I have a 83 CD that is primarily a interstate car and would love to lower rpm at 75mph. Its got to be healthier for the engine and better mpg because your engine is not working as hard. Lower diff with taller tires will lower rpm. Do those diffs mount right up or is an adapter to be made?

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I LOVE CATS....AND FRIES

1981 300sd
1983 300sd
1985 300d
1983 300cd
1991 350sdl