70 3/4 ton axel ratio

[C. Sprague]

Hey, new here to the forum and hoping someone can point me in the right direction or provide me with the info. I found in an old vehicle scrap yard here in Michigan three 67-72 c-20 trucks with 350's and auto trans, two standard and one camper special. I'm trying to locate specs that might give me some insight to the possible gear ratios these axles may have had. I'm told that the camper special is probably a Dana axle and if so will not work for me anyway as I'm looking for an Eaton to replace the carrier and gears in my 49 3/4 ton. Have 4.56 gears now and would like at least 4.10 or 3.90.

Thanks in advance.

Chris