A transaxle "walks" out of gear. What could potentially cause this issue?

When a transaxle "walks" out of gear, it indicates that there is a failure in maintaining proper engagement between the gears. This can occur due to several mechanical issues, notably broken engine mounts or installation issues related to the shift lever boot.

Broken engine mounts can allow excessive movement of the engine and transaxle during operation. If the engine shifts position due to worn or broken mounts, it can alter the alignment of the transmission with the shift linkage, leading to an improper engagement or the shifter unintentionally moving out of gear.

Similarly, an improperly installed shift lever boot can contribute to this issue as it may not provide the necessary guidance and protection for the shift linkage. If the linkage is misaligned or if the boot is causing obstructions or hindrances, it can prevent the shifter from securely engaging the transaxle into the correct gear.

Given that both broken engine mounts and shift lever boot installation problems can be contributing factors to a transaxle walking out of gear, the choice that includes both potential causes is indeed the most comprehensive and accurate. This reflects a thorough understanding of how each mechanical aspect can impact transmission performance.