can you make the converter on the 700 lock up by toggle swith with oput going thru the adapter kit that use vaccum. If so which wires are used. The truck is mainly used off road.

thanks for the help

I could tell you try the "search" but I'm in a good mood. Ther are 4 wires on the side of the trans. that control the "lock-up' converter. You need the use a multimeter to find the 1 wire that you hook to 12v to lock it. It been a while since I did this....you can pull the pan and fillow the wire to the "valve body" I think the (red) wire is the 12v one you need to hook up. :D :beer:

Another "newbie" to welcome guys.....:flipoff2: :flipoff2: welcome:D :beer: :smokin:

What is the tranny out of (year?)? The early ones basically just had a wire that was hot whenever the brakes were not on, I think there was also a low vacuum cutout switch (ie the converter would unlock with low vacuum, like at full throttle).

Pete

thanks for not flaming me ,but i did the search and they only thing I came up wit was wiring kits for 150 dollars and new there had to be a way to hook it up with just a switch.

I have a 1985 model tranny with just three wires coming out the side, yellow, blue and green. If you could teel me what those 3 wires do by color i can rig the rest up

thanks again.

I've got the '83 diagram at home, I'll try to take a look at it tonight. Pretty sure its the same as an '85 (at least in a truck).

Pete

yea it should be the same mine came out of a fullsize blazer

Note: this is from an '83 diagram, I'm not positive they are the same. There were substantial changes made to imporove the reliability of the 700s around Oct. '84, not sure what they did, though.

There were two different setups, a 2 wire and a 3 wire. The 3 wire appears identical, but with an extra circuit that is NO (normally open), and grounded when the TCC is engaged and the 3rd clutch is engaged. This is the yellow wire, and it goes to an EGR bleed solenoid. Ignore this wire.

The light blue wire (terminal B) is hot whenever the brakes are not on. It also provides power to a low vacuum switch (NC--normally closed). The other side of this switch goes through a relay that is NC, except when in 4wd (open then). From the relay, a lt green conncects to the trans (connector A).

Inside the trans, terminal B connects to the TCC when in 4th gear only, and also goes through a NC, momentary switch that opens on the 4-3 downshift. Terminal A is connected through the same momentary switch. So terminal A is always connected to the TCC, except during the 4-3 downshift.

Basically, the TCC gets power when in 4th gear and not on the brakes; or when vacuum is high, not in 4wd, and not on the brakes.


Pete

Not sure how its done but my Rossi Racing Transmissions 700R4's I've used in years past would shift into lockup automatically on cruise (low load) in 3rd or 4th gear. One unit had a high stall 2500rpm converter--when I would down shift from thrid to second manually at lower rpm's I would have less compression braking in second gear cause the converter would unlock! I think it was all done in the valve body--no 12V or any wiring needed to the transmission.

Jason :)