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FG Falcon driveline noise

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Hi all

 

first post,

 

Just bought a 08 FG falcon xr6t 6spd Manual

 

between 90-110+kmh/h there is a very noticeable vibration coming from the rear end of the car, the vibration doesn't matter if accelerating/decelerating or sitting at a stable speed.

 

  • I checked balance of wheels at tyre shop and even rotated wheels from back to front to eliminate the wheels being any part of the issue
  • Tailshaft and tailshaft centre bearing look completely new
  • Diff bushes are aftermarket polyurethane bushes and look fine (I wouldnt guess the extra firmness to be a contributing factor as I have had solid metal diff bushes in a previous car and made no vibrations what so ever.)
  • wheel bearings feel nice and tight and driveshafts feel good

 

The only thing I can think of is if a driveshaft has been bent or dinted ever so slightly or if the brand new tail shaft has not been balanced properly, is there anyone else who has had this problem and able to help?

 

Cheers

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The factory bush's are soft (rubbish) so they don't transfer noise from the diff (which is also rubbish). Take it to a gearbox place to check & expect to get a rebuild. You can put standard bush's in & change them regularly (or put FPV ones which are a bit harder). Either that or turn the radio up, remember they are a glorified taxi & while it will last don't expect it to be perfect. Like most things in life if you throw enough money at it you can 'fix' it

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So everyone who has nolathane diff bushes has a vibration from 90-110kmh?? Is this correct?

 

Just curious, my new looking tailshaft centre bearing is mounted by two bolts to the body of the car...but is gapped by what looks like 2 metal spacers (that the bolt goes through) on each side....I would have thought perhaps these would be rubber standard?? Just trying to work out if that part is normal or not normal 

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Anyone know ballpark figure for how much tailshaft balancing should cost? I live in a small city where we have one tailshaft place so im hoping not to get ripped off since they have the monopoly, cheers

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I have a manual and I do not have the said vibrations. Do keep in mind that I do have an upgraded drive shaft.

Aren't the tailshaft and driveshaft the same thing?

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tailshaft goes between the output of the gearbox and the diff.

driveshaft goes from the diff to the hubs/wheels :) There's two of them in our cars. :)

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Yea they have become interchangeable for a while now. Keith is technically correct though. However, is he legally correct? lol

 

correctdrive.jpg lol

Edited by adams355

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the "drive shafts" that Keith refers to, is what I have always called the axles. Even back in RSA we called it axles.

As long as well know what I am referring to, all is sweet.

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yep, realistically, any "driveshaft" is a shaft that provides driveline force. Any shaft that provides (or allows) the same direction of rotation directly to a wheel can be called an "axle", realistically.

 

The terms I used above are ones used in the service manual for these cars and ones people on this forum use, for the sake of clarity.

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I put stiff bushes in my car and it didn't cause any tailshaft vibration. 

 

I replaced my uni joint and it picked up some vibration. Hardy Spicer, the uni joint manufacturer, recommends getting the tailshaft balanced after install. 

 

On my car there are plastic things, presumably for balancing, attached to the tailshaft bolts at the diff. I dunno if they are on fg models but it could be something to consider. 

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Does anyone know if a f100 centre bearing works on our tailshafts? I’ve heard they can be used as it has the same bearing ID, you just need to modify the mounts. They look a lot stronger too  

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Hi all, update, I did not look hard enough (sorry), my rear left hand side nolathane diff bush has split. Reciepts say the upgraded diff bushes have travelled 50,000km. Hopefully another set will go that much again. Ill see if a forum sponser/seller sell new bushes

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Hi all, im replacing the old nolathane diff bushes today. I just noticed my falcon doesnt have one of those big black circle 'weight' looking things on the back of the large rear bush.....I noticed in a youtube video it says to keep it but mines missing. Is it critical I have one as I may need to get one from a wreckers if its needed, cheers

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