Join Date: May 1999
Location: SE Florida, USA
Modulation started in 1999. You don't have it.
If you did, you don't gain anything by changing it. Both methods get complete 100% lockup. Only the means of getting there changes.
In the older system that you have the solenoid is on or off. When it is turned on the rate of the converter clutch apply is controlled by a hole in a separator plate. Pressure can only go through the tiny hole so fast. With the modulated system the rate of apply is controlled by the computer modulating the solenoid. This gives far greater control and can make the lockup more consistent. The computer monitors the apply time and can adjust on the fly so that the lockup always takes the same amount of time. This system also gives more control to allow the converter clutch to slip for a fraction of a second during a shift, which helps with shift feel.
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Automatic Transmission Engineer 1988-2007
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson