Not sure. Have not had the drums off of either one. But here are the 2 backing plates. Only pics I have right now. The rusty one is the 3.42 ratio.

https://www.dropbox.com/sh/5ipq7vgrv6rueyj/AABIjf5fcaInmCMRtcEPsfa5a?dl=0


Larry W.


1953 3800 Dually Flatbed