The rear axle conversion to 4.10 in the Tech Tip sounds great but those axles are very scarce. My 1950 3600 with the 4 speed transmission (not sure how different your drive train would be) had a 4.56 rear axle and I gave up looking for an axle that could convert the original and instead installed a 1986 14 bolt rear axle with the 4.10 ratio. It was not a straight forward swap but there is a lot of information available here on what is required.
