'57 was the last year for coaxial power seering and '58 was the first year
for constant control. I'm not sure what all the technical differences are,
but they sure advertised a big change. The '57's use ATF and the '58's use
PS fluid.
--Roger van Hoy, '55 DeSoto, '58 DeSoto, '42 DeSoto, '66 Plymouth, '81
Imperial, Washougal, WA
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