Originally Posted by Jippah

im sure someone more knowledgable will chime in soon enough, but in the mean time...
according to my service manual, the bronco had a few different rear axle set ups dependant on the respective axle code found on the door tag;
<table width="297" style="width: 223pt; border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><colgroup><col width="85" style="width: 64pt; mso-width-source: userset; mso-width-alt: 3108;"><col width="64" style="width: 48pt;" span="2"><col width="84" style="width: 63pt; mso-width-source: userset; mso-width-alt: 3072;"><tbody><tr height="20" style="height: 15pt;"><td width="85" height="20" class="xl65" style="border: rgb(131, 153, 177); width: 64pt; height: 15pt; background-color: transparent;"></td><td width="128" class="xl66" style="border: rgb(131, 153, 177); width: 96pt; background-color: transparent;" colspan="2">Bronco</td><td width="84" class="xl65" style="border: rgb(131, 153, 177); width: 63pt; background-color: transparent;"></td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">Regular Axle</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Ratio</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Rating</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Locking Axle</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">03</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.11:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">2780 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">A3</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">04</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.57:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">2780 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">A4</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">05</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.11:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3300 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">A5</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">06</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.57:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3300 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">A6</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">18</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3.50:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">2780 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">B8</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">19</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3.50:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3300 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">B9</td></tr><tr height="20" style="height: 15pt;"><td height="20" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;"></td><td style="border: rgb(131, 153, 177); background-color: transparent;"></td><td style="border: rgb(131, 153, 177); background-color: transparent;"></td><td style="border: rgb(131, 153, 177); background-color: transparent;"></td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;"></td><td class="xl66" style="border: rgb(131, 153, 177); background-color: transparent;" colspan="2">Econoline</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;"></td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">Regular Axle</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Ratio</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Rating</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">Locking Axle</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">01</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3.50:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">2300 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">-</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">02</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.00:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">2300 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">-</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">07</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3.00:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3050 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">A7</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">11</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3.50:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3050 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">B1</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">12</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.11:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3050 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">B2</td></tr><tr height="20" style="height: 15pt;"><td height="20" class="xl65" style="border: rgb(131, 153, 177); height: 15pt; background-color: transparent;">13</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">4.57:1</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">3050 lbs</td><td class="xl65" style="border: rgb(131, 153, 177); background-color: transparent;">B3</td></tr></tbody></table>


so basically what i'm asking for clarifiaction is; which axle did you put in your pickup?
hope this helps you to learn a bit more about your swap