05 Sierra 1500 Auto Transmission Acting Weird

Discussion in 'Chevy Truck Forum' started by Sparkys Truck, Nov 12, 2017.

  1. Sparkys Truck

    Sparkys Truck New Member

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    I have an 05 Sierra 1500 basic truck with not much in the options dept.
    6cyl.
    Auto transmission.

    After rolling along on the highway and going down long stretches of downhill highway with my foot completely off the gas when the vehicle once again begins to go slightly uphill and I begin to loose speed I apply the gas pedal once again and occasionally the truck will run up in rpm like the transmission is slipping and it will loose power.
    A couple of things seem to remedy this.
    If my foot is off the gas long enough for the rpm's to drop below 14-1500 or so it seems to be OK and will recover once I start the uphill again.
    Also if I put the truck in neutral and then back into drive all is fine.
    Other than this the truck runs strong with not even a trace of transmission problems.

    Very puzzling.

    Thanks in advance for your replies.
     
  2. leolkfrm

    leolkfrm Full Member

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    needs a good scanner, sounds like maybe a sensor acting up
     
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  3. Pallet Pete

    Pallet Pete Full Member

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    First is there a service light on?

    The first thing I always check is fluid level. I can’t tell ya how many I’ve worked on and they have really weird issues that turn out to be a low fluid or clogged filter.
     
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  4. MikeG

    MikeG Full Member

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    When was the last time the Trans was serviced? Fluid and filter change is a good start.
     
  5. Sparkys Truck

    Sparkys Truck New Member

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    It was scanned and no codes show up.
     
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  6. Sparkys Truck

    Sparkys Truck New Member

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    LOL Never.
     
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  7. MikeG

    MikeG Full Member

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    :rofl:

    I'd give that a shot.
     
  8. poncho62

    poncho62 Full Member

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    How many miles on it?
     
  9. dirtrider73068

    dirtrider73068 Senior Moderator
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    If the fluid has never been changed don't do it, the tranny will give up and you will be rebuilding. I have alot of people talk about this and ole timers that have said this as well, if you have never changed don't, doing so pulls out the clutch disc particales and they are not there to help engage the cutches and will burn up and slip
     
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  10. leolkfrm

    leolkfrm Full Member

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    a scanner not a code reader and check senor readings
     

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