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No Reverse

Discussion in '2nd Gen. Tacomas' started by TheHansen, Nov 9, 2013.

  1. Nov 9, 2013 at 12:43 PM
    #1
    TheHansen

    TheHansen [OP] Well-Known Member

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    So I was driving my truck around on some dirt roads. Nothing to extreme. Now when I put the truck in reverse nothing happens. The engine revs as if it were in neutral. Should I start looking for a new transmission?

    In any forward gear the truck moves no problem.
     
  2. Nov 9, 2013 at 12:57 PM
    #2
    bldegle2

    bldegle2 OldPhart

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    automatic, you got a problem, maybe the linkage got disturbed offroading...otherwise, your tranny may have gone fubar..
     
  3. Nov 9, 2013 at 1:31 PM
    #3
    gearcruncher

    gearcruncher Well-Known Member

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    Have seen issues with the transfer case causing no reverse .
    What happens when you select 4X4 and 4Lo ?

    Did you get the truck stuck ? and does the truck still have low gear ?
    the same clutch pack used for reverse is also used for forward -Low gear .
    The truck starts in park but will it start in neutral ? this may rule out a linkage issue .
    The transmission uses very high pressure to get reverse . Are you sure its topped up with trans fluid ?
     
  4. Nov 9, 2013 at 1:57 PM
    #4
    acdronin

    acdronin Well-Known Member

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    .
    ^^^Sounds like good tranny advice from a guy who's username is 'Gearcruncher' lol
     
  5. Nov 9, 2013 at 3:54 PM
    #5
    TheHansen

    TheHansen [OP] Well-Known Member

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    Update. All that works is first gear. If I put the truck in "D" it will only use first gear. Only when I put the truck to "2" will it seem to upshift, but it just seems like it shifts to neutral.
     
  6. Nov 10, 2013 at 3:42 AM
    #6
    bldegle2

    bldegle2 OldPhart

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    have you checked the fluids, climbed under to give a visual inspection, how is the fluid level?

    Maybe a transmission shop can render an opinion at this point...
     
  7. Nov 10, 2013 at 6:29 AM
    #7
    TheHansen

    TheHansen [OP] Well-Known Member

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    Checked fluids, looks bright red, doesn't smell burnt. I looked through the FSM I found online but I can't find anything that would cause a symptom of no reverse.
     
  8. Nov 10, 2013 at 12:42 PM
    #8
    gearcruncher

    gearcruncher Well-Known Member

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    Reverse inside the A750E is strictly mechanical . This means there are no solenoids or computer controls used for the transmission to select reverse .
    When you select reverse , the linkage moves the manual valve inside the valve body of the transmission and hydraulic pressure applies the clutching to get reverse . No ECM controls , no solenoids are used
    Did you get the truck stuck ?
    Have you tried the transfer case in 4X4 and 4 low ?
    Will the truck start in park and neutral ?

    I am going with broken planetaries if the above is tested and all works fine .The same planetaries used for reverse are also used for upshifting in the forward gear ranges . Portions of the valve body could be jammed up but usually there is a cause for the spool valves getting stuck .
    If the ECM commands the transmission to upshift to 3rd gear but for some reason or another , it doesnt upshift , the ECM will put the transmission into fail safe to prevent further damage but even if the transmission was in fail safe , you would still get reverse .
    Sounds like you are now in fail safe mode .
     
    Last edited: Nov 15, 2013
  9. Nov 10, 2013 at 3:00 PM
    #9
    maineah

    maineah Well-Known Member

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    Doesn't that trans also apply direct clutch pack in reverse? Never had one apart but doesn't it also have a sprage on the low clutch drum? It sounds like he broke some thing not a normal worn part type of thing.
     
  10. Nov 10, 2013 at 3:33 PM
    #10
    gearcruncher

    gearcruncher Well-Known Member

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    Havnt looked at the actual powerflow , but I beleive you are correct
     
  11. Nov 11, 2013 at 10:14 AM
    #11
    TheHansen

    TheHansen [OP] Well-Known Member

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    So I dropped the truck off at a transmission shop this morning. I'll update as soon as i hear back as to what failed.

    I wish it broke in the summer so I could have time to swap the transmission myself, I just don't have the time during the school year. (MNE Senior)
     
  12. Nov 11, 2013 at 12:53 PM
    #12
    TheHansen

    TheHansen [OP] Well-Known Member

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    Just got a call from the shop. The truck will only shift into first and fourth. Hopefully it is a solenoid issue. But if reverse is strictly mechanical i guess there is more wrong. Next call will hopefully be in the afternoon tomorrow.
     
  13. Nov 11, 2013 at 4:28 PM
    #13
    maineah

    maineah Well-Known Member

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    No it not mechanical but it has no management to it (computer control) It still has to apply clutch packs with trans fluid.
     
  14. Nov 14, 2013 at 2:19 PM
    #14
    TheHansen

    TheHansen [OP] Well-Known Member

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    Just to have the problem listed in this page, I broke a planetary ring gear so i am getting it rebuilt.
     
  15. Nov 15, 2013 at 5:11 AM
    #15
    gearcruncher

    gearcruncher Well-Known Member

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    Could you take a picture of the broken part ?
    Did they say why it broke ?
     
  16. Nov 15, 2013 at 11:31 AM
    #16
    TheHansen

    TheHansen [OP] Well-Known Member

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    They asked me if i jammed it into gear while the truck was rolling. i.e. rolling back and putting it into drive or rolling forward and putting it into reverse.

    I swear i didn't do anything like that. It just stopped working, no bang, no grinding, nothing. I even continued driving long enough to get out of the trails to get towed, and there wasn't any grinding sounds. At the time i was convinced it was an electrical problem because i had been through some puddles.

    I asked them to keep the broken parts. When i get it back next week I will get more specifics on which part failed, and ill post pictures.
     
  17. Nov 15, 2013 at 1:25 PM
    #17
    gearcruncher

    gearcruncher Well-Known Member

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    I have seen the ring gear break off the lower planetary carrier many times in the past but not on the A750E . The ring gear is welded on the planetary in multiple locations and the welds break . If this is what happened , its not something you did . Poor welding , poor machining , incorrectly baked when the transmission was being built or 99 % of the time , this is caused by not coming to a complete stop before moving the manual linkage to forward . Selecting reverse under high engine rpm would also break the planetary
    Have you owned the truck since new ? could be something that happened previous to you owning therefore it was a matter of time .
    This is a rare occurance and not a pattern failure for the A750E.
    Be happy we dont own a Ford or Chevy . Broken planetaries and busted gearing are very very common on their automatics to the point that they are designed to fail .
     
    Last edited: Nov 15, 2013
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