The Mack CRD93 rear-rear differential, part number RBT-CRD93-3.87 or CRD93R387, carries a 3.87 axle ratio and is sold on a core exchange basis. Before ordering, have your axle configuration details ready: pinion spline type (fine or coarse), upper torque rod mounting style (one tapered hole or two bolt holes), transverse rod mount configuration (four 3/4-bolt pattern at the rear of the differential housing), and your axle shaft spline count. These details ensure the correct unit ships for your specific axle build. Call Pro Gear and Transmission to confirm proper fit for your application.

• Ratio: 3.87

This differential is sold on a core exchange basis. Core charges will apply and may be refunded in whole or in part upon return, delivery, and inspection of your core unit. The returned core is subject to the manufacturer core acceptance policy. Contact Pro Gear and Transmission for details on the core return process prior to placing your order.