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Old 10-08-2008, 06:30 PM #1
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Lock up converter?

I am new here and have a 98 3.4 with Auto tranny. I am wondering if it has a lock up converter? If so can a manual lock-up switch be installed? I have done this on a 700R4 in a hot rod, but would like to do it on my runner to help in steep downhill kinda like the Downhill assist control on the 4th gen with out the EBC added. Thanks and lots of good info as i have seen on other threads.
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Old 10-08-2008, 09:56 PM #2
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like on the 4th gens brakes? or are you talking about the tranny? ether way, beats me
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Old 10-08-2008, 11:58 PM #3
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I remember that trick from the Grand National crowd. I just did some research on the this for 3rd gen. I'm not positive when it locks from the factory, as the only info i have on the toyota auto trans is from the autoshop101 website, which states it locks above 37mph, and in high gear. This is general toyota info though, so not sure if the 4runner is exactly the same. i would probably want to do a little bit of research on this before spending the time to modify it.

As far as doing the modification, i do have the wiring diagram for the 00 4runner, if you don't have a 00, then i suggest spending the $10 on a day pass for the TIS website, anyway the wire can be found at the engine ECU, terminal #9 and is listed as green w/ red stripe. It should be a Positive trigger. If you want to do it at the transmission side, it is listed as a yellow wire in terminal 3.

This would be an interesting project, if you have time to play w/ it before i can keep us posted!
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Old 10-09-2008, 12:03 AM #4
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i still cant figure out what u guys are taking about, care to explain what this tranny thing does?
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Old 10-09-2008, 12:10 AM #5
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http://www.autoshop101.com/forms/AT21.pdf

scroll down to the torque converter explanation.
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Old 10-09-2008, 12:26 AM #6
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Thanks stick, now im starting to learn, earlier i had no idea how TC worked, thanks!
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Old 10-09-2008, 12:37 AM #7
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Basically the TC works off of inertia and allows slipping. With a lock up converter it acts more like a clutch to help with fuel economy usually once at a set speed on fwy. A manual locking button would allow you to engage it(eliminating the slip) when you want such as downhill to utilize more engine breaking like you would have with a manual transmission. I was hoping that maybe someone had already done this but if I need to be the first I will keep you posted.
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Old 10-10-2008, 01:46 PM #8
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did you use a b&m lock box on the 700R4 maybe they make one for your app.
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Old 06-22-2021, 03:34 PM #9
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Wanted to know if anyone has installed or understands how to install a switch to interrupt the torque converter lockup on a 1998. I don't want it to lock under some circumstances, so would be looking to interrupt the 12V signal that would normally tell the transmission to lock up while in 4th. I would be doing the opposite of this thread, not looking to manually lock, but instead a switch to manually keep the torque converter engaged and not lock up.

I think it would just simply be installing a toggle switch and interrupt the wire that sends the lockup signal. "On" would keep the signal intact for normal transmission function. "Off" would interrupt the signal and keep the torque converter from locking up.
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Old 06-22-2021, 04:04 PM #10
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I think it would just simply be installing a toggle switch and interrupt the wire that sends the lockup signal. "On" would keep the signal intact for normal transmission function. "Off" would interrupt the signal and keep the torque converter from locking up.
Ur right. the ecu can tell when something is messing with the lock up and completely disable said (no more lock up), u have to turn the vehicle off and restart to retest the ecu.
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Old 06-22-2021, 05:04 PM #11
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Quote:
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Basically the TC works off of inertia and allows slipping. With a lock up converter it acts more like a clutch to help with fuel economy usually once at a set speed on fwy. A manual locking button would allow you to engage it(eliminating the slip) when you want such as downhill to utilize more engine breaking like you would have with a manual transmission. I was hoping that maybe someone had already done this but if I need to be the first I will keep you posted.

I made a drawing a few years ago and posted it using the brake as a unlatch so you donít stall.


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Old 06-22-2021, 06:34 PM #12
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I did some snooping in the FSM and it looks like the "SL" solenoid (not S1 or S2) is the one that controls the torque converter lockup function. Does that seem correct? I can't remember if the solenoids have a single wire or two wires running to each, it's been a long time since I had the transmission opened up.
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Old 06-23-2021, 12:11 PM #13
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I did some snooping in the FSM and it looks like the "SL" solenoid (not S1 or S2) is the one that controls the torque converter lockup function. Does that seem correct? I can't remember if the solenoids have a single wire or two wires running to each, it's been a long time since I had the transmission opened up.
They have a single wire & as memory serves SL is correct. This is whats inside ur trans:

Lock up converter?-a340-2-jpg
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Old 10-03-2021, 01:53 AM #14
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Has anyone made a lockup for their 3rd gen? I bypassed the radiator for the tranny and send it through a separate K&N cooler which is kind of small. Most of the time it's fine but when I go up steep hills at moderate to low speeds it overheats fast. On my last trip it briefly went up to 230 F, but usually I'm at 190 or below. What's interesting is that at 80 km/hr or above, going up a hill it locks up by itself when I hit Overdrive Off and ETC. But not at lower speeds so I want to manually force lockup then.
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Old 10-03-2021, 01:37 PM #15
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Has anyone made a lockup for their 3rd gen? I bypassed the radiator for the tranny and send it through a separate K&N cooler which is kind of small. Most of the time it's fine but when I go up steep hills at moderate to low speeds it overheats fast. On my last trip it briefly went up to 230 F, but usually I'm at 190 or below. What's interesting is that at 80 km/hr or above, going up a hill it locks up by itself when I hit Overdrive Off and ETC. But not at lower speeds so I want to manually force lockup then.

I have a dead man switch to manually force lockup but with that said I use very sparingly and carefully when maintaining consistence-ish RPM when wheeling/offroad and occasionally for town driving when its hot outside and not able to get up to speed for long periods for the ECU to engage said. I use a dead man so I don't forget to disengage and damage the TQ. I also have extra Transmissions and can replace said without to much issue, only making this point because u can damage ur trans messing with said. the ECU can tell when u r manual messing with lockup and will completely turn TQ lockup off... U have to turn the vehicle off and restart to clear said from the ECU and it will restart lockup as norm
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