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 - Tuning-Up Your Tractor: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
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