For a direct swap of a 14ff into a 73-91 blazer it must be a 3/4 ton axle, for a direct swap of a 14ff into a 69-72 blazer (with exception of shock mounts) it must be a 1 ton axle.
Basically a 69-72 blazer has a 40.5" center to center on spring pads and 73-91 has a 42.5" center to center on spring pads. A 1/2 and 3/4 ton has 42.5" spacing and a 1 ton has 40.5" spacing.
The axle I am asking about if it will bolt in is a 3/4 axle. However it's from a 2wd truck. Based on the replies I gather it will bolt in , but I have to change shock mounts. Correct?
As was already mentioned the shock mounts on a 2wd axle hang lower than a 4wd axle. Depending on your pinion angle will determine if you can use the stock mounts as is. I installed a 2wd axle in my blazer and because of the pinion angle the driver side shock body would hit the mount not allowing the shock to bolt in. The passenger side was good. What i did for the mean time was to cut a "V" out of the shock bracket and then bend the mount together and weld it together. This moved the shock body to a position that would now clear the bracket. Eventually i cut the shock mounts off and when i welded new spring pads on to eliminate spring shims i also welded on a set of 4wd shock brackets.
The axle I am asking about if it will bolt in is a 3/4 axle. However it's from a 2wd truck. Based on the replies I gather it will bolt in , but I have to change shock mounts. Correct?