GEAR MAIN DRIVE 18 TEETH TRANS T90
WO640428
Main Drive Gear T84 gearbox
Input shaft gear for Willys MB, Ford GPW and M201 with T84 transmission
Replacement gear for the main drive shaft (input shaft) of the T84 gearbox. This gear forms the connection between the clutch and the main shaft of the transmission, and is subject to wear from the constant load during gear changes. Suitable for Willys MB, Ford GPW (1941-1945) and French M201.
Vehicle Willys MB / Ford GPW / M201 | Transmission T84 (3-speed) |
Type Input shaft gear with integrated gears | Number of teeth 24 teeth (small) / 17 teeth (large) / 10 splines |
Features
- Replaces original WO-A-* or GPW-* number Compatible with original Federal 1207 or equivalent bearings Contains recess for 13 roller bearings in the shaft Synchronised second and third gear
★ The main drive gear is a critical component of the T84 transmission and must be correctly adjusted using spacers and shims. During overhaul, the end play must always be checked according to TM 9-1803B specifications.
📖 From the Technical Manual
Mounting
- 1. Place 13 roller bearings in the bore of the gear, retain with light grease 2. Fit front bearing with snap ring (thickness 0.077" for correct retaining ring) 3. Install gear in transmission housing with clutch shaft through bore 4. Adjust end play with spacers to 0.006-0.008" (measured with dial indicator) 5. Check end play again after coupling with transfer case, before fitting mainshaft gear
Specifications
- Main shaft end play: 0.006-0.008" (nominal) / 0.016" max. service limit Countershaft end play: 0.004" minimum / 0.016" service limit Front bearing type: ball bearing with single shield Pilot bearing roller bearings: 13 pieces, no grease required (oil lubrication)
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 07 - TRANSMISSION CJ3A, GROUP 07 - TRANSMISSION - M38, GROUP 07 - TRANSMISSION CJ3B
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys M38 | 1950, 1951, 1952 |
| Willys M38A1 | 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
| Jeep CJ-3B | 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
