why would it clunk when taking off and be rough shifting from first to second

2006 CHEVROLET SILVERADO
165,000 MILES
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CHEWY106
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as i am taking off i am rolling give is gas and it clunks, almost like the drive shaft rolls back and then when its time to go it got some play in it so it clunks, not sure if its the u joints or tranny or what, also when rolling slowly and it shifts from ist to second it has a rough shift
Feb 4, 2012 at 9:39 PM
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RIVERMIKERAT
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Sounds more like a motor mount. You'll need a helper. Lift hood. Block front wheel. Engage parking brake. STAND on regular brake pedal (emergency/panic stop). Stand next to open hood, by front wheel. Helper in cab shifts into Drive and depresses accelerator to bring RPM up to 1500 and back to idle. Watch and listen. Do you hear the clunk? Did you see engine jump? Yes? Motor mount. No? Shut engine down and check u-joints for play.
Feb 4, 2012 at 9:57 PM
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CADIEMAN
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if you hear squeeking the u joints may need replacing.if u hear a clunk when shifting from rev. to drive.u will still need to get it on a rack to check the u joints and front end componits.
Feb 4, 2012 at 10:02 PM
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RIVERMIKERAT
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cadieman, I'm fat and I can slide under my dad's Silverado without a rack. Just a piece of cardboard.
Feb 4, 2012 at 10:16 PM
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