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  1. #1

    Exclamation intermittent scraping from tranny

    I have a 2000 Silverado with automatic trans that has a scraping/grinding noise coming from the rear part of the transmission. I raised the rear wheels and put it through all the gears. The noise appeared to be comong from the drive shaft, so I dropped the shaft and ran it through the gears again. There is a faint grinding noise that occurs at low rpm and goes away as the rpm increases. I then reinstalled the drive shaft (thinking that I need a new tranny). After that, I test drove it and the noise is completely gone! This happened last year for only a few minutes and went away until now. Once again, the noise is gone. Can anyone tell me what could be causing this?

  2. #2

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    Maybe a U-joint that is starting to bind up? When you dropped the shaft it may have taken enough load off of it to "un-bind" it. Just a guess.
    Scott

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  3. #3

    Default

    I would say to check your U-joint. But how's your Tranny Fluid?

  4. #4

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    Where it sounds from your original post like you could hear the noise (probably a lot less pronounced), I would also be inspecting the tailshaft/output shaft bearing on the transmission (if 2wd) or transfer case (if 4wd).
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
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    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  5. #5

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    The grinding sound was there without the driveshaft installed, eliminating the u-joints. I suspect that what ever it is resonates through the hollow driveshaft and amplifies the noise. I took the truck out again today. The heaviest noise is present in first and reverse, slightly less in second and not there at all in drive, although, if I start off in second and let it shift to third when I put it into Drive, It is quiet except for a slight roaring sound. When I took the driveshaft out yesterday, I checked the spline for lubrication & it looked fine. It shifts fine through all gears-just sounds terrible. I don't know enough about automatic trans to take any guesses on if this noise can be fixed by changing the fluid and filter or is it likely too late?
    Last edited by jchutchinson; 02-15-2009 at 12:47 PM. Reason: more info

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