Rough Ride on 09

Discussion in 'Lifted & Offroad Suspension' started by KRAZYKARL, Feb 24, 2011.


    KRAZYKARL New Member

    09 Silverado 4x4 Z71 ready lift 2.25” on front 3” block on back
    I have had my leveling kit on for a while and it was the same ride as before smooth as a Cadillac. I put new Toyo M/T LT275/70R18 125P E/10 (33X11.00R18) now its a rough ride and the rear feels like it bounces. Any input on this?
  2. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    What air pressure in tires???
  3. adampaul1964

    adampaul1964 Epic Member 5+ Years ROTM Winner 1000 Posts

    X2, air pressure, if pressure's within spec then it's because you've switched from a smooth riding highway tire (stock) to a bone crunching aggressive LT mud tire.
  4. ajarman

    ajarman Epic Member 5+ Years ROTM Winner 1000 Posts

    I have almost the same setup as you on my 2008 but I have the 2" blocks in the rear. I did notice a slight harsher ride once I went to a M/T tire, but by no means is it a bad riding truck. I did get a little better ride once I dropped from 50psi down to 37psi.
  5. mfleetwood

    mfleetwood Epic Member 5+ Years ROTM Winner 5000 Posts

    Hey, you're like me now running between 35 and 40 psi. Not sure what the long term wear effect will be, but the ride is much better than with 50psi
  6. stephan

    stephan Rockstar 4 Years 5000 Posts

    Karl, It could also be a change in sidewall rating. Did you go from "C"s to "D"s, or "D"s to "E"s?
  7. ajarman

    ajarman Epic Member 5+ Years ROTM Winner 1000 Posts

    Much better ride for sure, but I am sure it will have some kind of effect on the wear.
  8. mfleetwood

    mfleetwood Epic Member 5+ Years ROTM Winner 5000 Posts

    Stephan...I heard you were partial to the Double Ds
  9. stephan

    stephan Rockstar 4 Years 5000 Posts


    Actually Mike, in the vein that you're alluding to, the "D"s are a softer ride ha ha ha
  10. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    there are a few things that were said to agree with. the new tires are a MT in an E rating. What was it before C or D. if C you will definately notice a difference there as well as going from a highway tire to a mt. Also on the PSI, unless you are always running fully loaded dont run max psi. will give you a stiffer ride and you will wear the middles due to overinflation. there are ways to figure it out by weighing the front and then weighing the rear, doing some calculations blah blah blah to give you a good psi. One easy way to do it is to grab some chalk and color a nice strip across the tread (an inch or so wide) drive down the street and see if there is chalk left behind in the middle or edges or all gone. if chalk is left in middle and not edges than tire is under inflated. if chalk is gone in middle and left on edges its under inflated. With my 315/75/16 D's have a max psi of 50 (on a 33 E tire may be 65 psi, I know that is what an E is on the 35's. Stock size E's are 80). I run 38 up front and 35 in the rear. I kinda do the opposite since I have a gravel driveway. when I get out I look to see where the gravel dust is on the tires. also once you get close then measure the distance from the ground to the center of the hub. should be about the same height. On mine I could probably put a little more pressure in the front to make the front and rear the same height. obviously unloaded the rears will have less weight on them than the front which is why I run more pressure up front. Running a tire at full psi cold is good if running loaded which is why even with the 80 psi stock E tire (for my truck) the fronts are at 60 and rears are at 80 according to the sticker on the door, cuz thats where the heavier weight is. all based on weight on the tires for correct psi moreso than what is listed on the side of the tires. that is just a pressure when carrying the max load.
    Last edited: Feb 24, 2011

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