Thumping sound right rear or middle rear of truck

Tiny
SHOOTTHETRUCK
  • MEMBER
  • 1994 DODGE DAKOTA
  • 154,000 MILES
Pulled the right rear brake drum corrected the problem there, replaced with new hardware and bled, no more clanking or grinding sound, however still have thumping sound. Most prevelant after braking (not when braking) then thumping comes and goes. No thumping when accelerating or in reverse and at times not at all!
Wednesday, September 11th, 2013 AT 7:44 PM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 34,367 POSTS
Check for a loose spare tire.
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Wednesday, September 11th, 2013 AT 10:48 PM
Tiny
SHOOTTHETRUCK
  • MEMBER
  • 6 POSTS
The spare tire is not on the truck ! I checked that out yesterday, everything is secure underneath the truck bed.
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Thursday, September 12th, 2013 AT 7:24 AM
Tiny
CARADIODOC
  • MECHANIC
  • 34,367 POSTS
There is a tool you might be able to borrow or rent from an auto parts store that borrows them called the "Chassis Ear". It is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points, then drive around while listening with the headphones. You can move the microphones around to zero in on the source of the noise. Be aware that many mechanics have never seen or even heard of this tool. Suspension and alignment mechanics use it to find rattles, squeaks, and other noises.

Put one mic on the box itself. Seems to me there was a service bulletin for a flexing box or something with the cab or box mounting bolts. I don't remember the symptoms other than a noise, and I don't remember which year(s) that applied to but it was in the '90s.
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Thursday, September 12th, 2013 AT 10:50 AM
Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
Have your rear drums turned on a lathe. They maybe warped.
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Saturday, September 14th, 2013 AT 9:59 PM

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