* Transmission Mount: This is a crucial component often overlooked. A worn or damaged transmission mount allows excessive movement of the transmission, leading to rough shifts and vibrations. This is a likely culprit if the motor mounts were already addressed.
* Transmission Fluid: Old, low, or contaminated transmission fluid can cause harsh shifting. Check the fluid level and condition. If it's dark, smells burnt, or is low, a fluid change and filter replacement are necessary.
* Worn Clutch (if manual): If it's a manual transmission, a worn clutch can contribute to rough shifting. This might manifest as difficulty engaging gears or slipping.
* Internal Transmission Problems: This is a more serious issue. Worn synchronizers, damaged gears, low internal fluid pressure, or other internal transmission problems can cause harsh shifting. This would require a professional transmission inspection and likely a rebuild or replacement.
* Shift Linkage/Cables: Problems with the shift linkage or cables (if applicable) can lead to imprecise shifting and feel rough. Check for broken or worn components, and ensure proper adjustment.
* Solenoids (if automatic): Automatic transmissions use solenoids to control shifting. Faulty solenoids can cause rough or delayed shifting. Diagnosis requires a scan tool to check for transmission codes.
* Torque Converter (if automatic): A failing torque converter can cause harsh engagement and rough shifting in an automatic transmission.
In summary: While motor mounts are important for vibration reduction, they aren't the sole cause of rough shifting. The problem likely lies within the transmission itself, its related components, or the fluid. A thorough inspection by a mechanic specializing in transmissions is recommended to pinpoint the exact cause. They'll have the tools and expertise to diagnose the issue correctly.
