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Problems with new truck

Discussion in 'Chevy Trucks' started by AFM Contracting, Dec 5, 2006.

  1. AFM Contracting

    AFM Contracting Member
    Messages: 92

    We got some snow last night so I went for a drive and decided to try out the 4x4, It felt like it was slipping and the front end of the truck was bouncing around. My mechanic said it was because of the tires, 3 are the stock LT245/75-16 and the front passenger side is 235/85-16. He also says that was why my ABS controler kept kicking in. Anyone have any opinions?
     
  2. Mick

    Mick PlowSite.com Veteran
    from Maine
    Messages: 5,546

    Only one - get another LT245/75-16 -- now.
     
  3. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    Certainly a good place to start. The ABS sensors work on wheel motion relative to the others and cen get messed up when you have different size tires on. Not if you change your tires size, just if you have mismatched tires.

    Go get another tire right away.
     
  4. DBL

    DBL PlowSite.com Addict
    Messages: 1,310

    check the transfer case make sure the fluid is good and the tire like mick said
     
  5. AFM Contracting

    AFM Contracting Member
    Messages: 92

    I already ordered 2, there going on the truck tomorrow, just thought you guys might have some other opinions.
     
  6. john95chevy

    john95chevy Junior Member
    Messages: 22

    i dont think that would make that much of a difference seeing that a 245/75/16 is very close to a 235/80/16

    235 divided by 80 is 2.9375 which is the height of the sidewall times 2 plus the size of the rim

    so 2.9375 times 2 = 5.875 + 16 = 21.875 hieght of tire

    now for now for 245/75/16

    245/80 = 3.26 times 2 = 6.52 + 16 =22.52

    a difference of 5/8 of an inch a tire with low air pressure has more difference than that

    and even if it did cause a problem it would more than likely be with the differentials not the transfer case

    just my 2 cents
     
  7. Antnee77

    Antnee77 PlowSite.com Addict
    from RI
    Messages: 1,056

    It's not the tire size, it's the type of tire. 245's are just fine in the snow, but not the crappy stock Firestones, and not a highway tire. What kind of tires are on there?
     
  8. jay723

    jay723 Member
    from SE CT
    Messages: 30

    The 235 is one inch taller, which relates to 3.14 more inches of travel compared to the other side. Nothing else is wrong, change your tire before you brake something.
     
  9. Brian Young

    Brian Young PlowSite Veteran
    Messages: 3,382

    IDENTICAL tire sizes are a must on 4x4's
     
  10. oakvillerex

    oakvillerex Member
    Messages: 65

    if your abs is still doing weird stuff it is probably rust and junk buildup between the sensor and the exciter ring, pull the sensor out if you can determine which one it is with a scan tool and clean all around it, but be very careful when pulling the sensor that you don't break it.

    But put a tire on that truck asap you have to run the same size tires on both axles when you have a 4x4




    Jeff
     
  11. jonzer12

    jonzer12 Member
    from Canada
    Messages: 31


    Quite correct, you can't run different size tires on a 4x4, expecially if you a LSD or a locker.
     
  12. Yaz

    Yaz PlowSite.com Addict
    from NH
    Messages: 1,061

    Are you guys reading his post? First off I 100% agree the tires should be the same size.

    But his complaint is not how his breaks function, it's was when he put it in four wheel drive.I would think if the truck is on dry pavement and it hops up and down, turning tight that's normal. I bet you that it would it would be even worse with odd size tires.

    Just a warning any old 4x4 with different tires and has been run that way is bound to have more wear in that differential and most likely some other maintenance issues.
     
  13. AFM Contracting

    AFM Contracting Member
    Messages: 92

    Thanks guys, you have been a hell of alot of help, i put new tires on today. the abs controler seems to be ok, i dont have a clue where the sensor is so unless it is really simple to find im gonna leave it alone. i didnt try the 4x4 yet but i will and let you guys know. Thanks for all the help.
     
  14. Nascar Fan

    Nascar Fan Senior Member
    Messages: 167

    Hope it works out for you as I am willing to bet that it is just the tire.Dont forget that 1 tire no matter how much different in size will affect abs and turning.ABS sensors are independent of on another tied to a central computer.With tire sizes having different diameters they are going to rotate at different at different speeds thelling the computer different things.
     
  15. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    Yes, we did read his original post.

    He was having brake problems too.
     
  16. Bruce'sEx

    Bruce'sEx Senior Member
    Messages: 873

    I know and it's happened to two of our trucks now, but a speed sensor in the front driver side hub, have a habbit fo going. The way you know it's either a bad wire, or the sensor has come lose a bit and rubbing on some metal in there and needs to be replaced it when you are near a crawl and on the brakes you'll feel the abs kick in for that last second or two of braking.
     
  17. oakvillerex

    oakvillerex Member
    Messages: 65

    quote from Bruce
    know and it's happened to two of our trucks now, but a speed sensor in the front driver side hub, have a habbit fo going. The way you know it's either a bad wire, or the sensor has come lose a bit and rubbing on some metal in there and needs to be replaced it when you are near a crawl and on the brakes you'll feel the abs kick in for that last second or two of braking



    You can usually fix that by cleaning the sensor and all the metal and crap around it, even brake dust if you run your brakes down to metal on metal will accumulate in behind the sensor and throw things off

    by the way glad to hear you got everything sorted out just by putting a pair of tires on the truck
     
  18. AFM Contracting

    AFM Contracting Member
    Messages: 92

    where do i find these sensors so i can clean them up, because im willing to bet that the sensors are filled with crud. and what do i use to clean them thanks
     
  19. jcesar

    jcesar Senior Member
    from Mi
    Messages: 492

    Never run odd tires on a 4x4. Always the same size. As for the abs, the tires could throw it off, as previously said, due to the fact that the sensors ARE on the wheel assembly.