OK, I'll add me few cents' worth... Probably the BEST way to tell is counting the teeth - a tedious and oily job at best. Most likely, the truck has a 9-inch rear (standard duty) or a Dana 60 if it is the heavy duty model. Most likely it is a Dana, because Ford didn't make a good heavy duty rear until the '80s when they came out with the 10.25 inch axle. Most of the axles have a tag that identifies the axle ratio and posi/non posi. The number would look like "4L11" for a 4.11 ratio with limited slip (posi). Unfortunately, given the age of the vehicle, it is unlikely that the tag is still in place. Most likely, the rear has at least had axle bearings replaced by this late date. Many of the "goober mechanics" simply discard tags as having little importance. The only SURE way to know is to actually count teeth. Sorry.
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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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