shifting an 8 speed

Discussion in 'Questions From New Drivers' started by orferd, Mar 21, 2012.

  1. orferd

    orferd Bobtail Member

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    Jan 17, 2012
    California
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    Could someone please give me the rpm range and speeds for upshifting and downshifting an 8 speed. Im pretty sure the rpm range is 1000-1500 but im unsure of the speeds, especially for downshifting. Ive only driven a 10 speed but ill need to know an 8 speed for my road test. Thanks a ton.
     
  2. Round2

    Round2 Light Load Member

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    Feb 14, 2012
    WA
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    Should be 400 rpm splits. Try shifting at 900-1300 on the low range and 1100-1500 on the high side. 900-1300 on your drops.
     
  3. xlsdraw

    xlsdraw Road Train Member

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    Nov 17, 2010
    Winter Haven, Florida
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    When I change trannies I just tend to trust my ears. They'll tell you what to do if you're tuned in to the engine like you should be.
     
  4. Round2

    Round2 Light Load Member

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    Feb 14, 2012
    WA
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    Series 60's sound fine at 14-18 but the MPG's suck up there!
     
  5. Brownyjr36

    Brownyjr36 Bobtail Member

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    Jun 26, 2011
    Coon rapids, mn
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    I upshift around 1400' and down i try to be below 900. As a rule of thumb, when going down, multiply gear by 5 for mph. Ex. 35 mph, 7th, 25 mph, 5th.
     
  6. xFreeWord420x

    xFreeWord420x Light Load Member

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    Mar 10, 2012
    Leetonia, Ohio
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    Wish someone would have told me that when I was going through school.. that is a #### good ROT.
     
  7. MNoutkast

    MNoutkast Medium Load Member

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    Feb 24, 2012
    Elk River, MN
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    Someone doesn't have a Detroit, LOL if I shifted at 1400 the truck would fall on its face and laugh at me. That is a pretty good "rough" rule of thumb that can really help newer drivers out!
     
  8. xFreeWord420x

    xFreeWord420x Light Load Member

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    Mar 10, 2012
    Leetonia, Ohio
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    Yeah, the single stack mack attack would cough and die if I shifted then.. But I think our trucks are geared differently, since every load puts us at at least 80,000.. I shift @ about 2000-2100.. and down at 12-1300..
     
  9. Everett

    Everett Crusty Shorts, What???

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    Oct 20, 2009
    Hampton,Ia
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    go too u tube , type in the shearch box tons of great info there
     
  10. MNoutkast

    MNoutkast Medium Load Member

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    Feb 24, 2012
    Elk River, MN
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    I don't have to run em' quite that high but loaded its probably 1800 or so, maybe 1650 or a little higher empty. But I am either empty at 33,000 or fully loaded to 80,000 there really is no in between for me.
     
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