Automatic Transmissions

From Tim Hawley Master Mech.

Hello Guest,

You are correct, back in the hay day, Auto. Transmissions were self reliant.

They could be shifted manually or automatically based upon torque and flow from the torque converter. The shifting valve spool springs located in the valve body were modified to change the automatic shifting positions. They were changed to match the required horsepower to torque maximum power band positions needed for yesterdays true muscle cars.

Example: If you had a longer stroke engine you would want to staying the lower gear position longer to increase horsepower and torque to ramp up RPM's before shifting to the next higher gear position.

Todays Automatic transmissions (FRONT WHEEL DRIVE), use electronic solenoid valve systems controlled by a resistive throttle position sensor that is directly connected to the (ECM) Electronic Control Module. This allows smooth shifting transition and maximum fuel economy. But; it can still be controlled by manually shifting, and there are alternatives on the market.

The 2009-2010 3.6L Malibu has manual override, steering wheel-paddle shift +/-system that will make you brown your pants. Take one for a test drive you will be what I mean!

Best Regards,

Tim

P.S. > Don't forget to bring a newspaper for the seat.