The Mack CRD92 front drive differential with a 5.55 gear ratio is sold here as part number RBT-CRD92-5.55, also referenced as CRD92R555. Before ordering, have the following on hand: whether your input and output shafts are fine or coarse spline, whether your upper torque rod mount is a single tapered ball stud hole or two-bolt dog bone style, whether your differential housing has four 3/4" bolt holes in the rear face for a transverse rod mounting plate around the rear through-shaft, and your axle spline count. These details vary across CRD92 applications, and confirming them upfront prevents a wrong-part return. Call Pro Gear and Transmission to confirm proper fit for your truck before placing your order.

• Gear Ratio: 5.55

This unit is sold on an exchange basis. A core charge will apply at time of purchase and may be refunded in whole or in part following delivery and inspection of your returned core. Core eligibility is subject to the manufacturer's core acceptance policy unless otherwise agreed in writing. Contact Pro Gear and Transmission prior to ordering to discuss core return logistics and to confirm the correct configuration for your application.