Numerous issues with my truck. Need a little assistance

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by texastito, Jun 25, 2012.

  1. texastito

    texastito New Member

    Thanks everybody for the replies.

    Looks like the first thing I need to do is what my gut feeling said - fix the exhaust 1st.

    Gears - I'm not sure how to look up the codes to find the gear ratio.

    Engine size - the sticker is wiped clean. No information is legible. I just assumed it was the 5.3 by the severe lack of power.

    As for my driving habits - I'm getting 13-14 MPG's..... I drive pretty dang conservative, lol. I would hate to see it if I were heavy footed!

    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    If you go to the Link below, and Enter your Trucks Vin# Number, it will show you what the Truck Came with from the Factory, from What Engine....Transmission....and Gears, to the Color of the Interior,

  3. texastito

    texastito New Member

    Cool, thanks for that. Found out the following interesting info:

    Gears - 3.73
    Engine - 5.3L
    Tires/Wheel - 265/65/18 - 18x8aluminum
    PKG - 1LZ; 1SZ

    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    Do you know, if the owner had the Speedometer Re-Calibrated, for the Change in Tire Size, the reason I ask is, the 265/65/18's that came with the Truck, have an Overall Diameter of 31.5ins'.......and your Tires now, have an Overall Diameter of 33ins" Correct??.....if he didn't and because of this Difference in the 2 tire sizes, not only is your Speedometer off, but also the Odometer, so your not getting a Correct Fuel Mileage Reading.
    Last edited: Jun 26, 2012
  5. aloxdaddy99

    aloxdaddy99 Epic Member 5+ Years 1000 Posts

    Many shops that swap gears either stamp the new gear ratio into the pumpkin or use one of the diff cover bolts to hold a tag with the new ratio. Yes I know not all shops do this but you may find one. I would do as your gut and many others have said and correct the exhuast first.
    An easy and free thing that may surprise you as 99heartbeat pointed out you may be getting better mileage than you thought. Have a friend ride next to you on the highway and check your speedo against their speedo, or if you have a GPS that gives the speed compare the two.
  6. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    I should of stayed out of the discussion, hahaha, I provided wheel info from the Avalanche. I just looked up the Siverado LTZ, and the standard wheels are 18". The 20" wheels are options..........SORRY....
  7. texastito

    texastito New Member

    Still haven't corrected the exhaust yet (low on funds to have it "corrected"). I will at least cut off the capped side soon to see how the performance changes. Ill have to start another thread asking about exhaust systems.

    I DL'd a speedometer app on my phone that's supposed to be fairly accurate (uses GPS). This morning I was going 70mph, and the app read 71-73. Either way, if the truck speedo was off, it'd be the opposite way..
  8. TimTom64b

    TimTom64b Epic Member 5+ Years 500 Posts ROTM Winner

    I would get that capped off side opened up right away... it is going to make a big difference. I am surprised it doesnt overheat... it should run similar as if the cat being plugged. It will be loud inside without the tailpipe but will be worth the hp and mileage being restored. :)
  9. 06MonteSS

    06MonteSS Rockstar 100 Posts

    LIKE your truck man!! that's nice, tough lookin'... ^ ^ ^ ^ ;)
  10. texastito

    texastito New Member

    Finally removed the cap from the outlet. Whoa! The performance was noticed IMMEDIATELY! Quicker response and not bogged down! Felt like a new truck.

    No accurate MPG test yet, but travelling across Houston I got 15.9mpg, which is Freakin outstanding!!!! Previously it would have been right at about 13.5mpg.

    Definitely a large tonal difference as well. Deeper and louder growl. Nice!

    Will update when I get a more accurate MPG reading from my trip this wknd.

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