OIL SEAL PINION
WO639265
Pinion oil seal
For Dana 25, 27, 41, 44 axles
Oil seal for the drive pinion of front and rear axles. This closed-back seal ensures an oil-tight seal of the differential housing and keeps the pinion centred. Essential component when overhauling Dana axles.
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Type Closed-back pinion seal |
Dimensions 1 9/16" x 3.165" x 19/32" |
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Application Dana 25, 27, 41, 44 front and rear axle |
Quantity required 2 per vehicle (front + rear) |
Features
- Closed-back design with metal shell
- Oil-tight seal for drive pinion
- Centres the pinion in the housing
- Suitable for front and rear axles
- Original OEM specification
★ High-quality oil seal manufactured to original specifications. Made from oil-resistant NBR rubber with full metal jacket construction for long-lasting performance.
Application
This pinion seal fits Dana 25 front axles (MB, GPW, CJ-2A, CJ-3A, M38, M38A1, CJ-3B), Dana 27 front axles (late CJ-3B), Dana 41 rear axles (CJ-2A), and Dana 44 rear axles (CJ-3A, M38, M38A1, CJ-3B). Willys original part number: WO639265.
Installation notes
Remove the propeller shaft and loosen the pinion flange. Remove the old seal carefully to avoid damaging the housing. Lightly grease the new seal and drive it in straight and flat until fully seated. Check the condition of the pinion flange — grooves or wear will cause leakage. Set the pinion bearing preload correctly after installation.
Compatibility
Please note: this is a closed-back seal. For open-back version see part number 998092. Check which type was originally fitted. Not compatible with later Dana 30 axles used on CJ-5/CJ-6 from the early 1970s onwards.
Historical context
Dana supplied the robust axles for military Jeeps from 1941 onwards. The Dana 25/27 design with its characteristic fully floating construction proved its reliability in WWII and Korea, and remained in production well into the 1960s for civilian Jeep models.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
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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.
ALL_CATEGORIES : GROUP 11 - REAR AXLE, GROUP 11 REAR AXLE DANA 44, GROUP 10 - FRONT AXLE CJ2A, GROUP 11 - REAR AXLE CJ2A, GROUP 10 - FRONT AXLE CJ3A, GROUP 10 - FRONT AXLE - M38, GROUP 11 REAR AXLE DANA 44 3B, GROUP 10 - FRONT AXLE CJ3B, GROUP 11 REAR AXLE DANA 44 CJ3B
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 (early) | 1956, 1957, 1958, 1959 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
From the original Technical Manual TM 9-1803B — Ordnance Maintenance — Power Train, Body & Frame — only for Willys MB / Ford GPW (¼-ton 4×4)
