on automatic transmission
Your transmission is most likely a 4T60E. If so, it has no modulator valve. This transmission is electronically controlled from the ECM. Line pressure, which is what the old modulator valve controlled, is now controlled by an internal pcm solenoid.
There is no modulator valve on the outside of this transmission.
A 1999 Jeep transmission does not have a modulator valve.
The 1996 Mercury Villager modulator valve can be found on the firewall in the engine compartment. The modulator valve will be on the passenger side of the firewall.
Correction: It is a 1995 Chevy Corsica. Not a 1996.
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10w30 premium oil.
WHAT DOES THE DIAGRAM SHOW?
Dot 2