Spicer 3153 (Overdrive)
3153 (Overdrive) is a 5-speed manual transmission created by Spicer and used in Chevrolet and GMC cars.
Synchromesh engagement of second, third, fourth and fifth speeds eases shifting, eliminates the need for double-clutching, and protects gears from the damage of clashing. Mainshaft, countershaft, reverse idler shaft and all gears are machined from alloy steel, carburized and hardened for durability. Mainshaft and countershaft are mounted on high-capacity ball and roller bearings for efficiency and long service life.
Power take-off openings are provided on both the right and left sides of the transmission case. Drive gear on the left side is reverse idle gear, it has 25 teeth and provides 509 RPM at 1000 engine RPM. Drive gear on the right side is 2-speed counter gear, it has 22 teeth and provides 578 RPM at 1000 engine RPM.
Drum and band type parking brake is mounted at the rear of the transmission case.
This transmission usually requires 10 pints of lubricant and can handle up to 333 ft.lb. of torque.
| Parameter | Value |
|---|---|
| Type | Manual |
| Gears forward | 5 |
| Gears forward ratios | 6:1, 3.31:1, 1.94:1, 1:1, 0.79:1 |
| Gears reverse | 1 |
| Gears reverse ratios | 5.9:1 |
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