TCC lockup

[matuva]

close 1 AM sunday here, I searched a bit, but might get too tired and didn't find the reply :

I'm looking for the wiring mod on a 4L80E which will allow to lock the torque converter in either 2nd, 3rd or even OD.

This is to mod a K1500 used to work on our nickel mines. The owner (a lady) goes from top of the mine to the lower level in OD, stepping brakes at any times while going down hill
We're going to rebuild her brakes soon.

I told her to go down in 2nd or 3rd to help a bit, and I think the TCC lockup mod should help a lot to save brakes, and sure be safer for her.

Any of you have done that ?

gees, going to bed. See ya later guys ( and girls )

 

[buddy]

need to know the year of the truck.

She really needs to be downshifting as you say, that will do the most.

 

[Matt Bachand]

Always 4-Low option.... Depending how steep........

 

[dracor85]

I just did this mod to my truck two days ago and from what I read it is doable on a 96 and older (yes I know the 96 is a OBDll, the reasearch I'v found says its ok on a 96).

Their is two ways to do it one is in the cab and the other is at the transmission depends on your preferance.

If your doing it at the transmission you need to locate the wireing harness on the drivers side of the transmission it should be the rearmost harness on the trans.

That harness has a funny cover that turns the wireing sideways towards the back of the truck, you have to squeze the boot and the whole plug should come right out.

Find the "BROWN" wire and you need to splice it to a 3way switch (single pole double throw) when you wire up the switch you have two inputs and one output the single output is going to be wired to the transmission side of the brown wire.

The two inputs one is going to be wired to the "computer" side of the brown wire, this will allow your PCM and TCM to talk and make your TCC lock normally. The other side of the switch gets wired to a good ground which will make your TCC lock manually.

Hope this helps, let me know if you have any other questions on it.

 

[NVW]

http://blog.heathdiesel.com/2005/11/...converter.html

 

[Steve93mustanglx]

http://blog.heathdiesel.com/2005_11_01_heathdiesel_archive.html

Couldn't get NVW's link to work- found post, trying it again

 

[mamzerook]

http://www.dieselplace.com/forum/showthread.php?t=177851

One of the best write ups I have seen.

Thanks to fonecop
IIRC it only works on OBDI?

 

[matuva]

Thanks for all the inputs guys.
The truck is a 1997, OBD2.

Dracor, do you know if that works on OBD2 trucks ?

 

[ak diesel driver]

I believe Edzzed sp? has it on an obd2 works but will throw codes if you get out of range. I believe he said under 45 mph and it would code.

 

[NVW]

http://blog.heathdiesel.com/2005_11_01_heathdiesel_archive.html

Couldn't get NVW's link to work- found post, trying it again

I did a search and copied a link to heath's blog. It works on the searched link but not on mine. They are identical. Anyway it was to your link to Heath's blog.

 

[Turbine Doc]

The PWM TCC lockup used in OBD-II does not lend itself to being able to use the toggle switch override that works the OBD-I trans controls, supposedly there is a lockup module for sale, but I have also heard it had mixed results

 

[mamzerook]

The PWM TCC lockup used in OBD-II does not lend itself to being able to use the toggle switch override that works the OBD-I trans controls, supposedly there is a lockup module for sale, but I have also heard it had mixed results

BD Torque-Loc I believe it was Tim?

 

[matuva]

This one ? : http://www.thoroughbreddiesel.com/bd-diesel/torqloc.htm

Should an exhaust brake to be considered as a good solution for the problem I mentioned in post # 1 ?

 

[WarWagon]

This one ? : http://www.thoroughbreddiesel.com/bd-diesel/torqloc.htm

Should an exhaust brake to be considered as a good solution for the problem I mentioned in post # 1 ?

Not for someone who doesn't down shift to start with.

:mad2: Good luck teaching her to do that.

A rear disc brake option/mod and frequent service would be a better investment.

 

[buddy]

Good luck teaching that to most of the population, I cant stand how much people ride thier brakes down long steep hills/mts

 

[WarWagon]

Good luck teaching that to most of the population, I cant stand how much people ride thier brakes down long steep hills/mts

And GM is taking note. No more orange and red lines on the tach. Good luck downshifting and having 'new' gas engines throttle down - They don't as well as they used too.