44-9 = 44-ring gear teeth, 9 pinion gear teeth for a 4.89 ratio. That is a Dana 44, 30 axle splines. The other tag, if legible is probably the BOM #, or build of materials numbers and can decipher the diff specs. D44 was and still is a popular diff/axle for light trucks, Jeeps, some cars and construction equipment. You can find parts at any auto parts store, offroad shop or many online stores.
If you need a vehicle application, pick a 60's to mid 90's dodge or ford half ton front diff. There are many others but these were probably the most popular with longest span of use. D44 spider gear kit can be had for around $125 or less, kit would include 2-axle/side gears & washers, 2-spider gears & washers, cross shaft pin and pin retainer bolt.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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