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I have changed the gear in my 70 Dart from a 3:23 to a 3:55 and run 255-60/15 (27")tires on the back. I need a 35 tooth speedometer pinion gear; P/N 2538935 according to the Moparts tech section.

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The math for the combo in the OP comes out to 34.4, when the decimal is less than .5 it's best to go with the smaller gear, this will make the speedo read a little high which avoids speeding tickets.

The number for some gears has changed, the new one for the 34 is 52068156.

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I have same setup and got 34

http://cgi.ebay.com/ebaymotors/Mopar-Spe...p4506.m20.l1116

http://cgi.ebay.com/ebaymotors/Mopar-Spe...p4506.m20.l1116