jtcfanof3

Hey everyone,
Little background,motor is a 5.7 out of an 87 Firebird,tranny is a 700R4.this has been swaped into my 88 S-10 Blazer.This motor was converted from TPI too carb and all wiring basically gone.Now,I want to wire up the TC to lock up manualy.I have the low vac switch that woorks well,she downshifts when on the throttle for passing and w/e,but I also need it to lockup for highway use.I still have the plug that is listed A and B with gray wires running too this plug(see below pic).What do I need to make this lockup the way it is now,I know I need a 12v ignition source and a ground and a rocker switch.But which wire goes where?
What was this plug pluged into?

My blazer was an auto but no cruise,so I dont know if it has a N/O brake switch.
Thanks

ed o

I'd buy a 1 wire kit as you mention the wiring is essentially gone. the four wires coming out of the trans will be 1 with that kit. that will ease the agony. install a normally open fourth switch into the valve body (closest to 1-2 accumulator), use a 2 wire tcc solenoid. hook the black directly to the fourth switch. run the red out of the case and connect it in line with a new toggle and vacuum switch. make sure to use a brake switch to interrupt the power to the trans. This mod will allow lockup in fourth gear(fourth switch will provide the ground when in fourth)-provided the power to the trans is on. you can check the fourth switch for normally open by using an ohm meter. ground one end to the valvebody the fourth switch wire disconnected, and touch the other end to the terminal there should be no resistance(with pressure to it it will give resistance). make sense?

jtcfanof3

Ok,wired a lighted rocker switch with a 12v source then too wire A on that plug,now when that switch is fliped it will lock up in 2,3,4,but Im only using it for highway cruising in 4th so Im good,just hafta remember to flip the switch when coming in town.It does have a little more delay in the kickdown,but the low vac switch works the way its supposed to so Im happy.
Im utilizing a stock foglight switch housing to keep the look simple on the dash.