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Transmission won't shift when the trucks running but will when its not..wtf?

Discussion in '79-95 Toyota Truck Tech' started by fjman, Jul 10, 2009.

  1. fjman

    fjman

    Messages:
    1,110
    Location:
    DC
    So why would a 1995 4runner with a 5 spd suddenly have shifting problems? Never had clutch slippage or any transmission issues. Basically, it'll row through the gears with or without pressing in the clutch if the truck is NOT running. If it is running, you need to start it in gear and plan on leaving it there! Can't shift if the engines running, including reverse...

    So anyone have an idea what the issue is?
  2. raydouble

    raydouble

    Messages:
    1,707
    Location:
    Rochester, WA
    Sounds like your clutch isn't releasing from the engine, do you have any brake fluid in your clutch MC?
  3. fjman

    fjman

    Messages:
    1,110
    Location:
    DC
    Yeah, the master cylinder is full....
  4. raydouble

    raydouble

    Messages:
    1,707
    Location:
    Rochester, WA
    I'd say that air entered the clutch hydraulic system or the MC/slave are toast.

    No resistance to shifting gears when the engine is off.
  5. raydouble

    raydouble

    Messages:
    1,707
    Location:
    Rochester, WA
  6. KLF

    KLF Frame waxer SILVER Star

    Messages:
    5,337
    Location:
    Southern NH
    Just because the clutch isn't slipping, it doesn't mean it's not worn out.

    Check the release hydraulics out carefully. If everything is working properly and there's no leaks, start collecting parts for a clutch job.
  7. fjman

    fjman

    Messages:
    1,110
    Location:
    DC
    If it was the MC/slave cylinder, wouldn't i need to pump the clutch just to get resistance? If I start it in 2nd gear for instance, I can drive it around in second gear as normal, just can't shift out of second.... Even stop and go, clutch seems to work
  8. Jukelemon

    Jukelemon

    Messages:
    2,393
    Location:
    Louisville, KY
    I agree with the clutch.

    I dont see how you can say the clutch works. What gives you the idea that it is engaging/disengaging if it not doing its main function when running?

    Sounds like the clutch is constantly disengaged i.e. would explain why you can shift when it is not running but it will not shift out when running.
  9. Tools R Us

    Tools R Us Moderator SILVER Star

    Messages:
    17,422
    Location:
    Chandler, AZ
    Sounds like the clutch pilot bearing is seized?
  10. corax

    corax

    Messages:
    297
    Location:
    Eugene, OR
    clutch pilot bearing or clutch disc . . . I had the same exact thing happen about 8 years ago in my '88 p/u, found out the clutch disc springs broke and wedged between the flywheel and disc (keeping it spinning at all times)
  11. 2ndGenToyotaFan

    2ndGenToyotaFan Ice-Bound Moderator

    Messages:
    8,821
    Location:
    It's complicated....
    Put the trans in 1st, push in the pedal, and start the truck. If the truck takes off, then clearly the clutch is not disengaging, or the pilot bearing is done.... Check out the hydraulic system, but if it checks out fine, you're gonna have to pull the trans one way or another.

  12. Bogo

    Bogo

    Messages:
    1,748
    Location:
    On the farm
    I say warn bearing, synchronizer or shift key.

    Has it ever been low on oil?
  13. fjman

    fjman

    Messages:
    1,110
    Location:
    DC
    well it looks like the tranny needs to come out.. never done it so looks like i may need to bring it somewhere :(
  14. missouriman

    missouriman

    Messages:
    647
    is the release fork on the side of the transmission moving?

    if you are trying to check it alone, tie it back with a small ratchet strap and see if the clutch is still stuck.
  15. fjman

    fjman

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    1,110
    Location:
    DC
    is that the part with the rubber boot on it?
  16. PGH854runner

    PGH854runner

    Messages:
    700
    Location:
    Pittsburgh,PA
    i had this problem on an 86 civic it turned out thepreesure plate was cracked allowing partial disengagment but you couldnt shift it while running.......after a quick shift fork check you gootta drop the tranny
  17. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

    Messages:
    19,623
    Location:
    MN



    How did you get to this conclusion?
  18. 2ndGenToyotaFan

    2ndGenToyotaFan Ice-Bound Moderator

    Messages:
    8,821
    Location:
    It's complicated....
    Dropping the trans is not that hard, just takes some patience. I replaced my clutch by myself in 5 hours with the help of a trans jack.

    It's not much more than turning bolts.... :cheers:
  19. digital

    digital

    Messages:
    196
    ^^^^ What he said...Call one of your buddies over for the day and share a case of your favorite suds with him afterward.

    Having two floor jacks makes it easier when dropping the tranny. Disconnect the drive shafts, remove the shifter boots, tranny wiring harnesses and the bolts for the rear tranny mount and thats pretty much it.

    Go to your local auto-zoo and rent a bearing puller for free to remove the pilot bearing.
  20. missouriman

    missouriman

    Messages:
    647

    yes, go's in the pass side of the bell housing

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