Spicer 7216-3B
7216-3B is a 16-speed with 4 reverse speeds manual transmission created by Spicer and used in Chevrolet and GMC cars.
The Spicer 7216-3B sixteen-speed compound transmission is composed of a four-speed main unit and an attached four-speed auxiliary rear section. Each is controlled by a separate shift lever. All forward speed gears are constant-mesh helical type and the reverse gears are spur type. All gears are made of carburized and hardened alloy steel. The cases are cast iron and feature several PTO openings. Main unit has two openings. On the left side is SAE 6-bolt, on the right side is SAE 8-bolt, both driven by P.T.O. gear which provides 724 RPM at 1000 engine RPM. Auxiliary unit also has two openings. On the left side is SAE 6-bolt, on the right side is SAE 8-bolt, both driven by countershaft drive helical gear which provides 198 RPM on 1st speed, 353 RPM on 2nd speed, 615 PRM on 3rd, 1064 RPM on 4th speed, and 352 RPM on reverse at 1000 engine RPM.
The basic advantage of a compound transmission is the compact, lightweight installation afforded by elimination of externally mounted auxiliaries. All gear reductions needed are available without the use of multiple-speed axles or complex drivelines.
Shifting through the 7216-3B is accomplished by placing the main unit in first gear and shifting the auxiliary through its four speeds. The same procedure is followed for the rest of the main speeds with the exception of not using the auxiliary's low-low gear with main speeds two through four.
Usually it requires 28 pints of lubricant.
| Parameter | Value |
|---|---|
| Type | Manual |
| Gears forward | 16 |
| Gears forward ratios | 8.59:1, 6.50:1, 5.37:1, 4.45:1, 4.83:1, 3.65:1, 3.02:1, 2.50:1, 2.27:1, 2.09:1, 1.73:1, 1.43:1, 1.60:1, 1.21:1, 1.00:1, 0.83:1 |
| Gears reverse | 4 |
| Gears reverse ratios | 8.60:1, 6.51:1, 5.38:1, 4.45:1 |
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