Cobalt,
I have seen Eatons HO 5,200's that were under leaf springs as well. This is definitly a first for me to hear of a HO 7,200 on a 3/4 ton 7500 GVW truck. What year is your truck? Does it have front disc brakes or drum? Are the front tire wheel studs matching 9/16"? What size drums are they? Are you 100% sure it is 100% original? You got me curious now!!!
Let us know!
Thanks
Jim "69oldie"