Tow/haul mode

[Motrhedx81]

Where did you get your tow/haul button?

 

[Supercharged111]

Universal Trigger Module - PAC

Simplify your install

catalog.pac-audio.com

This is what you want. It’s way easier than a latching relay circuit and takes up way less room. This is what I ended up doing on mine and it works perfect. Push the button light comes on, push it again OR turn the key off, it it goes off amd stays off when key back on.

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*edit** I guess wiring info would help lol. On the TR-7 Brown ties into the trigger wire from switch to the ecu. Blue is +out to the light. And of course red 12v+ and black ground (also ground out light) that's it, just 4 wires. Easy??

Do I spy Dakota gauges? With c0mmi3 units?

 

[Cadillacmak]

Universal Trigger Module - PAC

Simplify your install

catalog.pac-audio.com

This is what you want. It’s way easier than a latching relay circuit and takes up way less room. This is what I ended up doing on mine and it works perfect. Push the button light comes on, push it again OR turn the key off, it it goes off amd stays off when key back on.


*edit** I guess wiring info would help lol. On the TR-7 Brown ties into the trigger wire from switch to the ecu. Blue is +out to the light. And of course red 12v+ and black ground (also ground out light) that's it, just 4 wires. Easy??

You are the MAN! What gauge set is that?

 

[TonyM]

Where did you get your tow/haul button?

It came out of an early 2000's S series Blazer or Jimmy. The S trucks had them too

Do I spy Dakota gauges? With c0mmi3 units?

You mean Metric? Lol

You are the MAN! What gauge set is that?

It's a Dakota Digital VHX

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[L31MaxExpress]

Where did you get your tow/haul button?

03-07 Express/Savanna vans have the same button.

My 97 van has the shifter for a 2000-2005 Astro. It fits the trucks too and has the button like a GMT800 does on the end of the shifter. My 99 Tahoe also has the Astro/Safari shifter handle.

 

[L31MaxExpress]

I have actually been meaning to look for a 99-2000 GMT800 4.3L V6 or 2000 Astro/Safari PCM wiring diagram for some time now. Both had factory Tow/Haul and both were still Black Box PCMs. The Astro did not have a BCM either so it was an analog request signal and Tow/Haul light as well. The Performance mode shift tables are there in the Black Box labeled as Economy but the input that triggers them has never been posted. The GMT800/Astro black box diagram should show where it is hiding.

Similarly I need to find a diagram for the Kodiak trucks with an 8100 with a 0411 or P59 to find the analog Oil Life change oil light output.

 

[Schurkey]

I'm so old, I grew up with Powerglides, and TH400s.

The whole concept of having to tow in "D" rather than "OD" strikes me as inherently wrong. And then they moved to having to push a "Tow/Haul" button.

These things are supposed to be AUTOMATIC transmissions. They're supposed to adapt to changes in driving conditions AUTOMATICALLY. If the operator has to move levers and push buttons depending on how the vehicle is being used, they should be advertised as SEMI-AUTOMATIC transmissions.

Old guy done ranting. Moving on to shaking my fist at the clouds.

 

[L31MaxExpress]

I'm so old, I grew up with Powerglides, and TH400s.

The whole concept of having to tow in "D" rather than "OD" strikes me as inherently wrong. And then they moved to having to push a "Tow/Haul" button.

These things are supposed to be AUTOMATIC transmissions. They're supposed to adapt to changes in driving conditions AUTOMATICALLY. If the operator has to move levers and push buttons depending on how the vehicle is being used, they should be advertised as SEMI-AUTOMATIC transmissions.

Old guy done ranting. Moving on to shaking my fist at the clouds.

Problem with the later automatics is not so much the hardware as it is the programming. GM calibrated them, even the 700r4 to maximize fuel economy. They shift too early under load and thus prone to shuffling especially between 3rd and 4th. If the 3-4 upshift was more delayed the tendency to hunt between gears would dissapear because under a load towing it would never upshift to 4th in the first place unless you were headed down hill or possibly on a long, level flat section of road. Above about 15 mph the 4L60E and 4L80E were calibrated not to kickdown to 1st again unless you basically gave it WOT. Not good when you make a turn starting off at slow speed and try to get rolling uphill towing a trailer especially in the rain.

 

[Supercharged111]

Problem with the later automatics is not so much the hardware as it is the programming. GM calibrated them, even the 700r4 to maximize fuel economy. They shift too early under load and thus prone to shuffling especially between 3rd and 4th. If the 3-4 upshift was more delayed the tendency to hunt between gears would dissapear because under a load towing it would never upshift to 4th in the first place unless you were headed down hill or possibly on a long, level flat section of road. Above about 15 mph the 4L60E and 4L80E were calibrated not to kickdown to 1st again unless you basically gave it WOT. Not good when you make a turn starting off at slow speed and try to get rolling uphill towing a trailer especially in the rain.

Let's not overlook the 4L60's propensity to kill itself even faster if overladen (for 4L60 stuff) in OD.

 

[Caman96]

I think OD stands for Over-Dose in a 4l60.