installed a 90 corvette 350 w/700r4 trans.and computer. - in o.d. problem now is when coming to a stop,the engine drags down and stalls. if i put trans in 3rd gear,it is ok and does not stall. any solutions ?? it's a buddy's car.
thanks.

I remember reading here about a wire/signal from the brake pedal going to the trans, or ECM, to release the OD clutch. Probably could do a search here in this forum to find an answer or, soeone with knowledge will give how-to instructions.

From the BowtieOverdrives website:

Most vehicles that came from the factory with 700R4/2004R Transmissions typically used a computer to control the 12v circuit that controls the engagement of the torque converter clutch. Torque converter clutch engagement is the only function controlled by a computer on Th-700R4 and Th-2004R Transmissions. Using one of our wiring kits completely eliminates the need to use a computer when installing one of these wonderful overdrive automatics into a non stock application.

Check out their website... tons of information there.

Bowtie Overdrives (http://www.bowtieoverdrives.com/catalog/catalog.php?Action=GETSUBCAT&CATID=O)

There are two very simple ways to solve the problem. You can replace his brake light switch with a GM cruise control switch, GM# 25524848. It is a direct replacement. This switch has two separate switches in it, and was used to disengage the cruise control when hitting the brakes. The two terminals closest to the plunger are normally "open", and illuminate the brake lights when you hit the pedal.. Use the other two terminals to disengage the lockup when you hit the brakes. these are normally "closed".

To wire it, run your "keyed on" 12v source to one of these two terminals. Run the wire to your converter lock-up solenoid to the other terminal and you're done.

The other way is to simply install a toggle switch in the TCC line.

I actually have BOTH switches on my TCC line, and leave the toggle switch open when driving around town. I flip the switch to lock the converter when I'm on the freeway.

Yeah, been doing a lot of research on this one. Have decided that a simple solution is the one described above. An open ckt created by a brakeswitch with a made contact that is normal. A normally made contact that breaks when you hit the brake.

There a cheaper way to wire this, since the brakes are made hot. A simple relay hooked with the operate path to the brake lites and a normally made contact will do the same thing. These probably cost 10 bucks even at a good parts house, not discounted. This relay should operate as brake is hit and cause an open ckt to the grd side of the solonoid in the tranny. The hot side it created from the fourth gear sensor and you seem to have found it and hooked it to the other side of the solonoid, otherwise you would not have it working at all to lock up.

There a cheaper way to wire this, since the brakes are made hot. A simple relay hooked with the operate path to the brake lites and a normally made contact will do the same thing. These probably cost 10 bucks even at a good parts house, not discounted. This relay should operate as brake is hit and cause an open ckt to the grd side of the solonoid in the tranny. The hot side it created from the fourth gear sensor and you seem to have found it and hooked it to the other side of the solonoid, otherwise you would not have it working at all to lock up.

I had a hard time deciphering what you were trying to say.....but the ground side of the solenoid is the transmission case/chassis ground.

As to cost, the GM cruise control switch is ~$15, and a toggle switch is about $3.