How can I access the transaxle fluid to put in an additive?

Transaxle fluid can be tricky. Most mechanics recommend changing or manipulating only when engine is running. I would recommend taking to a local mechanic or Jiffy Lube and letting them put in the additive.

with the 4 speed automatic transaxle there is a filler cap under the master brake cylinder-its easy access with the air filter hose removed. problem is there is no dipstick to see what level to be at.