200R4 switch controlled torque converter lockup

[LukeZ]

Hey all,

Is it possible to control the torque converter lockup on a 200R4 via a switch? Is there a fuse in the fuse box for the lockup - if not, where could I find the wire? I'm pretty sure it's electronically controlled - right?

Long story short, my car just about stalls out in 4th gear when the torque converter locks up because it goes into 4th gear so early. I've been having to leave the car in 3rd and then manually shift into 4th after the car is going fast enough to where it runs right. I don't want to continue doing this though because it's an automatic, not a manual haha. I also don't have the facilities to adjust the shift points. I'd rather be able to initiate the lock up after a certain speed.

From a cold start the car runs in 4th fine, it's just after it warms up and the torque converter locks up in 4th at 28mph that it chugs and shakes and rattles because it's at about 100 rpm lmao

 

[melloelky]

Does your trans have the four pin or the single connector on the side?

 

[79 USA 1]

Does it stall out when you come to a stop with it in overdrive? I have a 88 SS Monte Carlo that was doing this and it was a bad lock up solenoid in the transmission. By the time you rewire a switch for the lock-up you could drop the pan and replace the solenoid. TCI sells replacements through Jegs and Summit. Summit even has a kit with the pan gasket. If you do not have time or resources to do the job a local transmission shop should be able to get it done.

 

[64nailhead]

Probably ought to fix what's wrong with it. You shouldn't be in 4th gear at 28 mph.

I'll guess governor springs laying in the pan, but only a guess. How does it shift for the other gears during a normal acceleration when left in drive?

 

[melloelky]

I had the same problem,i replaced the pressure switch and solenoid and there was no change.under sixty on the highway it would buck.i think it was due to the stall.i put in a switch.i've had the same thing with two transmissions now.

 

[LukeZ]

Does your trans have the four pin or the single connector on the side?

I'll check on Saturday when I change the oil!

 

[LukeZ]

Does it stall out when you come to a stop with it in overdrive? I have a 88 SS Monte Carlo that was doing this and it was a bad lock up solenoid in the transmission. By the time you rewire a switch for the lock-up you could drop the pan and replace the solenoid. TCI sells replacements through Jegs and Summit. Summit even has a kit with the pan gasket. If you do not have time or resources to do the job a local transmission shop should be able to get it done.

No it doesn't stall out when it stops, I meant that when it shifts into 4th OD with the lockup the rpms are so low that it is getting ready to stall out. I think the solenoid might be okay in that case but I'll check the kit out, thanks!

 

[LukeZ]

Probably ought to fix what's wrong with it. You shouldn't be in 4th gear at 28 mph.

I'll guess governor springs laying in the pan, but only a guess. How does it shift for the other gears during a normal acceleration when left in drive?

All the gears shift fine, and it's fine when it's in 4th at 30mph - drives good. It's just 4th with the lockup that's bad

 

[LukeZ]

I had the same problem,i replaced the pressure switch and solenoid and there was no change.under sixty on the highway it would buck.i think it was due to the stall.i put in a switch.i've had the same thing with two transmissions now.

Where'd you put the switch in? Where can I find the wire?

 

[64nailhead]

The switch is in the pan and the connector is on the driver side of trans just behind the shifter rod. Factory would be a 4 wire connector without 4 wires in it. And you shouldn't be in 4th gear at 30 mph unless you have 4.10 gears with 25" tires.