Drivetrain Vibration Issue

G

ggradtech

Active Member

Jun 17, 2016

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Sep 25, 2016

#1

• Sep 25, 2016

• #1

While going down the highway at say 70-80mph, I get a vibration that happens when I hold the clutch in. Could the driveshaft be unbalanced? I've had other vibration issues related to the drums/rotors, but those are now fixed. Ialso get a very slight rythmic vibration while cruising. It is very slight, but with the clutch depressed the vibration is definately becomes more pronounced.

 

jrichker

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Dublin GA

Sep 25, 2016

#2

• Sep 25, 2016

• #2

Two simple things to check,.
1.) Transmission mount - oil soaked torn or loose bolt. Look that the crossmember rubber mounts as well.
2.) Dogbone vibration damper weight missing from the differential. it is one of the things that mistakenly gets removed in a futile effort to make the car lighter.

 

G

ggradtech

Active Member

Jun 17, 2016

179

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Sep 25, 2016

#3

• Sep 25, 2016

• #3

Thanks for the reply. Dogbone still attached and trans mount is perfect. No oil or play in bushings. Funny how while traveling at say 60 mph I get a vibration with clutch pressed in. Could the ds be out of balance? U-joint are good. I tried to rotate the ds 180° but it seems the same. It's an aluminum Ford Motorsports ds.

 

A5literMan

At least it is lumpy...

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Jul 30, 2011

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Illinois

Sep 26, 2016

#4

• Sep 26, 2016

• #4

I've seen the factory steel ds do that but not the FMS aluminum ones. Not to say it could be the ds. Has it ever been dropped/dented/drag raced? Could be tweaked? Do you hear any noise along with vibration? Could be trans related. Any leakage out of the rear of the trans?

 

G

ggradtech

Active Member

Jun 17, 2016

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Sep 26, 2016

#5

• Sep 26, 2016

• #5

As far as I know, it has never been dinged or damaged. No trains leaks of any kind. Trams shifts perfectly and it's very solid. Mounts look great too. Not really a sound as much as a sensation. Very slight rhythmic vibration while traveling on the highway. Then if the clutch is depressed, it seems less rhythmic and more constant, but only when the clutch is in.

 

a91what

SendMeUrDataLog

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Apr 6, 2011

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Hillsborough county

Sep 26, 2016

#6

• Sep 26, 2016

• #6

I would assume that the rear end may have slop in it. This would become much more noticeable with the drive train unloaded.

 

General karthief

wonder how much it would cost to ship you a pair

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Aug 25, 2016

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polk county florida

Sep 27, 2016

#7

• Sep 27, 2016

• #7

ggradtech said:

As far as I know, it has never been dinged or damaged. No trains leaks of any kind. Trams shifts perfectly and it's very solid. Mounts look great too. Not really a sound as much as a sensation. Very slight rhythmic vibration while traveling on the highway. Then if the clutch is depressed, it seems less rhythmic and more constant, but only when the clutch is in.

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I rarely reply to posts, many on here are more experienced than I and have helped me resolve issues just by looking here. If it were my problem first thing to is rebalance the rolling stock ( wheels and tires) if issue still present rebalance the drive shaft. That will eliminate the most likely causes

 

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