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Gutless Cat

Discussion in 'Trucks [ Eighteen Wheelers ]' started by okcderek, Apr 29, 2010.

Page 1 of 2
  1. Apr 29, 2010 #1
    okcderek

    okcderek Bobtail Member

    10
    0
    Apr 17, 2009
    Okc, Ok
    0
    I have a 94 Pete 357 dumptruck w/ a Cat3176 and 8speed in it. Not sure on the rearends. My problem is the truck feels gutless on the top end. Its all I can do to get up to speed on the highway when loaded. And when its empty, it tops out at 65...and that's all she's got. Is there anything I can do to get more get up and go out of it?? Would a different transmission help or rearends? I have even thought of going up to 24.5s might help some.. Any help would be greatly appreciated. The truck is in good shape, well taken care of, double framed, 2 drop axels, heavy hauler.....it just needs more power!!
    [​IMG]
     
    Last edited: Apr 30, 2010
    okcderek, Apr 29, 2010
    okcderek, Apr 29, 2010
    #1
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  3. Apr 29, 2010 #2
    stranger

    stranger Road Train Member

    3,640
    4,959
    Oct 10, 2006
    NC
    0
    What RPMs are you turning at 65 MPH?
     
    stranger, Apr 29, 2010
    stranger, Apr 29, 2010
    #2
  4. Apr 30, 2010 #3
    okcderek

    okcderek Bobtail Member

    10
    0
    Apr 17, 2009
    Okc, Ok
    0
    At 65 my tach sets at 20
     
    okcderek, Apr 30, 2010
    okcderek, Apr 30, 2010
    #3
  5. Apr 30, 2010 #4
    stranger

    stranger Road Train Member

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    Oct 10, 2006
    NC
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    It's not the engine, you are out of RPMs. You will need to change the rears. If you are running 22.5 low pro tires, then going to 11R24.5 would help some, but not much if you go from 11R22.5 to 11R24.5.

    It would be money well spent to get it on a dyno first to make sure the engine is performing as it should before spending money on gears.
     
    stranger, Apr 30, 2010
    stranger, Apr 30, 2010
    #4
  7. Apr 30, 2010 #5
    okcderek

    okcderek Bobtail Member

    10
    0
    Apr 17, 2009
    Okc, Ok
    0
    Thanks for your input. I want to say I am running 295/75/22.5 right now. Someone else told me to put it on a dyno 1st before I just started buying parts for it.
     
    okcderek, Apr 30, 2010
    okcderek, Apr 30, 2010
    #5
  8. Apr 30, 2010 #6
    stranger

    stranger Road Train Member

    3,640
    4,959
    Oct 10, 2006
    NC
    0
    If you are topping out at 65 MPH and 2000 RPM, then you are running 4.63 or 4.88 gears, assuming you have an overdrive transmission. Going to tall 24.5 would top you out at around 71 MPH. Not much difference.

    You could have a direct drive transmission and have a 3.55 or 3.70 rears.
     
    stranger, Apr 30, 2010
    stranger, Apr 30, 2010
    #6
  9. Apr 30, 2010 #7
    okcderek

    okcderek Bobtail Member

    10
    0
    Apr 17, 2009
    Okc, Ok
    0
    Its an Eaton 8spd is about all I know about it as far as the transmission. Well I will look into having it put on a dyno. It has spring suspension now, but I have a buddy w/ Pete air suspension rear clip w/ new drums and pads. And taller gears too...although not sure what gears exactly. Would like to do something like that and swap to air suspension at the same time. I got the truck for next to nothing litterally. And I haul asphalt w/ it and occasionally have to haul rock. But when I haul rock w/ it I go down south and there are more hills down towards our rock quarry and it just sucks to go down there.
     
    okcderek, Apr 30, 2010
    okcderek, Apr 30, 2010
    #7
  10. Apr 30, 2010 #8
    stranger

    stranger Road Train Member

    3,640
    4,959
    Oct 10, 2006
    NC
    0
    There should be a tag on the right side of the transmission that tells the series, like RTO or RT and some numbers that will tell what it is. The door jam or glove box may have a sticker that tells this also.
     
    stranger, Apr 30, 2010
    stranger, Apr 30, 2010
    #8
  11. Apr 30, 2010 #9
    okcderek

    okcderek Bobtail Member

    10
    0
    Apr 17, 2009
    Okc, Ok
    0
    I will look tomorrow for it.
     
    okcderek, Apr 30, 2010
    okcderek, Apr 30, 2010
    #9
  12. May 2, 2010 #10
    JohnP3

    JohnP3 Road Train Member

    1,594
    684
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    One thing I use to explain to drivers that wanted more power and more speed out of a unit is that the truck was speced out to do a job, yours is made to haul gravel and make you money. You can change the transmission to an 18 speed double over and go fast. Your truck is made to go 55 MPH, and make money. Being able to go faster and you would only be able to do it empty, When it is loaded you are not going to get it to go much faster, and you will spend a lot of money for nothing. Just a thought!
     
    JohnP3, May 2, 2010
    JohnP3, May 2, 2010
    #10
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