clunk when shifting into reverse

Discussion in 'GM Powertrain' started by newcheylover, Feb 3, 2013.

  1. newcheylover

    newcheylover Member 1 Year

    I have an 01 Silverado LS 1500 4X4 with the 5.3L and 4l80e combination. Every time I shift it into reverse it makes a clunking noise. I replaced the u joints on the front drive shaft because there was some play. No difference. Rear drive shaft is fine. I do have quite a bit of play in the rear end but I watched under the truck as a friend shifted it back and forth there was no movement. Any ideas?
    Thanks in advance!
     
    Last edited: Feb 3, 2013
  2. a.graham52

    a.graham52 Rockstar 100 Posts

    the noise you describe is quite common on these trucks especially with higher millage. however without hearing the noise its hard to say if its an abnormal noise or not. make sure all your fluids are at proper level (diff(s) and transfer-case), and if its a quiet clunk then i wouldnt worry too much about it.

    possible causes include but arnt limited to the transfer case chain taking up slack and play in the diff as you already know. chances are good that the noise is not an indicator of immediate failure. if it ends up being gear lash in the rear diff due to wear, your only going to be able to fix it by replacing the ring and pinion which probably you would rather deal with the noise then the cost of replacement. if the transfercase is making the noise and you DONT hear chain slap going down the road then i wont worry about that either. just my opinion.

    see if the noise changes in 4wd and 2wd and like i said, also check your fluid levels.
     
  3. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Also check the slip joint in the rear driveshaft, if it isn't properly lubricated it'll make a rather loud clunk.
    There was a TSB out for certain year trucks a while back to get rid of clunking in the driveshaft, they replaced the slip-joint with one that if I remember had a higher nickle content in the metal.
    Most times you can lessen the clunk by pumping grease into the zerk fitting until it starts oozing out the slip-joint seal.
     
  4. newcheylover

    newcheylover Member 1 Year

    I guess its more of a squeaky clunk if that makes sense. Is there any way to not have the grease spray every were after you regrease it? I always wipe everything down as good as I can but it always sprays it all over the body and frame.
     

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