WhiskeyDan,
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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1993 300TE
1984 300D
1984 300SD
1976 BMW R90S
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