A worn governor bore can lead to which issue?

A worn governor bore can lead to a failure to shift out of low gear due to insufficient feedback being provided to the transmission control system. The governor is responsible for monitoring the speed of the vehicle and relaying information to the transmission to facilitate proper shifting. When the bore is worn, it can result in excessive clearance, causing the governor to not function correctly. This often means the governor cannot effectively respond to changes in speed, which prevents the transmission from receiving the necessary signals to shift out of low gear.

In particular, the governor affects the hydraulic pressure and timing for gear shifts. With a worn governor bore, the hydraulic control cannot build the required pressure to transition gears smoothly, particularly when the vehicle needs to shift from low gear as speed increases. This results in the transmission being stuck in a lower gear longer than it should, leading to poor performance and potentially higher engine RPMs.

While other issues could arise in a transmission system, like increased line pressure or slipping when starting off, these are not directly caused by the governor bore wear in the same way that the lack of ability to shift out of low gear is. Thus, the focal point of this mechanical failure can be traced back to the relationship between the governor's condition and its control over gear shifting.