Allison Transmission Powermatic 6-Speed
Powermatic 6-Speed is a 6-speed automatic hydraulic transmission created by Allison Transmission and used in Chevrolet and GMC cars.
Chevrolet's Powermatic is a durable automatic transmission designed and built exclusively for medium- and heavy-duty trucks. Powermatic has construction features to meet trucker's demands for economy, performance, operating flexibility, minimum downtime and low maintenance cost.
Powermatic range control lever selects 5 operating positions: reverse (R), neutral (N), 3-Hi, 3-5, 3-4, and Lo-2.
Torque converter multiplies starting torque as much as 2.8 to 1. Effective ration of 14.8 to 1 available in Lo-2 range.
Converter lock-up clutch engages automatically when converter is not needed-gives direct engine coupling for high efficiency and fuel economy.
Planetary gears provide six closely spaces forward gear rations. Durable planetary gears are in constant mesh, engaged automatically by self-adjusting multiple-disc clutches.
Four-range control gives driver full control of forward driving ranges for best performance and flexibility.
Hydraulic retarder assists in braking. Pedal operated, retarder multiplies engine breaking up to six times.
Power take-off openings are provided on both sides of transmission case.
Usually it takes 19 qts. of lubricant for dry refill. This transmission can handle up to 333 ft.lb. of torque.
| Parameter | Value |
|---|---|
| Type | Automatic Hydraulic |
| Gears forward | 6 |
| Gears forward ratios | 5.29:1, 3.81:1, 2.69:1, 1.94:1, 1.39:1, 1:1 |
| Gears reverse | 1 |
| Gears reverse ratios | 6.04:1 |
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