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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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Old 12th March 2018, 05:59 PM
aussie 6.9 aussie 6.9 is offline
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Default 6.9 uni joint

The uni joint in the center of my 6.9 tail shaft needs replacing . What is the best way to do this job as it is supposed to be non replaceable. Help please!
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Old 12th March 2018, 07:04 PM
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Oversize Oversize is offline
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Default Re: 6.9 uni joint

There is no uni joint, it’s a bearing at the centre of a rubber mount. A common problem easily fixed but make sure you carefully mark the relationship bw the front and rear half’s (it’s a two piece tail shaft). Get it wrong & you’ll have to rebalance the whole assembly and risk having a vibration that won’t go away.
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Old 12th March 2018, 07:14 PM
Helmet Helmet is offline
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Default Re: 6.9 uni joint

Quote:
Originally Posted by Oversize View Post
There is no uni joint, itís a bearing at the centre of a rubber mount. A common problem easily fixed but make sure you carefully mark the relationship bw the front and rear halfís (itís a two piece tail shaft). Get it wrong & youíll have to rebalance the whole assembly and risk having a vibration that wonít go away.
There is a uni joint just behind the centre mount, itís part of the rear section tail shaft. Find a good tail shaft rebuilder and they can change it for you.
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Old 12th March 2018, 07:19 PM
aussie 6.9 aussie 6.9 is offline
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Default Re: 6.9 uni joint

My 6.9 has a flex dic at either end of the tail shaft, a center bearing mounted in a rubber housing and next to it where the shaft bends a uni joint which needs replacing. Regards Aussie6.9
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Old 12th March 2018, 07:29 PM
Helmet Helmet is offline
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Default Re: 6.9 uni joint

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Originally Posted by aussie 6.9 View Post
My 6.9 has a flex dic at either end of the tail shaft, a center bearing mounted in a rubber housing and next to it where the shaft bends a uni joint which needs replacing. Regards Aussie6.9
Yes , it can be replaced by a tail shaft rebuilder / balancer
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Old 12th March 2018, 07:34 PM
aussie 6.9 aussie 6.9 is offline
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Default Re: 6.9 uni joint

Thanks for the info. We have a good diff and driveline shop locally and will consult them.
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