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'57 Frame width according to my Shop Manual is 34" If your truck is a short bed it should have a wheelbase of 110" and a long bed would have a 118" wheelbase. I searched the forum for "4x4 frame" and here are a few of the links that seem to pertain to your question. Good luck and I hope this helps. https://www.ford-trucks.com/forums/938871-1954-f100-4x4-conversion-help.html https://www.ford-trucks.com/forums/1005434-anyone-ever-use-an-explorer-front-suspension-on-57-60-a.html https://www.ford-trucks.com/forums/905814-new-to-form-59-f100-4x4.html The end of page 1 on this thread talks about a '57 to a 78-79 Bronco. https://www.ford-trucks.com/forums/7...ontribute.html
Keli