1974 Pontiac Trans Am Transmission - Shiftless Pleasure
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Here is the wiring diagram for the TCU and transmission for reference. The wiring is coded C1 to C12 for ease of installation. C3 provides a computer hook up for the laptop. C4 goes to the distributer to get an rpm reading so the TCU can set WOT shift points. C6 must be wired to a switch on the dash to enable the Performance shift mode. If the wire is not grounded via a switch, the trans will stay in Economy mode according to GMPP. C8 is plugged into C9 and they control the torque converter clutch function. C10 gets taped off, and C11 is optional for a slapstick-style shifter. C12 plugs into the bottom left-hand port of the TCU and is secured with 1/4-inch-head bolt. There is also a black ground wire from the harness to the battery to reduce electrical noise to the TCU, and there's a pink ignition wire that has to be connected through a 10-amp fuse to the fuse box to receive 12 volts only when the ignition is turned to On. View Related Article
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