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TPI transmission control

Hossbaby50

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I have heard different things on this and want clearity.

I was told that when I install my VSS on my truck for the TPI swap I did that I hook the VSS up to the computer, and then I will plug in the square 4 pin harness to my 700R4 (remove the stock one)

The TPI computer should control my transmissions lockup and the other functions of my transission right? I am confused on this because I thought the TV cable controlled lockup and kickdown.

What exactly does the 4 pin connector in the trans doo and what will the computer take care of when I install its 4 pin connector? Thanks for any clearification.

Harley
 

4X4HIGH

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The square 4 pin connector you speak of on the driver side of the trans should actually only have 3 wires in it and it controls lock-up feature of the converter. The TV (throttle valve pressure) cable is for adjusting the upshift/downshift points.
 

dyeager535

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It might be wired to work with the 3/4 pressure switches (if present in the particular 700R4) but that is for TCC.

Until 4L60E, the transmissions don't need an ECM to work.
 

HarryH3

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From my (admittedly) fuzzy memory:

One wire lets the computer know when the tranny is in 4th gear.
One wire lets the computer tell the tranny when it's OK to engage or disengage the TCC.
One wire provides 12 volts, through the TCC switch on the brake pedal.
 
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