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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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