1994 Chevy Astro Bucking/Knocking SOUND decelerating downhi

1994 CHEVROLET ASTRO
225,000 MILES • 6 CYL • AWD • AUTOMATIC
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NITSAN-PARACH
  • MEMBER
  • 2 POSTS
Recentlly began experiencing a bucking/knockiing sound when decelerating on downhill side of incline in road at or above 50 mph, but then it began happening at 45, and sometimes now at lessor mph.

I must make it clear that it is really just a loud sound at this point, and that all transmission related functions (exceleration and deceleration, automatic up and down shifting, etc.) seem as normal for this van and the identical make, year, and model van I owned previously.

Thank you.
Jun 14, 2010 at 3:13 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Haveyou checked u-joints? Also, is the sound coming from under the vehicle?
Jul 19, 2010 at 11:10 PM
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