I am reading that my 85 300D has 2.88 gears. This still seems too high (ratio number) to me. Has anyone swapped in a diff out of another car with 2.47 gears. Is this worth the difference?

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Anything is possible if you don't know what you are talking about........

1985 Mercedes 300D
2007 Mercedes C-350
1980 Mazda Rx-7 (SA22C)
2005 Jaguar XJR
2007 Jeep Wrangler