Spicer Rear Differential Pinion Seal & Self-Locking Nut Kit for Ford, Dodge & GM (Dana 80)

Eliminate messy rear differential fluid leaks, prevent premature gear fatigue, and maintain critical bearing preload on your heavy-duty tow rig or commercial vehicle with this genuine Spicer Pinion Seal and Self-Locking Nut Kit. Specifically compiled for heavy-duty Ford, Dodge/Ram, and Chevrolet/GMC trucks utilizing a Dana 80 rear axle, this essential service kit provides the exact OEM components needed to execute a successful pinion yoke refresh or leak repair.

The Dana 80 is a massive, high-torque rear differential found in duallys and chassis cabs that endure extreme towing conditions, high payload demands, and rigorous commercial use. Over time, high thermal cycles and continuous yoke rotation break down the outer rubber sealing lip, resulting in gear oil leaking onto your undercarriage. When servicing this seal, reusing a stretched or deformed pinion nut is a major liability that can cause the pinion to back off—altering gear mesh and inviting catastrophic differential failure. This premium service bundle removes the risk by replacing worn hardware with trusted Spicer OEM parts, ensuring precise thread engagement, exact torque retention, and factory-fresh fluid sealing.

Kit Highlights:

• Premium Dual-Component Bundle: Includes one genuine rubber-lipped pinion oil seal and one heavy-duty self-locking pinion yoke nut.

• Genuine Spicer OEM Quality: Precision-machined to rigid original equipment specifications, using high-performance, oil-resistant elastomers to withstand aggressive gear oil additives and friction.

• Maintains Preload Integrity: The included heavy-duty self-locking nut ensures that your internal pinion bearing preload remains securely clamped under severe structural loading.

• Direct Multi-Platform Fit: Mapped as a direct factory replacement for heavy-duty Dana 80 rear axle configurations across major truck manufacturers.

Vehicle & Axle Fitment:

• Makes: Ford / Dodge Ram / Chevrolet / GMC

• Common Applications: F-350 Dually, F-450, Ram 2500/3500 (with Cummins/V10 & Manual Trans), Silverado/Sierra 3500 HD

• Axle Profile: Dana 80 Rear Axle Assemblies Only

• Position: Rear Differential Input / Pinion Yoke Center Axis