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Originally Posted by ytr1903
If the donor rearend is a 2.47, stop doing whatever you are doing and install it into your 300SD. The change is phenomenal. I did mine about 2 months or so ago and would never think of going back to a 3.07. (I am guessing that you have a 1981-1984 300SD). MUCH quieter at highway speeds with no apparent loss in acceleration. It is not a difficult swap and the benefits are outstanding. I have not gone on a long trip yet, but commuting MPG is right at 30.
Tom
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Could you post your 0-62 mph acceleration time? I see BIG differences in my 190Ds using 3.23 and 3.42 rears and would expect the change from 3.07 to 2.47 to be MUCH worse, but I'm willing to be convinced if you could provide some data.
Marshall
Marshall