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6 Most Common Gearbox Problems [That may lead to unnecessary repair]

Detect Your Cars Gearbox Problems

The most common gearbox problems is overheating this issue requires industrial gearbox repair and renewal. The other common warning signs of gearbox problem that may lead to unnecessary gearbox repair costs are fluid leak, vibration, noise and oil contamination.

gearbox problem
Source: cars24.com

If your vehicle is not running smoothly and shaking and producing grinding sounds then there must be an issue. It could be a sign that there is a problem with the gears.

If you still not getting what is the actual problem of your gearbox, then we have a list of the gearbox problems and their causes are as follows:

6 Different Types of Gearbox Problems and There Causes:

Following are the 6 common gearbox problems:

  1. Grinding noise in neutral
  2. Noise in gear
  3. A hum or bowl in neutral
  4. Hard shifting sticking in gear
  5. Oil leakage
  6. Slipping out of gear

1. Grinding noise in neutral

A grinding noise occurs when the engine is running and the vehicle is in neutral its causes are: Gearbox not properly aligned with the engine causing the shaft from the flywheel to the gearbox to bind.

Read also: Types of Gearbox

2. Noise in gear

When the vehicle is being driven or rear wheels turning off the ground, noise is heard in gear. Its causes are:

car problem
Source: miway
  1. Dry rear bearing on main shaft.
  2. Damaged speedometer drive gears.
  3. The noise heard in neutral will also be heard in gear but will be more pronounced.
  4. Noise occurring in the rear end and in the clutch may also seem to come from the gearbox.

3. A hum or bowl in neutral

When the engine is running is occur due to the following reasons:

  1. Lack of lubrication.
  2. Worn shaft.
  3. Too much backlash in the gear train.
  4. Too much end play in gears or countershaft
  5. Gear chipped, burred, improperly matched or badly machined.
  6. Gearshift forks rubbing in grooves causing gear interference.
  7. Worn bearings.

4. Hard shifting, sticking in gear

It occurs due to the following reasons:

Hard shifting, sticking in gear
  1. Distorted splines of the main shaft.
  2. Too strong shifters lock spring.
  3. Improper clutch adjustment.
  4. Battered gear teeth.
  5. Remote control shifting mechanism out of adjustment.

5. Oil leakage

Oil leaks from the gearbox due to the following reason:

  1. Too high oil level in case.
  2. Damaged or improperly installed gaskets or oil seals.
  3. Loose cover bolts.
  4. Cracked case or cover.
  5. Loose drain or filler plug.

6. Slipping out of gear

  1. Too much clearance between teeth in mesh.
  2. Insufficient mesh of gears.
  3. Worn gears or bushing or bearing retainers.
  4. Weak or broken shifter lock spring.
  5. Remote-control shifting mechanism out of adjustment.
  6. Improper alignment of gearbox with engine.

Lubrication of Gearbox

Proper lubrication gear of box is extremely important. The transmission gears operate in a bath of lubricant. The gearbox should always remain filled with lubricant. It prevents metal-to-metal contact which would generate so much heat that the gear teeth would be burned away. It lubricates bearing of the gearbox.

Lubrication of Gearbox

Different designs of the gearboxes have different requirements. Some car makers recommend engine oils for gearboxes, with overdrive. Synchromesh gearbox and some overdrive units require fluid gear oil of SAE 80 or 90 viscosity.

Expect during very cold weather, different, viscosity lubricants are no longer recommended for the gearbox at different seasons of the year. The lubricant level in the gearbox should be inspected every 1000 miles and filled if necessary. If the lubricants have become contaminated, the gearbox should be drained, flushed and refilled with fresh lubricant.


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Saif M
Saif M. is a Mechanical Engineer by profession. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. He is also an author and editor at theengineerspost.com