In a situation where a transmission is low on lubricant, which component is LEAST LIKELY to fail?

When considering which component is least likely to fail in a scenario where a transmission is low on lubricant, the synchronizer assemblies are a crucial choice. Synchronizer assemblies are designed to facilitate smooth engagement of gears and are less directly exposed to the lubrication system compared to other components like bearings.

The mainshaft, countershaft bearings, and clutch shaft bearing rely heavily on proper lubrication for their operation. These parts are subjected to significant wear and friction, which can lead to failure when lubricant levels are inadequate. Insufficient lubrication can cause increased friction and heat, resulting in more severe wear on these components, leading to potential failures.

In contrast, synchronizer assemblies primarily assist with matching the rotational speeds of the gears before they engage, and while they do benefit from lubrication to some extent, they are not as heavily dependent on it as the other listed components, which endure continuous direct contact and loading. Hence, they are typically more resilient in situations of low lubrication, making this choice the least likely to experience failure under such conditions.