Weekly said:
Should I skip the "transmission service" to save money and just ask to have the transaxle oil and filter changed? there's nothing leaking on the ground from the bottom of my car.
You either pay now, or pay later. The transmission is the most complicated mechanical component in your car. Don't cheap out on this item. Once a problem develops with your trans, it is always expensive.
Transmission service is almost exclusively an oil and filter change. There is nothing else for the mechanic to do really if there is no problem.
In every single GM car I have worked on, there is a magnet on the bottom of the pan in addition to the filter. If you choose to get your trans flushed, you will not get the filings and clutch material off the magnet. Only about 66% of the fluid is changed during a service. The rest remains in the valve body and torque convertor.
As someone else has mentioned, Toronto is severe driving conditions. If you sit in traffic a lot in the summer, I would advise you to get a transmission oil cooler installed. Total cost for part and install should be about $150.
Almost the entire auto industry uses GM trans fluid of some type (Ford does not use its own Type F anymore). Dexron III is the standard right now, but there is now a new one out (6?) that has an extremely long life. It is backwards compatible, but I wouldn't go and switch at the moment because of the expense.
Don't forget to check the trans fluid when it is hot and the car is running in park.