Transmission Diagnoses

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Please add to these Transmission Diagnoses and Corrections based on your experience.

Difficulty Switching Gears

• First gear won't go in if car rolling
  • By design: 1st gear is not sychro
• Noise, trouble shifting into one specific gear
  • Bad synchro
  • Bad gear, perhaps chipped

Slips Out of Gear

Although rarely occuring this is one of the weak points of the 56- and 60- transmission designs.

• Shifter mechanism
• chipped gear

Noisy

Component Determination

Try to determine if it is a transmission or some other component:

• Clutch pedal down, noise goes away. Clutch pedal up, noise starts
  • Transmission input shaft or counter gear
• Noise only when clutch pedal depressed
  • Throwout Bearing is bad
• Noise at any gear, at certain road speed
  • Differential
• Vibration in any gear, at certain higher speed
  • Propeller Shaft
• Noise in a particular gear over a range of speed. No noise in lower or higher gear
  • Transmission

Potential Causes

• Low on gearbox oil
  • Leak
  • Not filled with enough oil
  • Filled too full
• Worn bearings (whine at high speed)
• Bad bearings or bushing (knock at low speed)
• Clunk - worn splines

Vibrations

See main article: Vibration