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pm26

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Everything posted by pm26

  1. pm26
    I wish some tuner would come up with a simple fix for this. Let's face it, who here with vibration issues would not sacrifice 2 MPG to have a great running vibration free truck?
  2. pm26
    No, it is the net effect of cutting corners in too many places.
  3. pm26
    It looks like those who have problems with their seats need to go on a diet.
  4. pm26
    I thought it was the annoyance style. I guess GM has found out that loading a seat with gizmos is not a substitute for the seat itself.
  5. pm26
    Believe it or not, but every one of my current GM vehicles came with good quality OEM tires. Silverado Z71 4x4 with Bridgestone Duellers, Impala LTZ with Goodyear Eagle RSAs, and Sonic LT with Hankook Optimo tires. No problems whatsoever with any of these and definitely no vibration issues. Why GM chose to put crappy tires on some 2014 trucks is a mystery to me. Maybe a bad batch of tires that should have been rejected by quality control were shipped to them?
  6. pm26
    You know what the most irritating thing about this is? That someone at GM who suggested this "cost saving measure" most likely got a fat check as a reward. Instead of employing an Army of people to improve quality, GM chooses to employ one to cut costs and to maximize profits. And richly rewards the suggestions that are implemented.
  7. pm26
    Must you ask? A: What vibration?
  8. pm26
    And I bet that the reason is that the frames are wax coated over improperly prepared surface, possibly even surface rust. Apparently they either do not paint the frames at all when they make them, or paint them poorly so some surface rust sets in before they are wax coated. My 1985 Mercedes 300D still has perfect looking chassis with factory applied RTV that is still not peeling after almost 30 years!
  9. pm26
    This seat issue is still unresolved?
  10. pm26
    They make sure the bloated stickers are properly affixed to the window glass.
  11. pm26
    Just for a second I thought you meant "canned tuna".
  12. pm26
    Merged?
  13. pm26
    I have seen problems with tires that had a loose steel belt. The longer you drove and the warmer it was outside, the hotter the tires got and the worse the vibration got. So yes, there could be a correlation here between ambient temperature, length and speed of driving, and vibration.
  14. pm26
    I wonder if on some of these axle assemblies the pinion shaft nut was properly torqued to cause the collapsible spacer to deform and preload the pinion shaft bearings correctly. In my experience, improper backlash setting in between the pinion and ring gears usually results in whining noise around 40-50 MPH, either when gears are loaded or unloaded (when coasting). It can also cause clunking in extreme cases when shifting between forward and reverse. It is hard to imagine the gear backlash out of adjustment so bad that it would cause vibration unless there is something else out of spec too. I wonder if that collapsible spacer has been left out by accident on some axles? Perhaps some axle housings are not straight causing severe misalignment of gears? http://www.differentials.com/technical-help/installation-instructions
  15. pm26
    I am sure that all the people here who have problems with their GM trucks will appreciate your keen insight into quality issues and suddenly realize that they have been wrong all along - that in fact they are imagining all of their problems!.
  16. pm26
    I have a hunch that even much cheaper brake rotors that are properly balanced would have fixed that problem. What is happening is truly hard to swallow. Companies are exporting manufacturing of parts overseas and quality control inevitably suffers. I am certain that the American Axle Co. has exported manufacturing and assembly of axles for these trucks to some third world country or simply deleted a lot of former quality control checks, or both. You put a poorly trained worker on something like axle assembly line and he will screw up several hundred assemblies before he learns what he did wrong, because evidently they do not bother to do certain quality checks to ensure proper assembly in China, Mexico, India, or wherever they make them. And someone is bound to have that poorly assembled out of spec axle assembly installed on their truck! Or poorly balanced or improperly welded drive shaft. Or badly balanced brake rotors or drums. Or a poorly assembled transmission or transfer case. Welcome to globalization. Screwing the customer and US worker alike since its inception.
  17. pm26
    This is why I like manual transmissions. I currently have one in the 2013 Chevy Sonic. Although I have no complaints about the 4 speed auto transmission behavior either in my Silverado or Impala LTZ. Impala especially is very quick to downshift when you push on the gas pedal even slightly. Silverado requires slightly heavier throttle to downshift but then the non-AFM 5.3 has a lot more torque than the 3.9 liter V6 in my Impala so it can run at lower RPMs in the fourth gear without feeling too strained. I believe that GM in their effort to maximize the fuel economy has pushed things too far on these new trucks and maybe some aftermarket tuning can fix it? We have a 2012 Silverado crew cab 4X4 with the 5.3 AFM engine/6 speed auto at work and I do not find any issues with the transmission shifting. I cannot tell when it is switching between 4 and 8 cylinders either.
  18. pm26
    Then why is everybody on here referring to the truck they just bought as "my truck"? Is it paid off? If not, it is not your truck. It is a bank's truck until it is paid off.
  19. pm26
    And if it does not?
  20. pm26
    Would 11.00/R20s be too big?
  21. pm26
    I hope that GM gets their act together by 2015 model year.
  22. pm26
    I bet GM knows exactly where the problem is. It is a combination of cheap parts, crappy assembly and lack of quality control. Whereas some vibration problems may be caused directly by marginal tires, others are caused by improperly assembled transmissions, rear axle assemblies, badly balanced or welded driveshafts, and in some cases combination of all of those. If you let the quality go for the sake of profits, the recovery will be very painful. I came to this conclusion after reading all these posts - it seems that dealers are desperately trying to replace parts that were proven to be defective on some other truck as a potential fix. there appears to be no single source of these problems, although the largest number of complaints can probably be solved with good tires.
  23. pm26
    Yesterday I looked at a new 2015 HD2500 Silverado with Duramax/ Allison. It was a crew cab 4x4 version, standard bed, LTZ trim. The sticker price was just under $ 61k. I paid $ 58k for my first house in 1988. Brand new 3 bedroom, 2 car garage house on a 1/3 acre fenced lot in San Antonio, TX.
  24. pm26
    It looks like it was a bad workmanship issue in your case. It seems that some of these seat issues are design related, but not all of them.
  25. pm26
    A tire blowout can be very hazardous. I had one on my old '82 Pontiac Bonneville years ago. it was a cheap General tire, almost brand new, and it blew right through the sidewall without any apparent reason at 70 MPH. Fortunately it was a rear tire, but still I lost control of the car temporarily and it drifted across two lanes on I 95. I was lucky that nobody was next to me. I have stayed away from cheap tires since that day and never experienced a similar blowout again. It sounds like your dealership is replacing parts at random hoping one of them will fix your vibration problem. Not a good approach, with marginal probability of success. They should be able to inspect the rear end, measure gear backlash, take out the axle shafts and carefully inspect them for straightness, check the contact pattern on the gear teeth, check the axle bearings for proper installation and smoothness of rotation, etc. A drive shaft is also rather easy to inspect for any problems and it can be checked for maximum permissible lateral runout and proper balance on a special balancing machine.
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