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Old 03-22-2004, 16:38   #1 (permalink)
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9 inch vibe

Had my disc brake 9 inch diff rebuilt a little time ago. From day one, it has had a vibe above 80kph and increasingly gets worse as speed goes up. Tailshaft and unis are new and balanaced. Maybe bent axle????? any ideas or experiences. Cheers
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Old 03-22-2004, 18:24   #2 (permalink)
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Re: 9 inch vibe

I'll bet on a warped housing or bent caliper mounts.

I had a similar issues.... it was actually *both* of the above happening at once. Destroyed a new pair of rotors and pads and so far the new XF brake setup I decided on has set me back $1300.

Should be close to bullet proof when I get it back though!
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Old 03-23-2004, 02:38   #3 (permalink)
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Re: 9 inch vibe

I had a problem a few years ago with a 78 LTD. I went through everything ..I ended up finding the diff yoke was machined off centre.Must have been like that from new..
Your best check even though you have a new driveshaft is to check the tailshaft runout with a dial gauge..
A basic check if you dont have a dial gauge is to put the car up on stands under the diff housing.I also put some old tyres under the sill for added safety over just the stands..
Now start the car and put it in gear and let it idle over .Check the driveshaft is running true.
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Old 03-25-2004, 18:37   #4 (permalink)
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Re: 9 inch vibe

Thanx fellas. I'll have a look early next week. Hopefully it is something obvious.
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Old 04-01-2004, 22:24   #5 (permalink)
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Re: 9 inch vibe

Had a good look today and found there was 1/8th of an inch movement in the unis. Pulled out tail shaft and noticed the circlip that holds the unis in was not in properely. Took it back to hardie and spicer. They refitted circlip and rebalanced shaft. They told me the shaft had never been balanced properely to begin with. I reminded them that they did the original work on it only recently. There was no charge. Put back into car and all is good. No more annoying vibes. Yipee.
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