Anyone do the torque converter lock mod?

ZPD · Jun 25, 2003

I am going to add a switch for second gear and was thinking about doing the torque converter lock too. Anyone have a bad experience with this or forgot to flip the switch off and spewed tranny parts all over the place?

link

ChuckD · Jun 26, 2003

Do you have time for this one, the CON is only 32 HRS away. :woohoo:

woody · Jun 26, 2003

I have done both on my 89 AW4 ...plus the TCU interrupt switch (so far unused) and like it. My motivation was a malfunctioning brake-switch where the TC stayed unlocked all the time...

I had a bit of learning curve, both on & off road but it is handy to select 1 or 2 and lock/unlock off road, and manually lock the TC on-road. I 'think' if your TC/brake sw at the pedal is functional...the tranny would be in 'normal/TCU' mode while the new sw is in unlock position.

I'd always reccomend a 'more frequent' ATF change schedule...especially if it gets hot one time.

ZPD · Jun 26, 2003

XJCHUCK72 said:
Do you have time for this one, the CON is only 32 HRS away. :woohoo:

Ya I don't know. I might just do the 2nd gear thing tonight. I think I am going to pull an all nighter tonight to do my shafts, and locker. I had to rip apart my dash last night trying to find a shorted out power wire going to my stereo. So it looks as if it just 3 of us going on the Con huh?

RCP Phx · Jun 26, 2003

Has anyone figured out how to do this on the the newer trans???

Steve88XJ · Jul 22, 2003

I've done it--- if you stop in any gear but 1st it will stall. The converter doesn't lock up in 1st on my '88 for whatever reason.

Ghost · Jul 22, 2003

I rode with Woody at the Crawl and let me tell you that lock-up and firs gear swith is sweet! If I had an AW-4 that would be my next project.

Steve88XJ · Jul 23, 2003

hell yeah I dont know how I went so long w/o it!

DPC · Jul 23, 2003

This might be a silly question but how exactly does locking the TC help off road?

Thanks

Dan

seanR · Jul 23, 2003

Can anyone point me in the direction to do this to a 2000?

ZPD · Jul 24, 2003

DPC said:
This might be a silly question but how exactly does locking the TC help off road?

Thanks

Dan

Without locking the TC you allow the TC to slip and build up pressure. If you are decending down a hill and you are in 1st gear, it will continue to speed up. If your TC is locked and you are going down a hill and are in first gear it is just as if you are driving a manual transmission in first gear down a hill.

XJHOX · Jul 25, 2003

OK a few questions. 1st can you start and stop with the converter locked up in 1st gear? can you start/stop w/ the converter locked up in any othe gear? Also does it matter what diode you use when you wire it up? Thanks Jason

RCP Phx · Jul 25, 2003

Diodes come with 4 different characteristics.
1-PIV(peak inverse voltage)
2-Ampere rating
3-Physical size
4=Lead size

PIV should be at least 25volts,I dont know the load of the solenoids but I would think 2A max.

flexj · Jul 25, 2003

This sounds like the next best thing to a full manual valve body. Is there a link or write up somewhere that gives more details? I've thought about locking out the tc but only for driving hills in 3rd and 4th on the highway. I've never thought about it for an offroad application. The 2nd gear thing, is that to get 2nd at a lower speed and totally bypass 1st? What do I do, what do I do? I like this idea.

Slip Kid · Jul 25, 2003

XJHOX said:
OK a few questions. 1st can you start and stop with the converter locked up in 1st gear? can you start/stop w/ the converter locked up in any othe gear? Also does it matter what diode you use when you wire it up? Thanks Jason

You cannot start or stop with the converter locked. that would be like starting in a manual without using the cluth. I've forgotten to unlock mine a few times, and it makes nasty noises when you get down too slow.

THE_OWL · Jul 25, 2003

I did the conversion on my 700R4 in the XJ
used the crusie control circuit on the brakes, and did a manual override button
with a Green LED so I dont forget. I know it doesnt help you guys with those silly little factory Transmissions and CPUs

GroversXJ · Jul 25, 2003

This mod would solve my only gripe I have had with my auto tranny off road,

. Have I just missed the link or has nobody ever done a quick write up for this mod? Thanks for the help.

ZPD · Jul 25, 2003

http://www.ilovejeeps.com/tech/article.cfm?ID=5

seymouj · Jul 25, 2003

I just read the write-up on that link and have a couple questions.

First, it seems the goal there is to manually force second but we want to stay in first right (for compression braking)?

If that is true, couldn't we just cut the line to solenoid 2 and run it through a switch - off would be first gear only, on would be normal operation and no need for a diode?

Someone please tell me if I have this all wrong!

Christopher · Jul 25, 2003

It will stay in first just by putting the shift lever in the 1-2 position. It is second that we have no control over w/o the 2'nd gear lockout.

Anyone do the torque converter lock mod?

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