07-16-2006, 12:47 PM
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#1
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Does downhill assist really do this?
I found this over on the RV.net forum. I had never heard of this - is it true?
Quote:
The 4Runner on the other hand comes with a 5 speed automatic with Downhill Assist control that when engaged acts like the tow/haul mode on the Allison transmission on GM HD trucks. It will downshift a gear everytime you brake to allow grade braking so you don't fry the brakes. And you can also shift the lever to any gear you want, there's D, 4, 3, 2, L which helps a ton when coming down steep grades with and without the trailer.
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2003 V8 4x4 Sport 4Runner TRUCK OF THE MONTH SEPT. 06 - still tows a 25' ultralite Rockwood 2502 travel trailer all over creation!
MODS: GlowShift tranny temp gauge; Hayden 526 tranny cooler/fan combo; Hopkins Insight brake controller; Bilstein 5100 shocks
Hensley Arrow hitching system - quite simply the best for zero sway towing!
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07-16-2006, 12:49 PM
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#2
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Not exactly.
I played with mine a few times, and it seems to basically crawl down a slope. You might be able to manually select the gear though..... I don't really remember.
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07-16-2006, 01:15 PM
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#3
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I've used it while offroading, but the quote sounded like you could use it as an engine brake while traveling highway speeds.
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2003 V8 4x4 Sport 4Runner TRUCK OF THE MONTH SEPT. 06 - still tows a 25' ultralite Rockwood 2502 travel trailer all over creation!
MODS: GlowShift tranny temp gauge; Hayden 526 tranny cooler/fan combo; Hopkins Insight brake controller; Bilstein 5100 shocks
Hensley Arrow hitching system - quite simply the best for zero sway towing!
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07-16-2006, 03:07 PM
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#4
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doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
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2004 Sport ed. 4.slow V-6, Sliver on black. 48,000 and counting
2000 Tacoma 4cyl 5 speed, ex cab. 200,000 and counting
1994 pickup 4cyl auto 150,000 sold but not forgoten
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07-16-2006, 03:13 PM
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#5
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Quote:
Originally posted by mainer
doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
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Why doesn't it work? You just have to enable it under the right circumstances.
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07-16-2006, 03:14 PM
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#6
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Re: Does downhill assist really do this?
Quote:
Originally posted by TeryT
I found this over on the RV.net forum. I had never heard of this - is it true?
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He's just using the wrong term. DAC works only in low range. He must be referring to the shift into 4th from 5th when touching the brake downhill in high range.
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2005 Limited V8
Bilstein 5100 at .85
5th gen SR5 springs
BFG AT KO2 LT265/70/17 Load C (Replaced Revo 2 LT265/70/17 Load E)
Hanna sliders
Last edited by JB.; 07-17-2006 at 02:20 AM.
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07-16-2006, 03:19 PM
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#7
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Quote:
Originally posted by mainer
doesn't the book say that it only works in low range under 15mph. I've yet to get mine to work.
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Low range, foot off the pedals, 15mph or less...it should work.
It'll temporarily disengage under pedal use and then come on again
when you take your foot off.
__________________
2005 Limited V8
Bilstein 5100 at .85
5th gen SR5 springs
BFG AT KO2 LT265/70/17 Load C (Replaced Revo 2 LT265/70/17 Load E)
Hanna sliders
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07-16-2006, 03:30 PM
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#8
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Quote:
Originally posted by Fourty-four
Why doesn't it work? You just have to enable it under the right circumstances.
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That must be it! I thought I was missing something when towing, going downhill & manually downshifting.
Didn't want to be caught doing the "old school" way if there was a new one!
As said, I have used the downhill assist offroading (in 4-low), and it works well - you just have to get used to it doing the job (and the noise it makes).
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2003 V8 4x4 Sport 4Runner TRUCK OF THE MONTH SEPT. 06 - still tows a 25' ultralite Rockwood 2502 travel trailer all over creation!
MODS: GlowShift tranny temp gauge; Hayden 526 tranny cooler/fan combo; Hopkins Insight brake controller; Bilstein 5100 shocks
Hensley Arrow hitching system - quite simply the best for zero sway towing!
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07-16-2006, 03:36 PM
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#9
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I tried it on a long down hill covered in snow. I was under 15 and had my foot off brake and gas. low range and hit the button, it did nothing. I'll have to try it again.
Doesn't the trany down shift when you apply the brake?
and is the trany in the sport a 4 or a 5 speed.
Thanks Cooper
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2004 Sport ed. 4.slow V-6, Sliver on black. 48,000 and counting
2000 Tacoma 4cyl 5 speed, ex cab. 200,000 and counting
1994 pickup 4cyl auto 150,000 sold but not forgoten
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07-16-2006, 05:26 PM
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#10
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Re: Re: Does downhill assist really do this?
The 4Runner does not have anything like tow/haul mode.
They need to read up on Downhill Assist.
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07-16-2006, 06:53 PM
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#11
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Somebody else said: "This is what the Tundra has (not restricted to 4-low)- I'd assumed they'd just passed it over to the 4-runner. There is no engaging or disengaging it however. Simply, when you are on a downgrade with the brakes applied, the Tundra will down shift. "
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2003 V8 4x4 Sport 4Runner TRUCK OF THE MONTH SEPT. 06 - still tows a 25' ultralite Rockwood 2502 travel trailer all over creation!
MODS: GlowShift tranny temp gauge; Hayden 526 tranny cooler/fan combo; Hopkins Insight brake controller; Bilstein 5100 shocks
Hensley Arrow hitching system - quite simply the best for zero sway towing!
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07-16-2006, 06:57 PM
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#12
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The person that made the post over on RV.net replied and said:
Quote:
It works in 4hi for me, I just tried it today. I was coming down a steep grade and turned on DAC, tapped the brakes and the tranny downshifted a gear and increased RPM's which slowed down the truck. I don't know if that is a feature in the 05 and up models or if its in all of them. In 4Lo the DAC uses the ABS system to keep the 4Runner pointed in the direction you want down a steep hill under 15mph. The DAC works very well when towing.
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2003 V8 4x4 Sport 4Runner TRUCK OF THE MONTH SEPT. 06 - still tows a 25' ultralite Rockwood 2502 travel trailer all over creation!
MODS: GlowShift tranny temp gauge; Hayden 526 tranny cooler/fan combo; Hopkins Insight brake controller; Bilstein 5100 shocks
Hensley Arrow hitching system - quite simply the best for zero sway towing!
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07-16-2006, 07:09 PM
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#13
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Quote:
Originally posted by mainer
I tried it on a long down hill covered in snow. I was under 15 and had my foot off brake and gas. low range and hit the button, it did nothing. I'll have to try it again.
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Make sure you don't have your foot on either the brake or the gas when you acivate DAC. Reading through the manual it sounds like pressing either one will deactivate the system.
I've used mine a couple of times and have to say it's kind of creepy at first, plus it makes a bunch of noise as it activates and releases the brakes. Sounds like something must be getting ready to come loose under the truck.
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07-16-2006, 07:27 PM
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#14
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Quote:
Originally posted by TeryT
The person that made the post over on RV.net replied and said:
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It works in 4hi for me...turned on DAC...tapped the brakes and the tranny downshifted a gear
That would have happened whether he pushed the DAC button or not.
__________________
2005 Limited V8
Bilstein 5100 at .85
5th gen SR5 springs
BFG AT KO2 LT265/70/17 Load C (Replaced Revo 2 LT265/70/17 Load E)
Hanna sliders
Last edited by JB.; 07-16-2006 at 07:33 PM.
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07-17-2006, 01:40 AM
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#15
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Quote:
Originally posted by JB.
It works in 4hi for me...turned on DAC...tapped the brakes and the tranny downshifted a gear
That would have happened whether he pushed the DAC button or not.
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Exactly.....totally seperate features.
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