BEARING ROLLER EARLY PINION SMALL 3878/3820
Tapered Roller Bearing Early Type Small Pinion Shaft 3878/3820
For 8 3/4" differential
Tapered roller bearing for the small pinion shaft (pinion bearing) as fitted in the early 8 3/4" rear axle differential. This bearing consists of two separable parts: an inner race (cone) with roller cage and an outer race (cup). Suitable for early versions of military vehicles.
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Type Tapered roller bearing 3878/3820 |
Dimensions Ø bore 36.51 mm (1.4375") × Ø O.D. 73 mm (3.375") × width 30.16 mm (1.1875") |
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Application Small pinion shaft early 8 3/4" differential |
Construction Separable design with cone and cup |
Features
- Tapered roller bearing type 3878/3820 for small pinion shaft
- Suitable for early 8 3/4" differential
- Supports both radial and axial loads
- Separable construction with inner race (cone) and outer race (cup)
- Dimensions: 1.4375" × 3.375" × 1.1875" (36.51 × 85.73 × 30.16 mm)
★ Precision tapered roller bearing for repair and restoration of early rear axle differentials. Separable construction facilitates assembly and adjustment of pinion shaft preload.
Application
This bearing is specifically intended for the small pinion shaft (pinion bearing) in the early 8 3/4" rear axle differential, as fitted to early versions of military vehicles from the WWII period.
Installation notes
This tapered roller bearing must be fitted in mirror configuration with a second tapered bearing. The pinion shaft preload must be accurately adjusted according to factory specifications. During assembly, shims must be used to achieve the correct depth and preload. Professional installation with measuring equipment (torque wrench, dial gauge) is recommended.
Compatibility
Specific to the early 8 3/4" differential. Not compatible with the later 9 5/8" differential which uses different bearing sizes. Note: early and late versions of rear axle differentials are not interchangeable.
Historical context
Tapered roller bearings of this type were widely used in military vehicles during WWII due to their ability to support both radial and axial loads, essential for reliable performance under severe conditions.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
This part fits:
| Model | Years |
|---|---|
| Dodge | |
| Alle Dodge WC / M-serie | 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 9-808 — Technical Manual — only for Dodge ¾-ton 4×4 (WC series)
