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

Tiny
CHEWY106
  • MEMBER
  • 2006 CHEVROLET SILVERADO
  • 165,000 MILES
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
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Saturday, February 4th, 2012 AT 9:39 PM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
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.
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Saturday, February 4th, 2012 AT 9:57 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
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.
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Saturday, February 4th, 2012 AT 10:02 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Cadieman, I'm fat and I can slide under my dad's Silverado without a rack. Just a piece of cardboard.
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Saturday, February 4th, 2012 AT 10:16 PM

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