Someone here sent me a link a couple weeks ago when I was putting the 3:91's in my Polara that showed the numbers and which size pinion you needed for which gear and tire size. The last 2 digits in the part number is the number of teeth on the gear. Try this: http://www.moparts.com/Tech/tech/pages/speedo.html Bill wrote: > > Here we go AGAIN w/ the email delays(I had to post this directly from > Topica) This is really getting frustrating! > > I'm trying to fins some speedo gears and came across some on ebay. My > book says I should either use an 18DP (dark purple) or a 17O (orange. > I found a purple gear but its' not 'dark' and it's 17 teeth. I also > found an orange 17. Are either or these correct? > > Purple: Item # 130068622847 > > Orange: Item # 4649281184 > > Thanks in advance > > Bill M > 65 Coronet 500 'vert Jeff Adams 64 Polara ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.