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Old 07-23-2019, 09:10 PM
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Driveshaft Starting to Fail?

I've got an MC 2.5" lift on and am thinking its pushing my stock driveshaft to it's limits.

Seems like there is a little play side to side when I twist and now I'm seeing some black grease building up on the u-joint. Is it on the way out or am I just being paranoid? I'm at 65k miles with maybe 500 miles since the lift.



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Old 07-23-2019, 09:25 PM   #2
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The play you mention when you twist, is it in the u-joints or in the differential? If in the u-joints, then they're done, yes.

Rotational play we're talking.

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Old 07-23-2019, 09:39 PM
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Most of the rotational play seems to be in the diff, maybe a half inch and then a clunk. Is the amount of visible grease normal with as many miles as I have?
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Old 07-24-2019, 12:53 AM   #4
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The small rotational play in the diff is the gear backlash, not an issue.
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Old 07-24-2019, 08:05 AM   #5
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Diff play is fine within reason, as shark mentioned. Clunk just residual of that.

Amount of grease, those with more experience than I can say. I have greasables and always have stains from the excess.
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Old 07-25-2019, 11:13 AM   #6
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You really can not Tell much with the back wheels on the ground . The u-joints may be dry ( no grease) or just worn out . Jack the back wheels up put the trans in neutral and you will see if it is the u-joints or something else . If it is the u-joint it is an easy fix and cheap .

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