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Transmission pops out of gear under heavy load

Discussion in 'The Hokey Ass Message Board' started by blown383, Jul 28, 2010.

  1. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    Hello,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p> </o:p>
    I just dropped in my freshly built 383 stroker with a 6-71 blower into my Monte Carlo. It is married up to a T56 (6 speed manual from 97 formula firebird). I also have 4:10 gears in the rear end if that has any influence on my problem. I got it running over the weekend and drove it around the block. I was going down the road in 4<SUP>th</SUP> gear at about 1500 rpms and I juiced it. It almost immediately kicked it out of gear pretty violently. (shifter smashed my hand pretty good). I put it back in gear and it drove fine. I then put it into 5<SUP>th</SUP> at about 2000 rpms and once in gear for a bit stomped on it and the same thing happened. <o:p></o:p>
    <o:p> </o:p>
    Any thoughts on what could be causing this? <o:p></o:p>
     
  2. pcterm2
    Joined: Aug 25, 2009
    Posts: 551

    pcterm2
    Member

  3. Deuces
    Joined: Nov 3, 2009
    Posts: 26,848

    Deuces

    Motor mounts and trans mount... You running solid engine mounts and a rubber trans mount???
     
  4. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    First guess excessive end float on the main shaft= bad bearing etc. Second idea worn shift forks.
     
  5. Skankin' Rat Fink
    Joined: Jun 18, 2006
    Posts: 1,547

    Skankin' Rat Fink
    Member
    from NYC

    Pilot hole in the bellhousing is the right size?
     
  6. You're not still running the Monte's column shift are you?;)
     
  7. red baron
    Joined: Jun 2, 2007
    Posts: 596

    red baron
    Member
    from o'side

    Motor mounts or trans mounts allowing everything to move to much, or more likely worn shifter linkages/bushings, or worn synchros (internal trans probs).
     
  8. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    I am not sure I follow you on this. Tis is my first time playing with a manual transmission. I had someone put in the T56 with a 350 I had in at the time. when i swapped motors i left the transmission in the car, swapped over the clutch onto the new motor and slid it into place. I left the bellhousing connected to the transmission.

     
  9. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    How would I be able to check for this? if that is the case what are my options?

     
  10. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    Lol No, shifter came with the trans. orininally had a console shift when it was an automatic.

     
  11. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    How would I know if it was the mounts? If that is the case would swapping to poly mounts help? how do i check if it is the linkage/bushings that are worn? I am hoping that it is not the synchros. I don't know much but i know that means a new transmission or a rebuild.

     
  12. 52pig
    Joined: Jun 9, 2007
    Posts: 435

    52pig
    Member

    My internet guess would be to look towards a worn synchro and/or gear. I usually wear out 2nd to 3rd on my transmissions, but a 3-4 with that monster could go for sure.
    I guess before I went too crazy I'd check the linkage and make sure it isn't out of adjustment.
     
    Last edited: Jun 1, 2011
  13. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    When you say the linkage are you talking abouit the shift linkage or the clutch linkage. I am pretty new to tranmissions. I had someone else put in the 6 speed and when i swapped motors i never took the transmission out just to be certain nothing would change or get crossed up but i guess it may have.

     
  14. refried confusion
    Joined: Nov 14, 2010
    Posts: 277

    refried confusion
    Member

    ______________
     
    Last edited: Dec 5, 2012
  15. 52pig
    Joined: Jun 9, 2007
    Posts: 435

    52pig
    Member

    The shift linkage on the trans, make sure it is fully engaging fourth. It may just need a little turn or you may need a rebuild.
    Have some one shift from 3 to 4 while you watch, make sure there isn't any slop. If it seems good and has full movement, pull er and take her in.
     
  16. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 14,432

    Johnny Gee
    Member
    from Downey, Ca

    X3. Bad ingagement teeth on gear or bad slider.
     
  17. customstude53
    Joined: Jun 10, 2005
    Posts: 40

    customstude53
    Member
    from MA

    I'd say synchros. Figure that trans is 14 yrs old, Most likely has never been rebuilt(no one drove 97 formulas easy either) and a blown 383 small block is pushing a lot of snot through a trans that came in a car with around 300hp little more if it was a ws6. Save your money on the rebuild and buy a tremec.
     
  18. CB_Chief
    Joined: Aug 17, 2006
    Posts: 775

    CB_Chief
    Member
    from Oklahoma

    Did somebody miss this? " into my Monte Carlo". I appreciate the fact that everyone is trying to help but this is obviously an off topic vehicle. Have the rules been relaxed and now we can start talking about any year, make, model?
     
    Last edited: Jun 1, 2011
  19. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 14,432

    Johnny Gee
    Member
    from Downey, Ca

    :eek::eek::D
     
  20. My thoughts eggzactly!
     
  21. 61falcon
    Joined: Jan 1, 2009
    Posts: 772

    61falcon
    Member

    i make a motion to close this thread. all in favor?
     
  22. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    Thank you I will try that and see where I get. Thank you for the advise.

     
  23. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    I have gotten that same thought from a few people now that I have spoken with. I am really just trying to exhaust other options before I have to go that route.

     
  24. blown383
    Joined: May 2, 2010
    Posts: 16

    blown383
    Member

    I appreciate it also. I was unaware that there was a criteria on make, model and year. I apoligize that I missed that somewhere along the line. I appreciate the input I got from those looking to help. Thank you, sorry again.

     
  25. 49ratfink
    Joined: Feb 8, 2004
    Posts: 25,246

    49ratfink
    Member
    from California


    this is not a Monte Carlo question, but a transmission question. it could be in any car. I don't think the Monte Carlo is causing the problem. maybe he shoud put the motor/trans in a Model A and see if that fixes it.:cool:
     
  26. Atwater Mike
    Joined: May 31, 2002
    Posts: 11,618

    Atwater Mike
    Member

    HAH! Good one!!! Uh...to the problem, lotsa H.P. thru the trans now, so any wear would be multiplied. On the new engine, was the pilot bushing/bearing (in the crank) good?
    Worn pilot would do this in the 'higher' gears.
     

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