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From: Hank Dozier
Remote Name: 220.127.116.11
Date: February 04, 2003
Sid...I believe the 57-up SureGrip rearends as far as axle splining to be the same (31 splines?). From that standpoint, it should fit. As to the case fitting the old housing, unless the bolt pattern changed, that would match as well. You can check with a comparison of a late 60s gasket to one off your '57. I have a Mopar Muscle? article on thew ew aluminum third member I can send you that may have more information on applications.