Question about 2003 GMC Sierra 1500

4 Answers

2003 SIERRA GMC 4X4 W/ AUTOMATIC TRANSMISSION. DRIVING ON HWY. LOST 3RD. AND OVERDRIVE ENGINE REVS ONLY. SHIFT INTO 1ST OR 2ND DRIVES OK. WHAT COULD BE THE PROBLEM.?

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  • 4 more comments 
  • saintlen Jun 28, 2009

    LET'S TRY THIS AGAIN. I HAVE A 2003 GMC SIERRA 4X4 1500 PICKUP TRUCK. WHILE DRIVING ON HIGHWAY I LOST OVERDRIVE AND 3RD GEAR. WHEN I PUT IT INTO DRIVE ONE OR DRIVE 2 THE TRUCK RUNS PERFECTLY. WHEN I PUT IT BACK INTO DRIVE 3 THE ENGINE REVES UP ONLY, BUT NO TRANSMISSION ACTION. HAD TO DRIVE HOME 26 MILES IN 2ND GEAR. WHAT COULD BE THE PROBLEM?

  • saintlen Jun 28, 2009

    THEN WHY DO I HAVE 1ST & 2ND DRIVE.??

  • saintlen Jun 28, 2009

    SO , YOUR SAYING ITS AN INTERNAL PROBLEM AND THE TRANY WILL HAVE TO BE TAKEN OUT AND APART TO FIX IT. RIGHT.??

  • saintlen Jun 28, 2009

    WOULD DOWN SHIFTING FROM 3RD TO 2ND TO SLOW DOWN HELP TO CAUSE THIS PROBLEM OR NOT.?

  • saintlen Jul 02, 2009

    HAY , I DO NOT KNOW WHAT HAPPENED BUT CARFREAK 1217 WAS RIGHT AND I WANT TO GIVE HIM THE CREDIT. BUT SOME HOW I LOST CONTACT WITH HIM.
    I CALLED A LOCAL YARD GOT A TRANY WITH ONLY 35,000 MILES FOR $1050. AND HAD IT IN STALLED
    FOR $500.00. RUNS GREAT NOW. THIS TRUCK HAS OVER 225,000 MILES ON IT AND RUNS LIKE NEW NOW . THANKS TO CARFREAK 1217 FOR HIS HELP, BUT I DO NOT KNOW HOW TO PAY HIM KNOW.
    ANY HELP WITH THAT.? SOME ONE.

  • saintlen Jul 02, 2009

    DID YOU READ WHAT WROTE. CARFREAK 1217 WAS RIGHT.

    HOW DO I GIVE HIM THE CREDIT AND ACCEPT HIS ANSWER.??


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4 Answers

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  • Master
  • 10,515 Answers

Hi,

There might be million of reasons for the same and to be frank you would agree.Your symptoms point to pressure regulator/ boost valve sticking in valve body. When you shake the valve body from front to rear, you should be able to hear the boost valve rattle. Carefully pry the valves from their seated positions.
They should slide smoothly and return to their seated position without binding. You should be able to buy new valve body gaskets at any tranny shop for a few dollars.A good place to start would be to test the vacuum modulator and be surethe modulator valve in the trans is not stuck, then check the governorfor proper operation and calibration and check it's gear. All can bedone without pulling the pan off.
Another possibility might be the center seal being left out of thedirect drum for a greater fluid appy area in third, you need to block areverse passage when doing this or reverse will come on with third.This plug may have come loose if it actually worked at one time.

Also, check for CODES. This is very important as i am sure you would get certain codes like
740 753 758 in this case .
The most likely cause of this condition may be a loss of voltage to the transmission solenoid power supply circuit.
Thiscondition may also be the result of an incorrect installation of anaftermarket electronic device such as a remote starter or alarm system.

Hope i helped you.

DO RATE THE SOLUTION.

Thanks for using 'Fixya'.



Posted on Jul 02, 2009

  • taran_2005
    taran_2005 Jul 02, 2009

    Hi,

    I really apologize, but if the question would be transferred to other expert, You cannot get back to the same expert.

    I agree , but That's the fact.

    If you wish, you can Rate the solution and close the thread.

    Take Care.

    Thanks for using "Fixya".


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  • Expert
  • 109 Answers

Forward sprag assembly came apart in transmission. This is very common with these 4L60E transmissions.

Posted on Jun 28, 2009

  • 3 more comments 
  • Luke  Luke
    Luke Luke Jun 28, 2009

    Because forward sprag rotates the sun gear which rotates the 3-4 gear drum

  • Luke  Luke
    Luke Luke Jun 28, 2009

    Was I able to answer your Question?

  • Luke  Luke
    Luke Luke Jun 28, 2009

    Yes that is what I am saying. I deal with the problem your having all time.

  • Luke  Luke
    Luke Luke Jun 28, 2009

    If it was electrical you would only have 2nd gear and a check engine light.

  • Luke  Luke
    Luke Luke Jul 11, 2009

    I not sure how I get credit. But I am glad I was able to help.

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  • GMC Master
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I can't see what the other replies to you were but I can tell you this, if you can get your truck to AAMCO transmission shop, they will evaluate it for free and will not doing anything to it without your consent. If you don't have that type of transmission specialst around, take it to one that is reputable. But, from YOUR replies, it sounds as if your tranny is bad and needs a rebuild. I know it is not a ricket scientist answer but unless you have the special tools to overhaul it, take it in to get repaired.

Regardless of what the "experts" here say, you are the one that will be without your truck and the one paying for it, not us.

Take it in and get it rebuilt.

Posted on Jun 29, 2009

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  • Master
  • 3,917 Answers

Hi,

This sounds like a timing issue. When you go up a grade, or have a loss of
power, it sounds like your timing isnt retarding enough. I cant remember
though whether you have vacuum advance on those vehicles anymore or not.. If
you have it, check for a vacuum leak. If you dont have it, the check your
crankshaft sensor.
or
Check your knock sensor, also. Had a similar problem, and that was the solution

Thanks for contacting Fixya

Posted on Jun 28, 2009

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