4lo and ECT

[FrogginAround]

Does the ECT change the shift points in 4hi and 4lo as well or does it get overridden by the 4wd gearing?

 

[Tinigunner11]

Does the ECT change the shift points in 4hi and 4lo as well or does it get overridden by the 4wd gearing?

Ect will work completely normal in 4hi. In 4lo there is no real way for it to “work” 4lo is geared so low that you really can’t get out of second gear. First gear is fairly short in these trucks also so the Ecu will shift to second before ect has a real chance to work.

If you don’t mind me asking what spurred the question?

 

[Dieselchessy]

I don’t specifically remember 4 Lo, but in my 99 Auto the ECT button raised the shift points about 200 rpm. That’s it, nothing exciting.
Would be no use in 4 Lo.

 

[jgue467]

Avoid the 1-2 harsh shift in 4Lo...

Does the ECT change the shift points in 4hi and 4lo as well or does it get overridden by the 4wd gearing?

Not sure about '99s but those horrible 01-02s have the ability to start 4Lo in 2nd gear by simply putting the shifter into 2nd.

That avoids the harsh 1-2 shift that most 4Lo users encounter at about 8-9mph.

Now that's a Useful Feature!

 

[FrogginAround]

Ect will work completely normal in 4hi. In 4lo there is no real way for it to “work” 4lo is geared so low that you really can’t get out of second gear. First gear is fairly short in these trucks also so the Ecu will shift to second before ect has a real chance to work.

If you don’t mind me asking what spurred the question?

I was just out on some forest trails this weekend and thought about how each of them changes the shift points. Then I started wondering if they could work together or if one cancels the other.

 

[FrogginAround]

Not sure about '99s but those horrible 01-02s have the ability to start 4Lo in 2nd gear by simply putting the shifter into 2nd.

That avoids the harsh 1-2 shift that most 4Lo users encounter at about 8-9mph.

Now that's a Useful Feature!

I have a 96 and that definitely have that 1-2 lurch.

 

[3bears]

I do most of my driving with the ECT on. My 2000 had that 1-2 bump when in 4lo

HOWEVER ...now that I have my locker...I use 4low a lot less

 

[camryn.samples]

I do most of my driving with the ECT on. My 2000 had that 1-2 bump when in 4lo

HOWEVER ...now that I have my locker...I use 4low a lot less

How does that affect your mpg because I heard ECT impacts that a bit.


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[3bears]

How does that affect your mpg because I heard ECT impacts that a bit.


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most of my driving is on gravel roads and hills/mountains so having the higher shift points is nice.
If and when I do hiway driving....more than 10minutes or so then ECT off would actually give you better MPG as it will kick into overdrive sooner

 

[FrogginAround]

I don’t specifically remember 4 Lo, but in my 99 Auto the ECT button raised the shift points about 200 rpm. That’s it, nothing exciting.
Would be no use in 4 Lo.

Ya that's kind of what i figured. Thanks.

 

[camryn.samples]

most of my driving is on gravel roads and hills/mountains so having the higher shift points is nice.
If and when I do hiway driving....more than 10minutes or so then ECT off would actually give you better MPG as it will kick into overdrive sooner

Good to know.


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[St Runner]

The ECT button also works on a 5 speed!

 

[FrogginAround]

most of my driving is on gravel roads and hills/mountains so having the higher shift points is nice.
If and when I do hiway driving....more than 10minutes or so then ECT off would actually give you better MPG as it will kick into overdrive sooner

This!