An observation on my '84 Caprice 700R4 transmission hookup

[bobss396]

There is a plug that has not been hooked up for the past 26k miles. It is on the driver's side close to the bellhousing. The transmission shifts up and down fine, doesn't seem to overheat. Under full throttle starts, the 1-2 shift seems a bit delayed and harsh. Under normal driving, it is as smooth as silk. The overdrive works fine. The fluid and filter was changed 15k miles ago, the old fluid was slightly discolored but by no means scorched.

Anyone have any input on why this would be unplugged and what harm it can do to leave it as is. Don't want to open a can of worms if I don't have to.

Bob

[CD Smalley]

What color is the wire and where does it lead to???

[HuSSker]

It is your torque converter clutch plug. Your torque converter will not lock up with it unplugged. The plug is white with 4 plastic "prongs" that insert into the tranny plug vertically, correct?

[bobss396]

.. so if the converter is NOT locked up, what are the consequences? It has been like that for at least 3 years and 24k miles. I'd be interested in fixing it if I could do it myself or by a shop if it wasn't that expensive.

Thanks, Bob

[HuSSker]

All you should have to do is plug it back in. If it is working correctly, it will feel almost like an extra gear, and you should see lowered RPM's, improved fuel mileage on the highway, and lower transmission temps. When driving at say 55, once it gets into 4th gear, and you're on level road, the computer should let the torque converter lock up. If you are unsure if the TCC is applying, hold your right foot on the gas to maintain your speed, about 55, and gently press on the brake, just more than enough to cause the brake lights to come on. You should hear the engine rpm's jump up a bit, as the TCC disengages. Once you remove your foot, you should momentarily hear the TCC engage, as the RPM's should go back down.

Hope this helps.

[bobss396]

I had heard about converter lock up woes and knew little about them. Is this connected to a readily accessible switch that can be replaced?

So if I can pop the plug back in and take it for a cruise and see what happens without doing my car any harm, I'll try it at the next oil change. Right now, the overdrive seems to work at any cruising speed over 40 on a level road. And a little extra gas mileage can't hurt.

Bob