What is the LEAST LIKELY step performed during an automatic transmission fluid and filter service?

Installing new friction discs into the clutch packs is the least likely step performed during an automatic transmission fluid and filter service because this particular procedure involves a more in-depth repair or overhaul of the transmission, rather than standard maintenance. The fluid and filter service typically focuses on the replacement of the fluid, changing the filter, and performing an inspection of the transmission pan for debris or signs of wear.

Replacing the transmission fluid and changing the filter are routine tasks designed to maintain proper operation and longevity of the transmission system. Inspecting the transmission pan is also a standard step in this service to identify any potential issues or contaminants in the fluid, such as metal shavings or sludge that could indicate internal problems. Thus, the correct answer reflects a common misconception that may confuse standard maintenance tasks with more extensive service procedures.