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I tried for an hour to search for this transistor and cable assembly.
the white connector is the new pigtail to be installed at the trans. The other end with the black connector has the transistor soldered in.
The white connector will fit properly it seems into the old connector at the other end that's why I assume another pigtail exactly the same will fix that end.
Last edited by ToniJ1960; Jun 27, 2017 at 02:58 AM.
You need to see someone that knows transmissions.
run the car on a lift, connect a gauge to the pressure ports.,.
The servo on the right side of the case has two pistons in there, the one inside the cover is the actual 4th servo.
It pushes on a pin, that closes a big band that's used for both second and 4th...
otherwise it may end up being in the valve body, or further in.
also, on my transmission, if i have my tv cable to tight, i don't get 4th until something like 70mph, however I'm npt sure if that's related to my shift kit...
he also thinks this cable piece might be an aftermarket lockup controller. red black and white wires doesn't look to be correct for my 84 tcc. he could be right on that has anyone here seen this part before, should there be only one connector between the ecm/brake switch and the tcc at the trans? This just got stuck in between by someone at some point?
Last edited by ToniJ1960; Jun 27, 2017 at 01:31 PM.
It could be a diode. The TCC solenoid is supposed to have a diode on it.
But that's all it runs is the TCC clutch. No other solenoids in a 700.
Its a TO 220 I would bet its a transistor, and I never saw a transistor or an scr in the diagrams we all see.
The diode across the coil is just an emf suppressor for the flyback voltage across the coil. The diode is placed across the coil reverse biased so it wont affect the current through the coil, but it will break down or conduct at a certain voltage point. It just breaks down and conducts to protect the coil or transistor or whatever from the flyback that would be produced (high voltage from collapsing current/field).
Im sure its mounted right at the solenoid terminals.
This guy who looked at the transmission said he thinks it could be a controller for the lockup maybe aftermarket. He could be right Im leaning towards leaving it out right now at least.
Last edited by ToniJ1960; Jun 28, 2017 at 04:29 PM.
The diode is a flyback diode, yes.. But there's nothing there that needs a transistor.
You could pull the pan and see if they did anything, I guess..
There might be a normally closed (instead of N.O. 4th gear switch used on some controller kits I read.
The transistor might operate with the emitter or the base grounded (or connected to the 4th gear switch?) and act like a switch to control some (usually) larger current. So if its in 4th gear and the switch is closed the emmiter is at ground and it switches the transistor on. I haven't worked it out yet on paper but it seems pretty likely. It could be PNP even.
Last edited by ToniJ1960; Jun 28, 2017 at 07:58 PM.
