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I'm using the 2.47 rear end in my 617 powered R107 and am quite happy with the setup. A W123 300D is a little less than#200 heavier so you'd be getting a little less performance and a little less mpg. I'd assume that the coefficient of drag would be a bit higher as well. I get 27-28 mpg all around and up to 34 on the open road, so you'd be able to expect a bit less, all things being equal.
If you're looking for quick off the line performance you'll be disappointed, but if you're looking for quiet cruising and better engine longevity you'll probably be happy.
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Current Stable
- 380SL (diesel)
- Corvette C5
- Manx
- Baja Bug
- F350 Powerstroke
- Auburn Boattail Speedster replica
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