Question about 1993 GMC Suburban

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I have a 1993 gmc suburban 4 x 4. It started to shift roughly out of first into second. Then it runs fine. Almost as if it's skipping second gear. Tranny is rebuilt and less than 10k miles. Any suggestions? E mail is sfescurtis@gmail.com thanks

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  • sfescurtis Sep 28, 2010

    interesting? Is that an electrical component? Or do ya gotta pull er out?

  • sfescurtis Sep 28, 2010

    sounds easy enough.... Is it difficult to remove and restore? And how will I know which one?

  • sfescurtis Sep 28, 2010

    how will I know which one and is it difficult to remove and restore?

  • sfescurtis Sep 28, 2010

    my 1993 gmc suburban just all of a sudden started shifting rough from first to second. It is an automatic and has less than 10k on rebuild. It's almost as if it's going from first to third. If I time it right with the gas pedal I can ease off the gas and shift it smoothly. It runs fine after that. Is this a shift solenoid? If so which one and is it difficult to replace? Curtis arvada colorado

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  • Master
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Hi!
The 4L80-E transmission uses 2 electric shift solenoids to control transmission upshifts and downshifts. In addition, a force motor (also referred to as pressure control solenoid) controls hydraulic line pressure, and a Torque Converter Clutch (TCC) solenoid controls TCC application. Solenoid is turned on and off by the Powertrain Control Module (PCM) or Transmission Control Module (TCM). PCM/TCM has on-board self-diagnostics to help identify any components or circuits that may need further testing. Shift solenoid holds hydraulic pressure when it is on and releases pressure when it is off. This action controls the shift valves inside valve body. By switching one or both solenoids on or off, different combinations of clutches, sprags and bands are operated.
Models with gasoline engines use a Powertrain Control Module (PCM) computer. Models with diesel engines use a Transmission Control Module (TCM) computer. These computers control TCC, force motor (hydraulic pressure) and shift solenoids "A" and "B".
If your transmission was rebuilt and these solenoids were not replaced. It is likely that one of them is acting up. You should have your computer scanned for trouble codes, there are many autoparts stores like AutoZone and Checkers that do this for FREE, Once you know which solenoid is failing, just remove the tranny's fluid pan, (just like if you where going to change the trans. fluid) and with the diagram I sent you, identify the defective solenoid and replace it. It is a pretty simple job to do, but if you take the vehicle to a shop, you may get ripped off.
I will send you a better copy of this diagram by mail.
I have a 1993 gmc - 8d4753f.gif

Posted on Sep 28, 2010

  • Rene J Solis Oct 18, 2010

    I'm glad I could be of help. And thanks for the feedback. a HELPFUL Rating and a TESTIMONIAL would be greatly appreciated. Thank you for using FixYa

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  • Master
  • 10,319 Answers

I can be the 1st gear solenoid going bad

Posted on Sep 27, 2010

  • frank thomas wilson
    frank thomas wilson Sep 28, 2010

    inside the trans pan area are solenoids for the shifting with all are electronic

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