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something's wrong (transmission?)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Jonathan, Jun 1, 2001.

  1. Jonathan

    Jonathan 1/2 ton status

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    something\'s wrong (transmission?)

    Today, I drove my blazer alot and after a while, it started to shake under accelleration. What could this be? Loose bolt, engine mount, transmission going bad, axle, transfer case. I think my transmission is overfilled if the dipstick is right. I also hit a speed bump hard and the blazer just stopped, I thought I had broken an axle of something, but the transmission had just bounced into neutral. Any ideas?

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <A target="_blank" HREF=http://www.Jonathan.coloradok5.com>http://www.Jonathan.coloradok5.com</A>
     
  2. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: something\'s wrong (transmission?)

    Could be all of those things - start eliminating.
    Others - linkage loose or not adjusted properly, causing tranny to act poorly? Tranny mounts broken?
     
  3. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: something\'s wrong (transmission?)

    Assuming you have auto tranny.....
     
  4. 90K5

    90K5 1/2 ton status

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    Re: something\'s wrong (transmission?)

    Sounds like a bad u-joint except for stopping at the speedbump...unless the joint just broke...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  5. Jonathan

    Jonathan 1/2 ton status

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    Re: something\'s wrong (transmission?)

    The u-joint didn't just break, the transmission really did bounce into neutral, I just brought the shifter down one more click and drove away fine (except for the shaking). Why it did it, I don't know.

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <A target="_blank" HREF=http://www.Jonathan.coloradok5.com>http://www.Jonathan.coloradok5.com</A>
     
  6. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: something\'s wrong (transmission?)

    Secure your vehicle and you lay under while someone does a brake-stand. Watch for excessive movement and seperation on the entire drivetrain. Please be careful if you follow this suggestion. Also, don't get carried away with the brake stand.
     
  7. elkboy

    elkboy 1/2 ton status

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    Re: something\'s wrong (transmission?)

    I had a similar problem with a ford, turned out to be the lockup torque converter. I changed the fluid and the problem went away. I gues some of the newer torque converters are pretty sensative to fluid condition.

    <font color=red> Elkboy </font color=red> 82 K5 fuel injected H.O.305, TH350/205, 14bolt/10bolt and 39.5 TSL's.
     
  8. Jonathan

    Jonathan 1/2 ton status

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    Re: something\'s wrong (transmission?)

    Just have some one stand on the brake pedal? Where should I look for separation? U-joints

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <A target="_blank" HREF=http://www.Jonathan.coloradok5.com>http://www.Jonathan.coloradok5.com</A>
     
  9. Jonathan

    Jonathan 1/2 ton status

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    Re: something\'s wrong (transmission?)

    Could a transmission fluid change fix it? Or at least help?

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <A target="_blank" HREF=http://www.Jonathan.coloradok5.com>http://www.Jonathan.coloradok5.com</A>
     
  10. newyorkin

    newyorkin 1 ton status

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    Re: something\'s wrong (transmission?)

    Does the vibration go away when you get moving? is it present in top gear (overdrive at 45 mph I think, with lockup)? Is it present only during shifts? If it's always there, check the ujoints. If it's only there during shifts, you have something loose that's letting the driveline jump around. I'd bet that's why it jumped to nuetral after the speed bump, the driveline jump, and the linkage got pushed into nuetral.

    I think he means have someone hold the brake, put the truck in drive, and rev it to see your whole driveline move, I.E. engine upward from mounts, trans up from mount, diff movement, etc.. Just make sure you have plenty of room for the truck to pass over you in case the revver goofs (things'll happen real fast then...). I'd even say lay down next to the truck, not under it. If you want to check the ujoints, you can just grab you driveshaft and wiggle it looking for play. The key there is to look for seperate movement (play) between the driveshaft and the diff yoke, or driveshaft and slip yoke. If they move together as one solid piece, tehn you should be ok (if it's shaking that much and it IS the u-joint, you WILL feel play in the joint).
    Definately check the linkage, and make sure you listen for the trans to click into the gears, and don't go just by the column indicator. You could also have had the tranny partially engaged due to worn or de-adjusted linkage, causing a lower volume fluid flow (not sure how that would effect it, though, not really a big tranny guy myself).
    Tranny fluid expands when it heats up, so you may be experiencing an overheated tranny, and why it looks overfilled. How was your engine temp? High? Has the problem gone away when the truck has cooled?
    If you're noticing any engine wackiness, that could be misread as tranny problems (maybe clogged cat? Is the catalytic convertor bright red when you're warmed up?).

    Ratch
    **<A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A> What more is there to life?**
     
  11. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: something\'s wrong (transmission?)

    Yes - what newyorkin said.
    And servicing the tranny will never hurt.

    Jonathan, how far away is your nearst CK5 member? I would gladly help but wouldn't make it to Arkansas for a few days..... I think you should try to find some assistance if you dont feel comfortable with these suggestions.
    Any more symptoms you can give us will help also.
    Dave
     

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