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Downshifting our auto trannies

Discussion in '2nd Gen. Tacomas (2005-2015)' started by hardtaco, Jan 28, 2012.

  1. Jan 28, 2012 at 4:17 AM
    #1
    hardtaco

    hardtaco [OP] Well-Known Member

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    Does anyone know if dowshifting our auto transmissions to assist in slowing down, is going to do any harm? I would think it's OK, but not sure. I have an 08 crew cab PreRunner 4.0.........
     
  2. Jan 28, 2012 at 4:20 AM
    #2
    DEEVON911

    DEEVON911 Semi-Pro

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    There has been many a discussion on this, and it should not hurt a thing. Alot of people do it.
     
  3. Jan 28, 2012 at 4:46 AM
    #3
    bethes

    bethes Señorita Member

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    It's never hurt my truck, just make sure you are shifting to a gear appropriate for your speed. Like, don't throw it into L at 55mph. :D
     
  4. Jan 28, 2012 at 5:34 AM
    #4
    hardtaco

    hardtaco [OP] Well-Known Member

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    By looking at the way they designed the plate that the shift knob sits in, it's almost as if they meant for you to be manually shifting gears on the fly. I also do not think the computer would allow for it to be thrown into too low of a gear at too high of a speed.
     
  5. Jan 28, 2012 at 5:37 AM
    #5
    jw1983

    jw1983 Well-Known Member

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    It's good to use for going downhills etc. If you live in hilly terrain it really saves your brakes. If you know what burning brakes smells like after going down a hill, you'd use the downshifts. I do it when I am coming upto a light but I give myself enough space to use it and not use my brakes as often. I found that gear down in other vehicles I've owned that is has made the brakes have a longer life. I make sure that I am doing it under 60 km's an hour. I wouldn't suggest doing 100 km/h and slamming it into "L" or "2". It shouldn't do any damage.
     
  6. Jan 28, 2012 at 5:37 AM
    #6
    memario1214

    memario1214 Vivid Illumination Vendor

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    Yeah, I gots boost
    Though I have never personally tried it on my truck, I am almost certain that there are ECU controls that won't let the transmission just drop into 1st gear at 65 for example... That would grenade your tranny in a hurry.
     
  7. Jan 28, 2012 at 6:10 AM
    #7
    bethes

    bethes Señorita Member

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    I don't know if the computer would let you shift too far down or not, but I'm not willing to try it and find out, either. If you're close to redlining you're in the wrong gear. Hit your brakes firmly, slow quickly to a good speed. Riding the brakes down a hill is what burns them out.
     
  8. Jan 28, 2012 at 8:17 AM
    #8
    AlaskanTaco

    AlaskanTaco Well-Known Member

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    ANY vehicle will not shift into a lower gear for the appropriate speed. The transmission control module will not turn on the solenoid until the proper speed is appropriate. You are just using a Set of over running clutches when you use this. It will do NO harm to you transmission at all. The only time I have ever seen a transmission take a dump because of the user using this feature, was because he was also towing a 28 foot boat in behind him through the mountains of Alaska. This is why the invited TRAILER BREAKS for. I took the transmission out, replaced those 4 clutches and steels, reconditioned the 3-4 and reverse clutch pack. And they where on there way. Was not that bad of a thing to do
     
  9. Jan 28, 2012 at 8:19 AM
    #9
    Who Dat Popcorn

    Who Dat Popcorn Dafuq

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    Yup, I do it all the time.

    Makes me look like a ricer :cool:
     
  10. Jan 28, 2012 at 8:20 AM
    #10
    jw1983

    jw1983 Well-Known Member

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    Lol^^hes a ricer
     
  11. Jan 28, 2012 at 8:23 AM
    #11
    Maticuno

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    When coming to a stop sign from 55+ I shift from D - 4 - 3 all the time. The computer controlled transmission will not allow you to downshift in a manner that will harm the truck. Your face is a different story: be careful if you shift into L while on the move. The truck will try to pitch you through the windshield.
     
  12. Jan 28, 2012 at 8:40 AM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FWIW, THe computer will NOT let you go into too low of a gear You can move teh shifter into one, "L" for example, but it wont actually shift until you are at a safe enough speed. ALso, if it DID allow you to shift into a gear at any speed, the tranny would be fine, but the engine would over speed.
     
  13. Jan 28, 2012 at 8:47 AM
    #13
    186000mps

    186000mps ..Slingin' up mud and we're scarying off bunnies..

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    In our Auto 4Runner coming down the mountain passes around here, especially around Killington, I drop to 3 at the crest of the hills, it keeps me right around 55 the whole way down without using the brakes. I see lots of cars ahead of me with their brakes on most of the way, I am glad to be saving my brakes for when I really need them.
     
  14. Jan 28, 2012 at 2:54 PM
    #14
    BostonBilly

    BostonBilly Well-Known Member

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    What about coasting down a hill in N for better mileage is that harmful
     
  15. Jan 28, 2012 at 4:21 PM
    #15
    Maticuno

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    It's actually better to descend a hill in gear. With the transmission turning the engine on a downhill run, the computer will shut down the injectors and you will be rolling along using ZERO fuel, instead of using enough fuel to keep the engine idling if you were coasting in neutral.
     
  16. Jan 28, 2012 at 4:26 PM
    #16
    dayNnite4

    dayNnite4 We can't stop here, this is bat country.

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    interesting.. how does the engine continue firing without any fuel going thru the injectors tho?
     
  17. Jan 28, 2012 at 4:38 PM
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    JKD

    JKD Well-Known Member

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    Since the computer already downshifts while coming to a stop anyway, you won't do any further harm doing it manually.
     
  18. Jan 28, 2012 at 4:50 PM
    #18
    Sheppymach

    Sheppymach Well-Known Member

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    I have been doing it since the truck was new and in my 04 Audi A4 and never had a problem. the Audi actually loves being shifted manually
     
  19. Jan 28, 2012 at 4:53 PM
    #19
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    It's fine

    Deja vu this thread
     
  20. Jan 28, 2012 at 5:04 PM
    #20
    Maticuno

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    Is it safe to downshift while ATRAC is active? :D
     
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