Which of the following could cause a transmission to jump out of direct gear, EXCEPT:

• A. Bell housing not aligned
• B. Engine crankshaft has too much end-play
• C. Shift lever extension too heavy
• D. Clutch disc worn

Answer: (D)

Jumping out of direct gear is usually caused by misalignment or excessive movement in the drivetrain that lets the engaged gear lose its hold under load. If the bell housing isn’t aligned, the input shaft and the gears don’t mesh cleanly, so the direct gear can pop out as you apply torque. Too much end-play in the engine crankshaft lets the input shaft move axially during operation, breaking the mesh and causing the gear to disengage. If the shift lever extension is too heavy, the extra leverage can push the shift forks and the gear out of position, leading to a missed or popped-out gear.

A worn clutch disc, on the other hand, mainly causes slipping and poor torque transfer rather than actively forcing a gear out of engagement. It affects how well the engine’s power is transmitted to the transmission, not the engagement stability of the gears themselves. So it’s the exception.