Vin trouble

Not that big a deal to move the spring perches from the top of the axle tube to the bottom. As long as the width is within reason, no reason it wouldn't work. Check that the u-joint size is the same, or, at least can be adapted. Most trucks don't have a provision for a pinion snubber if that is a concern for you. Look at the housing to see if it has drilled bosses to install one, or, you will need to make some brackets if it's something you want/need.