What adjustment does Tech A recommend when installing linkage rods?

The recommendation to ensure the linkage rods install freely into the levers is crucial for proper functionality of the manual transmission system. Linkage rods are responsible for transmitting the driver's inputs to the transmission to engage the appropriate gears. If the rods are not installed freely, this can lead to binding or misalignment issues, making it difficult or impossible to shift gears smoothly.

Ensuring that the rods have a free movement allows for optimal performance, as it minimizes wear and potential damage to both the linkage components and transmission itself. This adjustment supports reliability and longevity in the system.

While installing them in the drive position may be relevant in certain contexts, it is not universally applicable to the linkage installation process. Therefore, the most crucial adjustment in this scenario focuses on the freedom of movement of the linkage rods when connecting to the levers.