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the wire number is 315 and it is for the kick-down feature. Yes the fan control is on the injection pump too.

Ok I thought that I was loosing my mind, but after further investigation I have discovered this. The 3L80 is the newest version of the THM400. When they went to the new trans. naming system the 400 became the 3L80. Second, it does infact have an electric kickdown solenoid. The switch is...

the trans. is a 3L80. The 3L80 and the 400 are the same except for one thing. The 3L80 had a lockup torque converter. However all other parts are the same. They both have an electrical downshift solenoid in the valve body. I do appoligize for my mistake. The solid state relay by the washer...

Before you tear it down try this. Open the hood. On the drivers side by the washer pump there is an electrical connector. Unplug it and see if it will shift then.