[ElKotze]

I wrote down the number on the drum, went to NAPA and got the right one. My '72 C20 has a Dana 60. My '69 had a HO72, parts are impossible to find, so I put a 14 bolt SF in it. I had to move spring perches and shock mounts, not a big deal. Pushes the rear wheels out a little, too, which I like. If you get a 14 bolt, try getting a Full Floater. Best axle GM ever built, imho, and all the gears you'll ever need.