Question about 2003 GMC Sierra 1500

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My 2003 GMC sierra has a clunk. It happns when I am coasting, say while turning or slowing in traffic then I exelerate about 50 - 75% of the time I get a singe clunk. It seems it occurse most when it is inbetween gears. I replaced U-joints and have been told it could be EITHER the differential OR the transfer case. They can not tell me which one. Any Ideas?

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Hi, without driving it to experince the noise first hand i would tend to say its the rear diff. Other causes can be a broken engine or transmission mount. Good luck

Posted on Aug 27, 2010

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If you have that much play back there, first check rear universal . If play is present in pinion with shaft removed, you will not be happy with what you find inside the cover.1/2 turn of lash in any gearset is far beyond the scope of any adjustment. Rebuilding is an exact science and must be done with special tools and lots of experience.
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