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Bad to downshift in auto?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by MontanaTaco, Oct 9, 2010.

  1. Oct 9, 2010 at 9:40 AM
    #1
    MontanaTaco

    MontanaTaco [OP] Well-Known Member

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    Is it bad to shift down with an auto to help slow down? I know manuals do this all the time I'm wondering if its bad for the auto.
     
  2. Oct 9, 2010 at 9:45 AM
    #2
    jdtemple

    jdtemple Well-Known Member

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    It's cheaper and easier to replace brake pads, than a clutch or transmission.

    With that said, I would do it to control my speed going down hill or when hauling. Using your Auto transmission to slow you down all the time isn't needed, just follow a little further back.
     
  3. Oct 9, 2010 at 9:45 AM
    #3
    jpmorrisvb

    jpmorrisvb Well-Known Member

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    I do it myself from time to time to assist in braking. While in traffic, if there is sudden stopping in front of me I'll do it.

    I am aware that there are certain parameters .... knowing not to go too low at certain speeds.

    To the best of my knowledge the electronics will prevent you from damaging the transmission.
     
  4. Oct 9, 2010 at 9:45 AM
    #4
    scottri

    scottri Well-Known Member

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    I wouldn't do it to slow down, I only do it if my truck starts hunting for gears going up hills.
     
  5. Oct 9, 2010 at 9:47 AM
    #5
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    I would recommend some reading on how a transmission works.

    Generally speaking, use your brakes to slow the vehicle. That's what they're for.

    If you actually engine brake to slow the vehicle, you're just putting unnecessary wear on the transmission. It's better to select and maintain a lower gear only if you're on a sustained downhill grade where overheating your brakes is a realistic possibility. And even then, that prevents you from getting up to a high speed in the first place...it's not a good tool to slow you from highway speeds.
     
  6. Oct 9, 2010 at 11:15 AM
    #6
    TheSchwartz

    TheSchwartz Well-Known Member

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    I do this most everyday on my way home from work being that i have to come down a mountain. i don't really see a problem with this as long as you don't do it to fast and pay attention. i have also done this while hauling a trailer or just because i felt like it at the time. As for the unnecessary wear on the mechanics i don't see that as true the transmission is going to spin weather your in drive or in low. also most newer vehicles will down shift them self when certin parameters are meet.
     
  7. Oct 9, 2010 at 11:26 AM
    #7
    Trap

    Trap Well-Known Member

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    I do it all the time here. The hills are simply to big here and can take your brakes out on a single hill. They just get way to hot.

    Just watch the revs. I would not worry about it. I don't think it will do anything bad. That is why they gave you the shifter in the first place.

    Engine braking is in the manual so you should be just fine.
     
  8. Oct 9, 2010 at 11:35 AM
    #8
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    If you peg the tach high for a long period of time the extra heat generated WILL worsen wear on your mechanicals.

    Again, it's better to not get going too fast to begin with. Using a lower gear helps maintain a safe speed without risk of overheating the brakes by riding 'em the whole way.
     
  9. Oct 9, 2010 at 12:23 PM
    #9
    TheSchwartz

    TheSchwartz Well-Known Member

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    ^^ that is a true statement hense why i said
    "as long as you don't do it to fast and pay attention"
     
  10. Oct 9, 2010 at 12:32 PM
    #10
    ink junky

    ink junky I phucking hate people >:(

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    I keep hearing Samuel L Jackson narrating as I read your post. hahaha :D
     
  11. Oct 9, 2010 at 1:05 PM
    #11
    Airun

    Airun Well-Known Member

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    brake pads are cheap
     
  12. Oct 9, 2010 at 1:11 PM
    #12
    luk8272

    luk8272 Poodoo

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    The manual recommends compression braking (Automatics pg170-172)

    This info found on page 171
    4wd (H2 or H4)& Prerunner Auto:
    3rd gear <86 mph
    2nd gear <59 mph
    Low gear <34 mph
    4wd in L4:
    3rd- 33mph
    2nd- 23mph
    Low- 13mph

    Only caution manual speaks of is over-reving, just keep the tach out of the red.

    Pg 178 "When towing a trailor to maintain engine braking efficiency do not use 5th gear (manual) or 6th gear (auto)."

    As long as it is done properly I see no ill affects as it is recomended so many time in the manual.
     
  13. Oct 9, 2010 at 1:27 PM
    #13
    Trap

    Trap Well-Known Member

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    Problem with that is you don't even get to that point. You end up warping the disks. Then you fix that then you do it again till there too thin then you have all that fun to deal with.

    Like if your in flat land it don't really matter but some hills here are 26 miles long. What you going to do, get the rotors ground down every time you drive down that hill? Although people around here do it cause there clueless. Makes more sence to use the engine to keep the speed down.
     
  14. Oct 9, 2010 at 1:32 PM
    #14
    TheSchwartz

    TheSchwartz Well-Known Member

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    ^ x2
    i did it all the time when i had a manual and i do it in this truck because i can. i dont see it making a difference on the trans or engine aslong as you are paying attention.
     
  15. Oct 9, 2010 at 1:35 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Bingo. Its no different than the tranny up shifting when accelerating hard, as far as load on components is concerned. I down shift all the time when I feel like it. Done this on many vehicles, with no ill affects.
     
  16. Oct 9, 2010 at 1:36 PM
    #16
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    X2.
     
  17. Oct 9, 2010 at 1:40 PM
    #17
    Trap

    Trap Well-Known Member

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    Ya like here brakes simply are not made to be applied for that length of time and you must do something cause the grade is steep enough that you will end up getting going way too fast. People flip there cars and trucks all the time on that hill. Couple of weeks ago there was like three roll overs in a single day on it. You have to pay attention around here. Many semi's have caught of fire on that hill from overheated brakes.
     
  18. Oct 9, 2010 at 1:42 PM
    #18
    TheSchwartz

    TheSchwartz Well-Known Member

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    down shifting = no/limited brake fade!!
     
  19. Oct 9, 2010 at 1:48 PM
    #19
    OZ-T

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

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    I downshift and engine brake on a long hill I travel everyday too , there are no issues with it unless you are redlining the tach .

    You " brake pads are cheaper " guys all live on the prairies or what ?
     
  20. Oct 9, 2010 at 1:53 PM
    #20
    rcbs204

    rcbs204 Well-Known Member Vendor

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    I down shift all the time in my truck, it is especially helpful in the winter. I would not worry about it, my Dad owns Aamco Transmissions, and i asked him and told me that the TCM (Transmission Control Module) will not allow a gear shift at high RPM's down to a really low gear. The he did say it depends on how new the vehicle is too, as the older vehicles did not have TCM and damage can occur.
     
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