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Just picked up a 1979 F250 rear D60 for $100. Anways its got factory 4.10s and trac-lock. My question is, Are all 77-79 d60s 35 spline and full floaters? I know its a gem of an axle, but not sure just how good
I don't know which ones are and which ones arent. The quick way to tell if it is a full floater is to look at the hub. If it has 8 bolts all crammed together in a circle around the center then it is a full floater. Remove these bolts. What you are looking at then is the end of the axleshaft, it is the round thing you just took the bolts out of. Those bolts hold it in place to the hub. Now, pull it out and count the splines. You might have to tap on it with a hammer with a wood block to get it loose.
Have fun.
BTW - Seal it up with silicone when you put it back in. Otherwise the gear oil will seep out.
'79 F250 is going to be a full floater, which is 30 spline. The 35 spline semi-floaters are pretty rare (and are c-clip), and don't come in Ford trucks. Non-c-clip 35 spline semi-floaters are custom built.