The major causes of transmission failure are centered around the condition of the ATF solvent blend.
Transmissions are built to function within certain range of temperature, this implies that if it functions above these temperature ranges breakdown will occur within the system and cause failure of other related components like Solenoid, Clutches, Band, Fibers and Torque converter just to mention a few.

That is why sticking to the manufacturers specified solvent blend can never be over emphasized.

Causes of Transmission failure:

1. Low transmission fluid level or fluid leak.

2. Transmission fluid level over fill.

3. Oxidized transmission fluid (dirty or burnt ATF due to over due service).

4. Parking on the gear.(Don’t park on your transmission parking pawl again before you shift your transmission lever to Park ensure that your parking brake is engaged; failure to do this will cause mechanical damage to the planetary gears).

5. Solenoid failure (caused by blockage of the solenoid filter as a result of debris-burnt and broken transmission fibers and Band).

6. Worn out torque converter (caused by low fluid level).

7. Worn out fibers, clutches and band(caused by increase in friction).

Like I said before now, the transmission solvent blend is the main culprit when failure occurs in the transmission, from the list above 1-3 are solvent blend related while 5-7 are the relative effect of 1-3 on the transmission.
How to avoid these causes:

1. Don’t rev the engine when a delayed engagement occurs. Increased engine speed produces friction thereby damaging the fiber, clutch and band.

2. Allow the transmission to engage before accelerating (30 seconds max for a good transmission).

3. Always check your solvent blend level, observe for burnt smell and debris.(if your vehicle does not have a transmission dip stick, insist its checked anytime you visit the workshop).

4. Ensure the correct solvent blend is used at all times (for both transmission and power steering pump because most times there cooling system are connected).

5. Every part replacement should be to manufacturers specification. STICK TO INFORMATION ON YOUR USERS’ MANUAL UNTIL IT’S PROVED OTHERWISE BY A RELIABLE SOURCE.
Be a fixer not a part fitter…. Stay dirty.
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