The link I provided is for a ring and pinion to fit a 1955-1962 1/2 ton pumpkin.It will not interchange with your original 3rd member.If you have the 55-62 pumpkin you can do the conversion.
Patricks has a 3:55 ring and pinion that might work for you.You need to call them at 520-836-1117 .
Tim
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