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By 1967, MoPar was recommending the MoPar fluid. Using Type F ATF is not going to hurt anything, but it would be a good idea to change it out...
ATF type F is specified and correct for early Chrysler and Imperial power steering systems. What year is your Imperial?
Worn out PS pumps show the symptoms you describe: poor performance at idle, belt chirping. You should not convert one pump type to another. Stick...
