Originally Posted by oldmots

Braking with an automatic tranny is an exercise in equipment longevity. You are betting that your tranny friction pacs can last through it and the tranny is trying its best to fry the friction clutches in the drivetrain. Its a matter of time before your tranny wins the wager. If you have ever looked at the clutches you are using to slow th ecar, you will see they are about 7" in diameter and about 1/8" thick the same thing as a multiplate motorcycle clutch. They are pretty tough but you cut their life substantially by using them as brakes. Very poor cost management.