Spicer Differential Inner Pinion Head Bearing & Race Kit for Dana 44 Axles

Eliminate catastrophic differential gear howling, correct erratic pinion depth, and restore precision rotational geometry to your gear set with this genuine Spicer Differential Inner Pinion Head Bearing Kit. Specifically engineered to replace the high-load inner pinion bearing assembly sitting directly behind the pinion gear head, this factory-matched cup and cone kit provides a premium repair solution for standard Dana 44 axle housings.

The inner pinion head bearing handles the absolute brunt of the radial force and intense structural thrust generated by the ring and pinion mesh. Over high mileage, severe off-road trail abuse, or gear oil breakdown, the tapered rollers can pit, score, or overheat. This wear results in a characteristic deep, cyclical whining or rumbling sound that changes pitch directly with vehicle acceleration and deceleration, leading to loose pinion depth tolerances that can rapidly destroy the contact pattern of your ring and pinion set.

This original equipment manufacturer (OEM) kit includes a matching inner bearing cone and outer race (utilizing the industry-standard high-capacity 31594/31520 footprint). Precision-ground from case-hardened bearing steel, choosing a genuine Spicer replacement ensures strict original equipment tolerances are met—giving your differential the exact structural stiffness and heat dissipation required for smooth, whisper-quiet operation.

Kit Contents:

• (1) Premium Tapered Pinion Head Bearing Cone (Inner Section — 31594)

• (1) Precision-Ground Pinion Bearing Cup / Race (Outer Section — 31520)

Kit Highlights:

• Matched Component Pairing: Pre-bundled cup and cone assembly ensures flawless contact patterns across the tapered rollers, eliminating the micro-vibrations caused by mixing unmatched brands.

• Genuine Spicer OEM Quality: Manufactured by Dana to original equipment engineering specifications, providing vastly superior structural fatigue life compared to budget aftermarket alternatives.

• Case-Hardened Construction: Forged from high-cleanliness steel to withstand intense rotational friction and sudden torque loads on heavily loaded 4x4 trucks, Jeeps, and SUVs.

• Restores Critical Pinion Depth: Provides a perfectly concentric foundation to correctly set your pinion depth and bearing preload during a differential overhaul or ring and pinion gear swap.

Vehicle & Axle Fitment:

• Axle Profiles: Fits Dana 44 (Front or Rear) Axle Housings (Commonly fits 2006 and older traditional design axle assemblies).

• Jeep Models: 1997–2006 Wrangler TJ / LJ (Rear Dana 44 & Rubicon Front/Rear Dana 44), 1987–1995 Wrangler YJ (Rear Dana 44), 1984–2001 Cherokee XJ (Rear Dana 44), and classic CJ platforms.

• Dodge / Ram Models: 1994–2001 Ram 1500, 2500, and 3500 heavy-duty models equipped with a front Dana 44 axle.

• Chevy / GMC Models: 1960–1980 K10, K20, K10 Suburban, and K5 Blazer models equipped with a front Dana 44.