What may indicate that the transmission is slipping out of gear?

The indication that the transmission is slipping out of gear is reflected in the increased RPMs of the engine without a corresponding increase in vehicle speed. This condition often occurs when the gears are not fully engaging, causing the engine to rev higher while the vehicle does not accelerate as expected. Increased RPMs signify that the engine is working harder than it should for the speed of the car, which is a common symptom of a slipping transmission.

In contrast, delayed engagement may point to other issues such as low fluid levels or a malfunctioning clutch, but they do not specifically highlight the characteristics of slipping out of gear. Similarly, having no engine noise generally suggests normal operation rather than a fault in the transmission, and improved acceleration would indicate that the transmission is functioning correctly and efficiently, not that it is slipping.