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Friends truck "grinding" when accelerating fast...

Discussion in 'Chevy Trucks' started by mkwl, Nov 27, 2007.

  1. mkwl

    mkwl 2000 Club Member
    Messages: 2,361

    I was riding in a friend of mine's truck from school today (uncle was borrowing my truck). He has a 2004 Chevy 2500HD 6.0L auto trans. When we were pulling out of thte lot up a steep"ish" hill, his truck accelerated fine, but made a sort of "grinding" you could feel when he first accelerated- I have no idea what it was, just wondering though- he had no idea either, said it had been doing it for about two or so months. I'm guessing it was something trans related, not sure though, because it didn't seem to always do it- just sometimes :dizzy: Anyone have any idea what it could be?
     
  2. streetsurfin'

    streetsurfin' Senior Member
    Messages: 770

    The fan hitting the shroud because of a broken motor mount?
     
  3. flashinglight

    flashinglight Junior Member
    from maine
    Messages: 25

    My buddies GMC 2500HD 2003 6.0 truck made a griding vibration when he turned sharp, turned out to be the rear end, had 90,000 miles, he changed the rear end fluid and it hasn't done it since.
     
  4. mkwl

    mkwl 2000 Club Member
    Messages: 2,361

    You can like feel the vibration slightly in the floorboards- I'm guessing it's not a slipping trans then?
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Does it only do it in a turn or will it make the noise when accelerating in a straight line also?
     
  6. Earthscapes

    Earthscapes Senior Member
    from WNY
    Messages: 577

    On my 04' I had a straight line grind/rattle noise. Drove me and dealer nuts for 3 months. Wouldn't do it all the time, but when it did you thought the thing was gunna explode. It ended up being the inside of the muffler came apart. They ended up replacing the whole exhaust system, under warranty at the time.
     
  7. streetsurfin'

    streetsurfin' Senior Member
    Messages: 770

    Did he check the trans fluid? A low fluid level could cause a shudder in the trans, I think.
     
  8. mkwl

    mkwl 2000 Club Member
    Messages: 2,361

    Seems like it's only when making a turn, then accelerating up a hill at the same time or soon after turning- not totally sure though, only did it in a turn when I as with him.
     
  9. streetsurfin'

    streetsurfin' Senior Member
    Messages: 770

    Are these stock tires or oversized? It could even be something as simple as an oversized tire rubbing on a mudflap at full lock. Turning and uphill would indicate compression of one side of the suspension at near full lock. Have him go through full left to right steer qhile parked, and you be outside of the truck looking at clearances. Account for compression of the suspension and see if anything is close to rubbing.
     
  10. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If it only does it in a turn I'd bet it has a GovLoc (locking differential) in it then, right?

    If so, then it's not uncommon for them to do that when the fluid in the rear end breaks down. The clutches in the Gov Loc's will stick and chatter if the fluid is either low or broken down.