Chevrolet 4-Speed Synchomesh
4-Speed Synchomesh is a 3-speed manual transmission created by Chevrolet and used in Chevrolet and GMC cars.
The Chevrolet 4-speed transmission provides synchromesh gear engagement is second, third and fourth speeds for quick, clashless gearshifting. All components are built for dependability and durability. A magnetic chip collector removes metallic impurities from the lubricant, thus reducing wear of moving parts.
A drum and band type parking brake is attached to the transmission case with installations on Series 20 and 30. Parking brake for Series 50 and 60 is drum and dual-shoe type attached to the transmission case. Rear brakes comprise the parking brake for Series 10 with 4-speed transmission.
Transmission can handle up to 281 ft.lb. input torque. Usually this transmission requires 6.25 pints of lubricant.
Power take-off opening is provided on the left side of the transmission case, has 6 bolts, and complies with S.A.E. standard. Drive gear is 3rd speed counter gear with 33 teeth and 425 RPM at 1000 engine RPM.
| Parameter | Value |
|---|---|
| Type | Manual |
| Gears forward | 3 |
| Gears forward ratios | 7.06:1, 3.58:1, 1.71:1, 1:1 |
| Gears reverse | 1 |
| Gears reverse ratios | 6.78:1 |
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