94' Saturn SW2, I gave it a turn up, wires plugs and now the tranny shifts better. How is that?

My automatic tranny was slipping into reverse most times, or would take 2 seconds to engage, before I gave the car a tune-up. Changed the spark plugs, wires, fuel filter, air filter. How did that help the tranny shift better??94%26039; Saturn SW2, I gave it a turn up, wires plugs and now the tranny shifts better. How is that?
Other then if it was running poorly it should not effect the trans, if it was running bad then that is why. Maybe now the engine is happy so is the tranny. Maybe you should have a tranny service done too though if it is acting up, fluid and filter change. Good Luck94%26039; Saturn SW2, I gave it a turn up, wires plugs and now the tranny shifts better. How is that?
The computer determines when the tranny will shift up or down based on the engines ability to perform under the load. A tune up allows the engine to perform better. The computer recognizes it from the info it receives from the many sensors on the engine (oxygen, vacuum, idle...)

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