The Stovebolt Site Forums The Shop Area Driveline more MPH, less RPMS

Changing to a 3.55 is a great option, the only problem is there are none that fit a 37 rear end.
You would need to use a Power Glide car rear end or a 1940-54 truck rear end with Patrick's 3.5 gear set.
Both options would require some adapting.
I could talk you through it if you go one of these ways.