Transmission, rear axle, auto repair, gears find out how they work.

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Drivetrain

Systems:
    Engine
   Fuel
   Exhaust
   Cooling
   Drivetrain
   Suspension
   Electrical
   Body
   Brakes
   Heat/AC
   Oil / Lubrication

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Drive Train:

Before you start work, make sure you have a good repair manual. We recommend and use an online manual from ALLDATA.

Common Problems:

Manual transmission suffer from wear mainly in the synchronizers. The synchronizers make shifting easier and help to prevent gear clash. Over time the synchronizers, which are made of brass, can wear out causing hard shifting and grinding.
Automatic transmissions can also wear out, causing slipping and uneven shifting patterns.
Universal joints can wear and cause vibrations while driving. Many newer universal joints are sealed and can not be lubricated, leaving replacement as the only option.

Preventive Maintenance:

Change the fluid in your transmission at recommended intervals. Your owners manual will give you a time schedule in miles and or months. If you tow a boat or trailer be prepared to change the fluid even sooner. Most owners manuals will give you recommend intervals for severe use like towing or off-road use.
Do not "ride" the clutch if you have a manual transmission. Learn to release the clutch in a smooth motion without revving the engine too much. Revving the engine too much while pulling out can cause premature wear on the clutch.
If you do tow a boat or trailer, consider getting a transmission cooler for your automatic transmission. Temperatures can approach the boiling point in severe conditions. Most newer trucks come equipped with transmission coolers if sold with a towing package.
Make sure your universal joint are lubricated at oil changes if they are the type which can be lubricated. When replacing universal joints try to find replacements with lubrication fittings so you can lubricate in the future.
If you have a front wheel drive car, avoid applying the gas to the floor while the wheels are turned at full lock. This puts stress on the universals and can cause premature failure. This can happen when stuck in the snow and trying to get out.

What to discuss with your mechanic:

If you are noticing a vibration in the car while driving, make sure to describe when it happens. While accelerating?; braking?; Maintaining speed?; When turning?