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My '41 came with 3.78 gears and I was just not happy with the rpm and racket needed to keep up with Interstate traffic. Considered Columbia and Mitchell but ended up changing the rear end to 3.25 ratio. I am very pleased with performance cruising and in traffic. That is a little tall for a stock engine, but if you have a 4" or better stroke and a a stock or mild street cam, there is plenty of torque for low speed maneuvering and starting off on hills. With room, strength, patience, and reference materials, you can do it yourself. I was short on all of that, so I had Walker Smith hot rod shop do the gear change for me. It must be done precisely, and experience in this job is very beneficial to get it right the first time. The gears and gaskets are $400 from Van Pelt, and the shop should be under $1,000. Good luck with whatever route you take.