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I hope this comes out in a readable format. These are the RPM and MPH for my car at various RPM with the 3.78 ratio and the Mitchell OD 26%. I have 21 inch wheels. Hope this helps.

1000 3.78 22.79
1500 3.78 34.19
1750 3.78 39.89
2000 3.78 45.59

1000 2.8 30.77
1500 2.8 46.16
1750 2.8 53.85
2000 2.8 61.55