Hi all, Grant here from Wisconsin. Looking for experienced opinions for my 59 3100. I currently have a 330 hp small block with a Saginaw 4 gear from early 70's car. I am running 255-70x15 tires. I currently run 2500 rpm at 55 mph using factory rear end, gear ratio not sure of. It was a 6 cylinder 3 speed.(3:90/4:11?) I have a 12 bolt posi with 3:73 ratio that I intend to install in truck. I would like to get the rpm's down some more for highway travel, and still have good performance. (occasional burnouts). What do you think, leave the 3:73 or switch to 3:42? Thanks, Grant.
