# need help grinding noise and vibrarion in rear diff.

**URL:** <https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792>\
**Category:** Shift518 Automotive\
**Created:** [October 9, 2011, 9:44am UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792 "2011-10-09T09:44:04Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![82exp](https://avatars.discourse-cdn.com/v4/letter/8/edb3f5/32.png) [@82exp](https://forums.speedlife.net/u/82exp)\
**Post date:** [October 9, 2011, 9:44am UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792/1 "2011-10-09T09:44:04Z")

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Got a 1990 infiniti m30 and all the sudden there’s a grinding/humming in the rear diff as well as a bad vibration. Any ideas on whAt thios may be and how to fix it.

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**Author:** ![ReDevil](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/redevil/32/6385_2.png) [@ReDevil](https://forums.speedlife.net/u/ReDevil)\
**Post date:** [October 9, 2011, 10:07am UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792/2 "2011-10-09T10:07:19Z")

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I know nothing about the specific car, but has the diff oil ever been changed?

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**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\
**Post date:** [October 9, 2011, 10:29am UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792/3 "2011-10-09T10:29:56Z")

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Wheel bearing Prolly took a shit

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**Author:** ![82exp](https://avatars.discourse-cdn.com/v4/letter/8/edb3f5/32.png) [@82exp](https://forums.speedlife.net/u/82exp)\
**Post date:** [October 9, 2011, 2:45pm UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792/4 "2011-10-09T14:45:04Z")

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Found out it wasn’t the diff. It the u joint at the tranny. Anyone know where to get 1pc drive shafts

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**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\
**Post date:** [October 9, 2011, 3:33pm UTC](https://forums.speedlife.net/t/need-help-grinding-noise-and-vibrarion-in-rear-diff/260792/5 "2011-10-09T15:33:13Z")

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Anca,s can rebuild em I Belive