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</head><body><p style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Assuming the diff is out of the car.<br></p><p style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">1. Rotate 1 stub axle. If the other stub axle rotates the same direction it is either a posi track diff or the spider gears have been welded. If the other stub axle rotates in opposite direction it is an open diff.<br></p><p style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">2. Assuming both stub axles rotate same direction:<br></p><ol><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Match mark 1 stub axle and input pinion flange.<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Rotate stub axle 360 degrees while counting the number of revs the pinion flange turns and look at where match mark on pinion flange ends up.</li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">If pinion flange rotated:<br><ul><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">4 1/2 turns gear ratio is 4.5 : 1.0<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">A little more than 4 revs ratio is 4.11 : 1.0<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">A little less than 4 revs ratio is 3.89 :1.0<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">3 1/4 revs ratio is 3.26 :1.0<br></li></ul></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Assuming stub axles rotate in opposite directions<br><ul><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">block 1 stub axle from turning with a bolt inserted in a axle mounting hole. <br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">rotate the free stub axle clockwise until opposite stub axle does not turn.<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">match mark free stub axle and pinion flange<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Now rotate free stub axle 2 revolutions while counting pinion flange revs<br></li><li style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;">Go to step 3 above for ratios.<br></li></ul></li></ol><blockquote type="cite">On June 7, 2018 at 11:29 AM Bobby Whitehead via Fot <fot@autox.team.net> wrote:<br><br><div style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div id="ox-84c56048e5-yui_3_16_0_ym19_1_1528385256310_9506">Can some of you smart guys help me to figure out gear ratios on the differential?</div><div id="ox-84c56048e5-yui_3_16_0_ym19_1_1528385256310_9529"><br></div><div id="ox-84c56048e5-yui_3_16_0_ym19_1_1528385256310_9530">Bobby Whitehead<br></div></div></blockquote><p class="default-style" style="color: rgb(51, 51, 51); font-family: helvetica,arial,sans-serif; font-size: 12pt;"><br> </p><blockquote type="cite">_______________________________________________<br>fot@autox.team.net<br><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/pipermail/fot<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rkrantz77@comcast.net<br><br><br></blockquote></body></html>