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Chevy Silverado and GMC Sierra 4x4 Questions



  • My GMC is shifting itself into 4 wheel low and wont shift out. Its push button 4wd. If I shut the truck off for 10 minutes and restart it, it goes back into 2wd by itself. I talked to a local mechanic and he had no ideas other than to pull the fuse so it wont shift. This has been fine for the summer but winter is coming and I'd like to get this fixed. Any ideas?
  • I've got an 04' Sierra 4x4. Here's my problem. Sometimes upon starting the truck the lights on the dash for the push button 4-wheel drive will say it's in 4-low. It's not. It also won't switch out of the faulty light by pushing the other 2-hi or 4-hi buttons. Sometimes when it says it's in 4-lo, it will actually drive in the 4-lo gear range but it won't be in 4-wheel drive. On the days when you start it and it says it's in 2-hi, you can push the buttons and it will switch to either 4-hi or 4-lo with no problems. Also sometimes the red light is on in the panel between the buttons. Do i have a bad actuator or bad dash switch or something else?? HELP!!!
  • just bought a 05 silverado Z71 with about 71000 miles. i was wondering why/if its suppose to make a clunking noise when shifting in to 4lo? its my first truck.
  • tafidtafid Posts: 12
    I have a Silverado 1500 4X2. There are LT245 70R 17 tire on it. Max pressure is 60 psi. The message board says check tire pressure. Question is can you run at recommended pressure (about 35 psi) under normal running (no load), but inflate to higher pressure when loading heavy cargo?

  • obyoneobyone Posts: 8,054
    that is exactly what you should be doing.
  • tafidtafid Posts: 12
    Thanks, but the lower psi is 45 psi for LT tires. My door label wants the Silverado LT 1500 to run 'P' not 'LT' tires. This says it will be 35 psi max, which is where I should be.
    My lesson learned, do more homework before buying.

  • obyoneobyone Posts: 8,054
    The P or passenger tire like the Michelin LTX M/S has a max psi of 35#. Being a passenger tire 30-35# will give you the best ride. However, running LT tires which are designed to be installed on the 2500 and 3500HD with more belts and a stiffer sidewall should have no problem running at 38-40# with no load on a half ton truck. I can imagine your ride at 45 psi.
  • Facts:
    *There is a Growl/Grind coming from the front driver side as far as I can tell.
    *Noise is present during deceleration 30mph and under.
    *Noise can not be heard during acceleration.
    *Noise exists while coasting in neutral as well.
    *There are no visible leaks anywhere?
    *Noise is amplified while turning.
    *Noise goes away after shifting back into 2WD.
    *There seems to be no issues shifting into and out of 4WD Hi or Lo.
    *Tire wear is consistent and even.
    *Front inside brake pads are not engaging rotor on either front wheel.

    *Changed out front differential gear oil. Drained a purplish, thick oil w/ what looked like metal flakes/sparkles. Magnetic drain plug had a few small splinters. (<1/8")
    Refilled w/ Valvoline 80W90 Synthetic Gear Oil - Noise still there.

    *Local performance shop seems to think it might be a wheel/hub bearing assy. If a bearing, would the noise be consistent during accel and decel in 2WD or 4WD? So I have my doubts about this being the issue.

    *Does the front differential disengage during decel or is it engaged all the time in 4WD?
    *If it does disengage, what controls this? Front Axle Shift Motor?
    *What do I look for to tell if it is a CV Joint?
    *Any suggsestions or help is appreciated!!!
  • I to am having this exact same problem. I took mine to a shop and they told me it was the clutches in the transfer case. As for the CV joints i dont think it would be those because you would still hear them no matter what. If you find anything out let me know.
  • I think it is the cluches in the transfer case, I just rebuild the transfer case and notice just today the growling were as before I rebuilt it and the 4wd was not working you did not hear the noise.
  • So that fixed it then you hear no more growling in it or do you? how much did it cost you to rebuild it?
  • Can you let us know what was wrong with your 4WD? I have same problem with 2000 silverado. Driving in woods a stick lodged under truck near transfer case and now 4wd HI won't work. Only 2Hi and 4Low work. Thanks.
  • Still have the growling, I think its part of the design?

    The cost, $175 timing chain, 10 cluch disc apx $3.00 each, Anitrobic gaskit sealer $17.00, 3 quarts Gm Trans fluid $24, 3 shaft seal $15 apx ? can't remember the exact price. and 8 hrs labor, first time rebuilding the transfer case.

    One thing I have not check out, it appeared to me there was a adjusting screw for the cluch plates. Only two of the clutch plates were fried the other eight still looked good. The point being I think maybe I could have adjusted it and it would have been good for another 20-40k miles.

    I put apx 80-100 hrs a year on it plowing every year so it has held up good.
  • rudyrudy Posts: 1
    I was shopping for a new Silverado 1500. The dealer said he had a new 2007 Silverado 2500 which had been "lost "in his Inventory which had an MSRP of $30,000 that he would sell for $20,000. When I checked on Edmunds I found 2 other dealers with similar deals on the 2007 model. Does anyone know whats up.? Other then gas mileage do you think the the 2007 2500 is better than the new 2008-9 1500?
  • Okay, in 2002 I got a deal on a resale 1999 K2500 4x4 Silverado with extended warranty. From reading the dialog on this forum I am convinced that there is a factory defect in the 4x4 system and have paid over $1000 to fix the push button panel and actuator. I am having the same symptom on the 4x4 plus others. I have written GM customer service and they can do nothing. I then wrote the Pres. of GM North American and he ignored 2 letters, not even a form letter reply.

    Shop for customer service and support. I would pass on giving GM one cent.

    Good Luck.
  • I am having my front diff checked out I think its the carrier bearings on the front diff i will let you know on weds.
  • obyoneobyone Posts: 8,054
    There hasn't been much change since the introduction in 2007. I've seen the same deal you're talking about on a 2008 left over 2500. That being the case, I'd opt for the 2008 if you can find one as the 2007 would be considered 2 years old next month.
  • when the truck is in 4wd and you turn the wheel left or right is sounds like the front end is going to fall off and you have to hit the gas feels like something is also binding up
  • obyoneobyone Posts: 8,054
    When was the last time you checked the level of the power steering fluid and replaced the dextron III in the transfer case?
  • I had my wheel bearings replaced last year, still have the noise.

    When you say carrier bearing your refering bearing that are in the front differental housing?
  • Yeah having it checked out tomorrow let you know when i find something out im hopeing that that is it its starting to make noise when its in 2 wheel drive
  • I had the same problem with switching onto and out of 4wd. The easiest way to get it to change is to shift into neutral while you are rolling, and then shift to high/low 4wd. 5-10 mph for 4hi and 2 - 3 mph for 4 low.
  • I have a 2001 Silverado 1500 LS. Today it shifted into 4lo and now it will not shift out. I have noticed alot of grease around the boot on the drivers side. I need help. Anyone out there know what I can do to get it back into 2wd? I am desperate....please help me
  • Hi, did you find an answer for your question? I have a 99 new body style and my front end does not seem to disengage fully causing hard steering when making u-turns.
  • I was interested in the answer to your question. Did you find out?
  • i have 2000 silverado 1500 ls with same problem. i can't get any lights to flash, only 4lo. if you find a fix please let me know. it's not the switch because i took it out and it shifts my dads 2004. thanks for any help and good luck
  • i have 2000 1500 z71 with same problem. i fixed it with a new tranfer case shift motor and new tranfer case encoder.
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