I’ve got a 49 3/4 ton. It had a 5.14 gear in it. There were three ratios sold for these rearends. I swapped the pumpkin for a 4.10 and gained 6-7 mph. But I don’t know what you have in a 58. If it’s an Eaton HO52. It’s an easy swap. That axle was used from 47 to 1972.

Don

Can’t begin to tell you how much I hate the name Stovebolt.