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warinty number f25dr673209 w.b 129 color m model f250 body d81 trans n axle 24 maxg.v.w. lbs 7500 cert.net hp 172 r.p.m 4000 and then 72 but cant read last numbers ples inform of what it all means
In our trucks with the Dana 60 rear axle, the most common limited slip is a Spcer Power-Lok. Today there are other units for the 60, but from the time the trucks were new up into the late '70s and early '80s the Power-Lok was king. The Power-Lok is the unit your truck would have come with, if it had been a factory install, or if a dealer had converted it "back in the day".
A quick way to see if your rear axle might be a Power-Lok is to pull the rear avle fill plug and take a peek inside. A factory non limited slip (open) carrier is cast steel and you will see the natural cast surface of the carrier. A Power-Lok, and possibly other types of limited slips, has a machined carrier. When looking through the fill plug opening you will see a smooth, bright, machined surface.
You may need to lift both rear tires and have someone turn one of them to posistion the carrier so it can be seen through the fill opening.
As long as you have the truck in the air and are spinning a tire (by hand), check the other tire. If it is spinning the same direction as the one you are spinning, grab it. If you can't stop it you have a limited slip. If it stops either your limited slip isn't working or you have an open differential. If the second tire spins the opposite direction as the one you are turning you have an open differential.
number the pick with the dif with 2 tags is what mine looks like and it in about as bad a shap as the cast tag so that y i belev it is a origanal thing so is it likly that the dealer had it canged befor the origanal sale