What is the best way to make these transmissions stay locked up in 3rd? I am having trouble keeping the converter locked with the trailer behind at highway speeds, which results in higher trans temps than I would like to see. Thanks.

Need more info.What vehicle?How heavy is trailer?High wall TT with lots of drag?What speed are you having trouble with it staying unlocked?Do you have a K&N type oiled aid filter*?Let's assume there is nothing wrong with the trans and torque converter......The computer controls the trans and TC lockup. It won't lockup until you get to a certain speed/load as dictated by the computers tune file.There are many factors and sensors that play into the trans shift strategy. It will unlock or lock depending on speed, rpm, perceived load*, throttle position, etc.*The MAF (mass air flow) sensor is a major player in reporting load. If oil film from a K&N air filter gets on the sense wire it can cause problems for the trans pressure.Also the brake pedal switch will unlock the TC. Is it bad, are you a two foot driver that rests his foot on the brake pedal?

http://www.hptuners.com/Need to find a tuner shop that knows their stuff. It's been a few years since I dabbled in GM tuning so I'm not current on who's reliable. No doubt someone else will have thoughts on that.That's not the strongest trans anyway, so locking the TCC will help, but...

It's a 92 k1500, 6,000lb high side trailer. Won't stay locked up over about 45-50mph. Trans is in good shape, is there a way to wire the torque converter lockup solenoid to a toggle switch so that when towing I can hit the switch? Trans temps in the pan are hitting 205-210 when trying to maintain 55-60mph.

lt1tyrell wrote:It's a 92 k1500, 6,000lb high side trailer. Won't stay locked up over about 45-50mph. Trans is in good shape, is there a way to wire the torque converter lockup solenoid to a toggle switch so that when towing I can hit the switch? Trans temps in the pan are hitting 205-210 when trying to maintain 55-60mph.Ok, 4L60E came out in 1993. I think the 700R4 was renamed 4L60.... No E in 91 or 92.Look at the throttle linkage for a throttle VALVE cable and or lockdown cable. If you have these it is not computer controlled.

Yup I know it is a 4l60 with a tv cable. Already has a big cooler installed and a gauge with the sender in the pan. It works great other than the fact that I can't keep it locked.

4l60 torque converter won't stay locked | Good Sam Community

Ductape
Explorer
Jul 20, 2015
http://www.hptuners.com/

Need to find a tuner shop that knows their stuff. It's been a few years since I dabbled in GM tuning so I'm not current on who's reliable. No doubt someone else will have thoughts on that.

That's not the strongest trans anyway, so locking the TCC will help, but...
marcsbigfoot20b
Explorer
Jul 20, 2015
Need more info.

What vehicle?
How heavy is trailer?
High wall TT with lots of drag?
What speed are you having trouble with it staying unlocked?
Do you have a K&N type oiled aid filter*?

Let's assume there is nothing wrong with the trans and torque converter......
The computer controls the trans and TC lockup. It won't lockup until you get to a certain speed/load as dictated by the computers tune file.

There are many factors and sensors that play into the trans shift strategy. It will unlock or lock depending on speed, rpm, perceived load*, throttle position, etc.

*The MAF (mass air flow) sensor is a major player in reporting load. If oil film from a K&N air filter gets on the sense wire it can cause problems for the trans pressure.

Also the brake pedal switch will unlock the TC. Is it bad, are you a two foot driver that rests his foot on the brake pedal?

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4l60 torque converter won't stay locked

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