"Bump-bump-bump" drive-line noise.

Tommy WFMC

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New here, I didn't see a place for introductions....name's Tommy and I just traded a family member out of an '06 V6 with a few minor problems. Most of which I've already taken care of.

This one has my pulling my hair out..
It's a "bump-bump-bump" coming from what I think is the differential, it sounds like a tire is going over a small speed bump every 15 feet. It's perfectly timed. It does not get louder or softer, it does not change in a turn, it's constant and directly related to the speed of the car.
I was hoping it was a tire, however by marking a tire and watching with a mirror held out the window as I drove, the bumps are not every tire rotation, but every 2 1/2 or 3 tire rotations. Which causes me to believe it's not a wheel bearing, bent axle, or damaged ring gear.
And It's way to slow to be in time with the rotation of the drive shaft, (it bumps once for every nine or ten rotations of that), so I don't think its a carrier bearing, U-joint, or the pinion gear/bearing.
Tomorrow, I'll top off the oil level in the differential. If that changes nothing I guess I'll pull the cover and check out the guts in the pumpkin.
 

Torkair

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Check to see if one of the balance weights has come off the drive shaft, while under there you can also check to see if there is any play in the u-joints.
 

Tommy WFMC

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Never mind. Thanks I found it by myself.
Thanks for trying to help, Torkair.
 

Tommy WFMC

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Sorry Torkair, I just now saw this.
I was laying in bed trying to think of what particular part on that car would bump every third or fourth rotation of the tire. While seeing in my head how the wheel bearing works, I saw the rollers rotating around between the axle and the race. They make the circuit about every three or four rotations of the axle shaft.
I pulled the axle and found one of the roller bearings had split in two lengthwise and half of it had fallen out of the race.
Every time that void came around the axle and got to the top, the axle would bump.
I replaced all four wheel bearings. One of the fronts was dry and the other was loose.
It quieted down a LOT!
 

Torkair

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Glad you caught it before they completely gave out on you!
 

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