Chevrolet Turbo Hydra-Matic 3-Speed
Turbo Hydra-Matic 3-Speed is a 3-speed automatic hydraulic transmission created by Chevrolet and used in Chevrolet cars.
Turbo Hydra-Matic 3-speed automatic was available on Series CS/CE10-20; PS20 models only. It provided greater performance, smoothness and flexibility through a 3-element torque converter with a compound planetary gearset. The additional forward gear, as compared to 2-Speed Automatics, afforded improved fuel economy and better performance by more efficient use of engine torque thru all ranges.
A six-position selector provided the following ranges: Park, Reverse (R), Neutral (N), Driver (D), Low Tow (L2), and Low One (L1). Moving the selector to L2 locked out third gear entirely, with automatic shifting between first and second gears. The transmission was locked in low gear when L1 was selected.
Automatic shifting schedules are controlled by a vacuum modulator instead of the mechanical linkages used in other designs. This allowed smoother shifts by „sensing“ engine vacuum changes.
Downsifts for passing were controlled by a solenoid on the carburetor.
Usually it requires 19 pints of lubricant for dry fill and 9 pints for refill.
| Parameter | Value |
|---|---|
| Type | Automatic Hydraulic |
| Gears forward | 3 |
| Gears forward ratios | 2.48:1, 1.48:1, 1.00:1 |
| Gears reverse | 1 |
| Gears reverse ratios | 2.10:1 |
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