| TYPE | RATING | COMMENTS |
| Spur | Excellent | Parallel shaft. Highspeed,load,and efficiency. Recommended for all gearmeshes except where right-angle drive cannot be avoided. |
| Bevel | Fair to Good | Intersecting shaft. High speed and load. Recommended for right-angle drive, particularly low ratios. Should be located at one of the less critical meshes of DriveTrain. |
| Helical | Good | Parallel shaft. High speed and load. Efficiency slightly less than spur. Equivalent quality to spurs except for complication of thir angle. Recommended for all high-speed and high-load meshes. Axial thrust component must be accommodated. |
| Worm | Fair to good | Right-Angle shaft. High speed and load. Low efficiency. Recommendedfor combination high speed and right-angle drive. High sliding requires lubrication. |
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