Part # Price Description 60-TLHI-A $329.95 4.10 Down Trac-Lock 30 spline 60-TLLO-A $329.95 4.56 Up Trac-Lock 30 spline 60-TLHI $329.95 4.10 Down Trac-Lock 35 spline 60-TLLO $329.95 4.56 Up Trac-Lock 35 spline 60-ARBH-A $749.95 4.10 Down ARB Air Locker 30 spline 60-ARBL-A $749.95 4.56 Up ARB Air Locker 30 spline 60-ARBH $749.95 4.10 Down ARB Air Locker 35 spline 60-ARBL $749.95 4.56 Up ARB Air Locker 35 spline 60-DLHI-A $599.95 4.10 Down Detroit Locker 30 spline 60-DLLO-A $599.95 4.56 Up Detroit Locker 30 spline 60-DLHI $599.95 4.10 Down Detroit Locker 35 spline 60-DLLO $599.95 4.56 Up Detroit Locker 35 spline 60-ODHI $169.95 4.10 Down Open Differential - 30 or 35 spline 60-ODLO $169.95 4.10 Up Open Differential - 30 or 35 spline 60-SPLO $299.95 4.56 Up 35 spline spool