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help -need info for tansmission driven gears
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<table border="0" cellpadding="1" cellspacing="1" width="99%" align="center"> <tr bgcolor="#000000"><td> <table border="0" width="100%" cellpadding="3" cellspacing="0"> <tr bgcolor="#000099"> <td colspan="2" align="left"> <font size="2" color="#ffffff" face="Verdana, Arial"> <b>T O P I C R E V I E W</b> </font></td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>tangerine67</b> <br /><small>Member # 8071</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2010,8,22,17,27,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> fellas<br />what have u used to get your speedometer correct when changing gears in the rear end. i have a c-4, and just got 3.73 gears. what driven gear do i need im my tranny ? 21 tooth ? and im reading that..... The drive gear on Ford<br />rear wheel automatic transmissions is<br />machined into the output shaft. Changing<br />the drive gear is impractical since it<br />requires a new output shaft and transmission<br />teardown. Most have 7 or 8 teeth.<br /><br />help<br /> <br /> <small>[ September 22, 2010, 06:14 PM: Message edited by: tangerine67 ]</small> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>68stanger</b> <br /><small>Member # 7842</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2010,8,22,18,48,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> tooth count X gear ratio X tire rev per mile / 1000 (google a calculator to get your tire rev per mile)<br /><br />example - my transmission has a 7 tooth gear I went with 3.55 and I have 815 tire rev per mile, divide all that by 1000<br /><br />7 x 3.55 x 815 / 1000 = 20.25 the closest i will get my speedo is with a 20 tooth driven gear <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>tangerine67</b> <br /><small>Member # 8071</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2010,8,22,19,13,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 68stanger:<br /><strong> tooth count X gear ratio X tire rev per mile / 1000 (google a calculator to get your tire rev per mile)<br /><br />example - my transmission has a 7 tooth gear I went with 3.55 and I have 815 tire rev per mile, divide all that by 1000<br /><br />7 x 3.55 x 815 / 1000 = 20.25 the closest i will get my speedo is with a 20 tooth driven gear </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">thats where i need some help- i dont know if my trans has a 7 tooth gear , and i dont know how i get my tire rev per mile ??? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>68stanger</b> <br /><small>Member # 7842</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2010,8,23,21,20,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by tangerine67:<br /><strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 68stanger:<br /><strong> tooth count X gear ratio X tire rev per mile / 1000 (google a calculator to get your tire rev per mile)<br /><br />example - my transmission has a 7 tooth gear I went with 3.55 and I have 815 tire rev per mile, divide all that by 1000<br /><br />7 x 3.55 x 815 / 1000 = 20.25 the closest i will get my speedo is with a 20 tooth driven gear </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">thats where i need some help- i dont know if my trans has a 7 tooth gear , and i dont know how i get my tire rev per mile ??? </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">to figuring out which drive gear you have with out actually looking inside. first find out how fast your car is <b>actually</b> traveling (GPS helps) and whats the difference on your speedo (5-10mph off?) then count the teeth on the driven gear that your currantly using (not the one on the tailshaft) . from there use that formula I posted using either the 8 tooth then the 7 tooth. that should help determine which drive gear your using.<br /><br />example - im going an actual 50mph but my speedo says 53mph<br /><br /> <b>7t</b> x 3.73 x 815/1000 = 21.28 <br />the mph will be a little off but real close to my actual mph with that 21t gear<br /><br /> <b>8t</b> x 3.73 x 815/1000 = 24.32 (23tooth drive gear is the closest they have for my T5) with that 8 tooth gear my speedometer should be way more off then 53mph (actual 50mph).<br /><br />its not the most precise way but thats the best you can do without actually checking in there, hope that helps<br /> <br /> <small>[ September 24, 2010, 05:19 PM: Message edited by: 68stanger ]</small> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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