The best info I could find was 60-61" in between backing plates. How accurate of a measurement do you need? Changing axles? Complete rear end swap? Posted using the Full Custom H.A.M.B. App!
mainly concerned about the front track width. I will probably do a narrowed 9" rearend in the back anyway so its not that important.
Nearly all cars before the fifties were standard 4'8" or 56" track width. There were a few cycle cars and mini cars with narrow track but they had a hard job driving on the rutted country roads of the day. Your DeSoto is probably 56" or close to it.
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