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Unread 08-11-2005, 11:18 AM   #1
bulldog
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Talking 4Lo and 1st geat down hill (V8 4Runner)

I noticed this weekend again on my V8 4Runner with the 5spd auto box, that if you are in 4Lo and put it in 1st gear it locks the torque converter when going downhill.

So it basically works exactly the same as a stick shift for engine braking on steep slow hill descents. No need for braking or using DAC on most steep hills.

I tried again on Garcia Ridge and it worked like a chram.

I think the 4spd might do the same, but with less dramatic effect as the gearing is slightly higher and the engine slightly smaller.

Just thought I would share.
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Unread 09-23-2005, 11:02 PM   #2
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I never knew about the locked torque converter (wouldn't know how to tell). But I've done it on some steep descents with 1st gear, 4Lo, and DHA enabled.

It actually works pretty nice together.
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Unread 09-24-2005, 01:37 PM   #3
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It works pretty well even without DAC. I found DAC to be too slow in some situations. Just having it locked in first gear works fine for most hills.
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Unread 05-22-2006, 02:54 PM   #4
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Question question

Do you think using this technique with the center diff locked puts a lot unneeded stress on the center differential?


I used 4lo 1st a bunch on Saturday, it worked great, I barely needed to use the brakes but about 2/3 the way down I realized the center diff was still locked......is that a stupid thing to do? Should I have unlocked the center diff before I started the decent? Does it work better with the center diff locked?
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Unread 05-22-2006, 03:23 PM   #5
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I normally have my center diff locked for steep climbs and decends unless the surface has very good traction. So I would say as a general rule keep it locked fro climbs and decends, it wont put any real strain on the transfer case unless the surace has good grip (like pavement) and you are making turns.

Remember most 4x4 are part time and don't even have a center diff and are always locked when using 4WD.
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Unread 08-23-2006, 03:38 PM   #6
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Default Push start / Roll-start

Just curious, but based on the torque converter lockup you describe in 4Lo and 1, would it be possible to push or roll-start a 4R? Assuming of course that you have enough juice left to actuate 4Lo in the transfer case and can quickly shift from N to 1. Or does the tranny still require hydraulic pressure from the input shaft?
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Unread 08-23-2006, 03:47 PM   #7
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Hypothetically you can pop-start any automatic, but I believe they need to be going like 35mph for it to work.
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Unread 08-23-2006, 04:29 PM   #8
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Quote:
Originally Posted by Jeffreal
Just curious, but based on the torque converter lockup you describe in 4Lo and 1, would it be possible to push or roll-start a 4R? Assuming of course that you have enough juice left to actuate 4Lo in the transfer case and can quickly shift from N to 1. Or does the tranny still require hydraulic pressure from the input shaft?
Not sure on this as the engine was running when doing it, so the TQ converter had pressure. I don't think it will work to push start the engine.
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Unread 03-22-2007, 11:33 AM   #9
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Smile So true.

Quote:
Originally Posted by bulldog View Post
I normally have my center diff locked for steep climbs and decends unless the surface has very good traction. So I would say as a general rule keep it locked fro climbs and decends, it wont put any real strain on the transfer case unless the surace has good grip (like pavement) and you are making turns.

Remember most 4x4 are part time and don't even have a center diff and are always locked when using 4WD.
I am glad someone pointed this out .
I was all giddy because I bought a 2006 TR4 with a "locker".
After research, I found out what the whole AWD/4WD thing and I was a little disgruntled. Yeah, its nice and all, but a rear locker straight outta an FJ would be nice since (according to dealership), the axles are indentical.
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Unread 03-22-2007, 12:17 PM   #10
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Quote:
Originally Posted by JeepResQ View Post
Yeah, its nice and all, but a rear locker straight outta an FJ would be nice since (according to dealership), the axles are indentical.
The way I see it is it's just an excuse for us to add a beefier locker and make other improvements to the rear end at the same time.
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Unread 03-23-2007, 04:04 AM   #11
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Cool So very true!

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Originally Posted by Mikestang View Post
The way I see it is it's just an excuse for us to add a beefier locker and make other improvements to the rear end at the same time.


I have thought about that for a while. Be kinda kool to see a TR4 with rear steer!
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Unread 05-30-2007, 06:38 PM   #12
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Default I must admit

After really throttling ATRAC, I like it!!!
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Unread 11-06-2010, 12:21 PM   #13
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Oh boy, resurecting the dead here. I suck at searching so asking here...

Is there a way to use the DAC without being in 4LO? Has anyone come up with a way to override?

Thanks and I love OLDIES!
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Unread 11-08-2010, 08:35 AM   #14
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The short answer is , No. DAC works only in 4LO. Here is a good read about it below. I have not really had a chance to use my DAC that much but, the couple times that i have used it, nice and slow and low...
By the way using 4Lo and 1st going down steep hills or grades works great! Agreed about locking the center diff in lose or slippery conditions ....Mine is a V6

http://pressroom.toyota.com/pr/tms/t...9HAC_DAC_r.pdf
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Unread 12-08-2011, 11:31 PM   #15
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That's cool... 4WD engine braking is so superior to the brakes for slowing down on slipper surfaces it's ridiculous... glad the T4R V8 5spd is particularly good in this area!!!
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Unread 12-09-2011, 09:13 AM   #16
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Quote:
Originally Posted by Bahnstoermer View Post
That's cool... 4WD engine braking is so superior to the brakes for slowing down on slipper surfaces it's ridiculous... glad the T4R V8 5spd is particularly good in this area!!!
2005 and up V6 also have the 5 speed
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