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hard shifting tranny

Discussion in 'Chevy Trucks' started by rewoodworking, Dec 19, 2003.

  1. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    i have a 2000 gmc 2500 automatic when it is shifting from first to second it shifts hard but not all the time and sometimes harder than others truck has about 36000 miles

    i also had a 2000 chevy that is doing the same thing
     
  2. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    well i gess i am the only one with this problem
     
  3. 3D Lawncare

    3D Lawncare Junior Member
    Messages: 16

    does your truck do it when it cold, if so it does it for a reason. GM has it do that to keep the rpm's higher to warm the motor faster. But if it just does it when it wants the filter and fluid may need to be changed.
     
  4. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    i will try it today thanks
     
  5. SWC

    SWC Senior Member
    from VA
    Messages: 134

    It sounds like a clogged filter, but it might be the modulator valve sticking or a cracked hose.
     
  6. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    OK i changed my filter and fluid so far so good only time will tell :(
     
  7. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    ok i changed it and it do not hard shift for a couple of days but it did it today ( twice):realmad: :confused: :confused: :(
     
  8. SWC

    SWC Senior Member
    from VA
    Messages: 134

    Could be the modulator valve.

    Theirs a hose there too, I think they call it a bypass hose, it may be cracked.

    Does it just stick when you first pull out, and seem to do O.K. after you get going?
     
  9. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    always when i start out when im going its fine only when i come to a stop and then go but not all the time

    when i was in oh temp went up in mountins and it hard shifted in all gears but i got back and changed filter and oil and it seemed fine
     
  10. JMR

    JMR Senior Member
    Messages: 567

    Here is the GM service bulletin dealing with this exact problem. #01-07-30-023. There is an update valve body to correct this problem. A spool valve in the valve body sticks when the vehicle gets warmed up. Usually starts occurring on vehicles with 36K or more miles on it. The bulletin gives the part # for the updated valve body. Your truck should use GM part #22221161 for 5.7L or 22221162 for the 4.8L or 5.3L engines. Transmission broadcast code (those letters on that sticker on the inside of the glovebox door) should be matched to the bulletin just to make sure. I can give you the broadcast codes if you need them. Let me know. good luck.
     
  11. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    will gm fix it on a recall
     
  12. JMR

    JMR Senior Member
    Messages: 567

    NO. It is not a recall notice. It is just a bulletin acknowledging the problem and the associated repair unless the truck is still under warranty.
     
  13. mac3897

    mac3897 Member
    from MA
    Messages: 68

    JMR
    Any way you can post the whole bulletin? My truck is doing that same thing. It has 35,000 mile on it and is going to the dealer this friday to be checked. It might help if I give them somewhere to start looking.

    Thanks
    MAC
     
  14. JMR

    JMR Senior Member
    Messages: 567

    I could e-mail you the bulletin if you need it. It is not an attachable file type. A good repair or trans. shop be able to make the necessary repairs without removal of the transmission from the vehicle. Or if your mechanically inclined you might be able to do it yourself. Usually a job for a professional technician.
     
  15. mac3897

    mac3897 Member
    from MA
    Messages: 68

    JRM
    Can you email it to me? Cut and paste is fine.
    Thanks

    mac3897@hotmail.com

    I appreciate it.
     
  16. rewoodworking

    rewoodworking Senior Member
    Messages: 223

    if you don't mind send it to me also i am out of warranty so i have to do it myself
     
  17. RUSTYplowtruck

    RUSTYplowtruck Junior Member
    Messages: 1

    Late model chevy shifting

    I have a 99 z71, is there a tow/haul button? Mine has one and when it's engaged, it shifts really late. I couldnt fiure it out at first, but its nice when you have a load so it dont shift constantly up and down
     
  18. JMR

    JMR Senior Member
    Messages: 567

    This bulletin applies to 96-00 trucks. If you need a copy get me a e-mail address. MAC3897 I e-mailed you a copy, but I'm not sure if it applies to your truck. The bulletin # is 01-07-30-023 any good repair shop should be able to look up this bulletin by #.
     
  19. rewoodworking

    rewoodworking Senior Member
    Messages: 223

  20. JMR

    JMR Senior Member
    Messages: 567

    GM also has a TSB for the 2002 trucks. TSB # 01-07-30-030. I can e-mail it also to anyone who needs a copy. It is a different repair procedure. As always verification of the problem and strictly following diagnostic procedures should be done before proceeding with TSB updates.