Slight Grind

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Feb 19, 2008 | 10:19 AM

knecoli22

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Slight Grind

Truck Specs:
2003 F250 SD CC 7.3L 2WD
6" Pro Comp Lift

When feathering the throttle around 65 mph I get a slight grind/vibration. This "slight" noise gets much louder when I speed up to around 75, but typically only comes when coasting or slightly pressing the pedel. The noise disappears when I peg the throttle or brake.

I can also hear/feel the noise/vibration at lower speeds 35 - 60 mph when I slightly feather the gas pedel.

U joints on driveshaft have recently been replaced (which resolved other noise issues I was having).

I am trying to find the source of the problem before it gets much worse and possibly more costly to fix.

The noise/vibration appears to be in the front of the vehicle, and NOT travelling up the drive shaft from the rear diff.

Could it be a front wheel bearing?

Thanks in advance for any ideas!

Feb 19, 2008 | 10:27 AM

redford

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From: Stephensville WI

Do you feel this in the steering wheel, in the seat of your pants or just "all over"?

If it is in the front, my first impulse would be to check your front brakes.

Feb 19, 2008 | 10:36 AM

knecoli22

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It seems to be more on the floor and the seat than in the steering . . .

The brakes are relatively fresh, I changed them out on all four corners about 15,000 miles ago. I'm not ruling that out but it seems a little too "different" of a grind to be the brakes.

Feb 19, 2008 | 11:03 AM

redford

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From: Stephensville WI

If you feel it in the floor and the seat I don't think it is in your front end. I'd check your carrier bearing.

Feb 19, 2008 | 11:05 AM

knecoli22

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The carrier bearing, driveshaft, and rear end have all been rebuilt within the last 15,000 miles as well.

I replaced the U joints within the past 2,000 miles.

I'm really at a loss . . .

Feb 19, 2008 | 11:10 AM

redford

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From: Stephensville WI

I'd go back over all of those. Questionable parts can wear out within 1500 miles. 15,000 miles is well beyond "new". If they aren't bad that noise might be very expensive.

Feb 19, 2008 | 11:48 AM

Storm

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From: Neptune Beach, FL

How much drop is in your carrier bearing? Sounds like you have WAY too much drop..

Not enough drop = Low Speed vibration & noise
Too much drop = High Speed vibration & noise

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Feb 19, 2008 | 01:49 PM

Storm

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From: Neptune Beach, FL

Quote:

Originally Posted by knecoli22

It varies.. You just have to do it by trial and error.. I run 1-1/8" of drop for my 4.5" and I have no vibration or noise.. Buddy who has 5" lift runs 1-1/2" of drop.