The Timken Company Model T-221
Model T-221 is a gearbox created by The Timken Company and used in Chevrolet and GMC cars.
The four-wheel drive transfer case distributes power to rear axle only for two-wheel drive, or to both front and rear axles for four-wheel drive. In four-wheel drive position, driver has the choice of direct gear or 1.94 to 1 underdrive. Control is through a single lever having four positions. From the rear toward the front of the truck these positions are: four-wheel underdrive; neutral; four-wheel direct drive; and two-wheel direct drive.
All rears and shafts are accurately machined from alloy steel, carburized and hardened for durability. Shafts are mounted on antifriction ball or roller bearings for efficiency and long service life.
A power take-off opening is provided at the rear of the case.
| Parameter | Value |
|---|---|
| Type of Differential | (lockable) |
| Gears forward | 2 |
| Gears forward ratios | 1.94:1, 1:1 |
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