He looked for rust "bleeding" from the bearing caps or any play in the shaft. Everything was tight, confirming the issue was internal to the gearbox. The Lesson Learned
Here is a story about a driver named Elias, whose quick thinking saved his truck and his schedule. The Shudder on the Grade jerking trannie
Elias was hauling a full load of timber through the pass when he felt it: a sharp, rhythmic jerk every time the truck tried to upshift. It felt like the engine was hiccuping, and the tachometer needle was bouncing erratically. Most drivers might have pushed through, but Elias knew that a "jerking" transmission is a truck’s way of screaming for help. He looked for rust "bleeding" from the bearing