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transmission up/down shift

Discussion in 'General Discussions' started by Merle, Feb 6, 2020.

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  1. Merle

    Merle Junior Member

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    Has anyone had an issue with the 8 speed not holding in 8th gear. mine downshifts to 7th at the slightest incline then back up, kinda like a yoyo
    Its a 2019 ram classic 5.7 with the 8 speed transmission.
     
  2. phantomfixer

    phantomfixer Member

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    That seems normal to me.8th gear is almost like an overdrive.You need to be traveling at a pretty decent speed to stay in 8th gear.If you come to a hill it's not staying in 8th gear
     
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  3. TruckNut

    TruckNut Senior Member

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    Do you have the 3.21 or the 3.92? That alone could make the difference in jumping back to 7th gear.
     
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  4. Ridgerunner665

    Ridgerunner665 Member

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    7th and 8th are both overdrive gears...6th is the direct drive gear.

    Sent from my SM-G960U using Tapatalk
     
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  5. Merle

    Merle Junior Member

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    Am I the only one that as observed this condition or is it prevalent on all 5.7 w/8sped
     
  6. Ridgerunner665

    Ridgerunner665 Member

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    Any auto transmission with 8 to 10 gears is going to be "busy"...its just them doing what they were designed to do.



    Sent from my SM-G960U using Tapatalk
     
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  7. tidefan1967

    tidefan1967 Senior Member Supporting Member

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    That is completely normal operation with 3.21 gears even on very slight grades. If you had 3.92's it would happen a lot less. Don't give it another thought because it isn't hurting a thing.
     
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  8. kurek

    kurek Senior Member

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    If you've changed tire size or added accessories that change the aerodynamics or weight significantly it could affect the shift profile too. These transmissions do have some adaptive program features to provide consistent behavior as the fluid and clutches age so if yours is new it may just be finding its groove. I have not owned a vehicle with the 8HP but I had one with the 9 speed (also made by the same company) and that thing supposedly has 40 distinct shift maps it picks between & requires a bit of driving to establish patterns.
     
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  9. PoMansRam

    PoMansRam Senior Member

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    Sounds normal.

    The 8spd in my 2017 Pentastar powered Ram 1500 w/ 3.21 gears adapted a little differently. Mine holds 7th if there's any inclines or slight throttle movements, but like said, holding in 8th for long periods of time is rare.

    I actually prefer to keep tow mode on all the time. It won't go beyond 7th. A little loss in fuel economy.
     
  10. Potatomafia

    Potatomafia Senior Member

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    My 2015 with 3.92s will downshift to 7th or 6th when going up a slight hill or speeding up slightly on a 70mph freeway. Sometimes it seems to hang in 7th and won't upshift back to 8th even after I completely let off. I usually have to coax it back into 8th using the Shift+ button on the steering wheel.
     

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