Manual Gearbox and Automatic Transmission

There are a few telltale signs that can indicate when a manual gearbox or automatic transmission is in trouble. In both automatic and manual transmissions smooth operation is ideal. Odd noises and rough gear changes may be the first indication that something is beginning to fail internally. Taking quick action when things start to feel a bit funny can help to keep repair bills to a minimum.

In a manual transmission, a grinding noise that occurs when shifting may be the result of a worn synchronizer. It could also be an indication of a low fluid level, so having the fluid level checked at the first sign of noise is a wise move.

A manual transmission that is difficult to get into gear could have issues with the linkage system connecting the shifter to the gearbox. In some cars these linkages can be realigned to restore trouble-free shifts. This could also point to an issue with the clutch hydraulic system, so a little troubleshooting may be needed to find the real culprit.

A slipping clutch is usually indicated by a climb in engine RPM without any increase in vehicle speed. Luckily, there is a simple test to check for this condition. It is conducted by accelerating from a low RPM through the engine's peak power band (where it makes its optimal horsepower and torque) in fourth gear. Liberal use of the throttle in these situations will generally cause a weak clutch to slip without any real risk of damage.

Automatics can be a little trickier to diagnose. Just as with their manual counterparts, a flare in RPM during acceleration may indicate a slipping clutch. Since automatics use a number of different clutches, the problem may be isolated to one gear.

Excessively rough shifts in all gears may indicate problems as well. Luckily, modern automatics are computer controlled, which means they can be interrogated with a technician's scan tool. This is an excellent way to begin diagnosing any shift concern.

The overwhelming variety of transmission designs and configurations means that shift quality and feel will be very different from car to car. This is why it is important to become familiar with the way a particular transmission (manual or automatic) feels when it is working properly. If something feels off in a vehicle you use every day, odds are something may not be right. If such issues are given prompt attention, the early action may reduce future headaches.