Vinny's Peterbilt Mystery

Discussion in 'Peterbilt Forum' started by vinijackson, Nov 29, 2011.

  1. vinijackson

    vinijackson Bobtail Member

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    Sep 11, 2011
    Williston Vermont
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    Sorry.... Then my wheel base would be 360 - 49" (24.5) tires for a 311 wheel base?
     
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  3. Superwav

    Superwav Bobtail Member

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    Jan 27, 2012
    Monmouth, OR
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    Vini

    Tire size has nothing to do with wheelbase, but it will effect ride height and theoretical over all gear ratio.
    Wheelbase is measured from the centerline of the front spindle on the steer axle, to the centerline of the rear axle.
    Your bumper-to-bumper measurements are reffered to as 'LOA' or 'Length Over All'.
     
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  4. haulhand

    haulhand Road Train Member


    Actually "true" wheelbase is measured from the center of the steer to the center of the rear suspension not the rear axle. Just for informations sake.
     
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  5. Klleetrucking

    Klleetrucking Medium Load Member

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    Dec 11, 2010
    S.C.
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    Last edited: Oct 8, 2012
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  6. vinijackson

    vinijackson Bobtail Member

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    Sep 11, 2011
    Williston Vermont
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    Suppose I know I have 6" side walls and 24.5 tires, I know the outside diameter of the rear tire is even with the rear of the frame, and the outside diameter of the front tire is 6" from the end of the frame? Just to be in the ball park ......24.5 plus 12" side wall / 2 should put me in the center of each axel. So I subtract 18.25 (center of the rear axel) from 360 gives me 341.75. Then I do the same in the front and get 323.5. Subtract 6" from the outside diameter of the front tire to the front bumper and get 317.5. I will check by measuring it but thought that would put me in the ballpark.
     
  7. Superhauler

    Superhauler TEACHER OF MEN

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    100,712
    Jan 30, 2010
    keep stroking.
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    center of steer to center of drive axle suspension. (in other words between the drive axles)
     
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  8. Superwav

    Superwav Bobtail Member

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    Jan 27, 2012
    Monmouth, OR
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    Superhauler and Haulhand are absolutely right!

    I don't know why, but I was thinking your 359 was a single screw. That would be axle to axle.
    You need centerline (center of the hubcap) of the steer axle, to the mid-point between the two rear axles.

    Also, could you maybe throw up a couple af photos?
     
  9. vinijackson

    vinijackson Bobtail Member

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    Sep 11, 2011
    Williston Vermont
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    Sure I can take some more... The truck in my avatar is the one I'm talking of.
     
  10. ROBERTCADAMS

    ROBERTCADAMS Light Load Member

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    Sep 23, 2013
    Crossville,TN
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    You have a 359 Flat dash,Before the Dash of Class came about with a later model 379 Sleeper. The reason for the long wheelbase is it makes the truck ride better and once you get used to it there will be very few places you cant put it. Please keep pictures coming of your progress as I love 359's!!!
     
  11. 74pete359

    74pete359 Bobtail Member

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    Jan 22, 2014
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    I have a 74 359 st flat dash its a dump trk now with a 1674 270 hp cat . it has a fibreglass hood iwas told it is 4-5 inches shorter but not sure. Im trying to figure out the difference between a 359 an a 359st if someone could tell me
     
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