tractors operating consistently above +40 degrees F., IH Hytran fluid or SAE-90 gear lubricant.
Capacities: Transmission - 3-1/2 pt.
Rear Axle Housing - 1-3/4 pt.
Belt Pulley Housing - 1/3 pt.
Those are the descriptions in the manual.
The transmission filler plug is on top next to the battery box. The level plug is on the side opposite the seat, under the platform and forward of the rear axle.The drain plug is on the same side as the seat, on the front of the lowest part of the transmission.
The belt pulley plugs are fairly obvious, filler on top, level on the rear and drain on the bottom.
The rear axle filler and level plugs are the same, the pans must be removed to drain the old oil.
Hope this is helpful,
'48 Cub and 4 other tractors