# Thumping in rear center of my car

**URL:** <https://community.cartalk.com/t/thumping-in-rear-center-of-my-car/2667>\
**Category:** Maintenance/Repairs\
**Created:** [August 5, 2007, 6:42pm UTC](https://community.cartalk.com/t/thumping-in-rear-center-of-my-car/2667 "2007-08-05T18:42:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Al\_Maldonado](https://avatars.discourse-cdn.com/v4/letter/a/b9e5f3/32.png) [@Al\_Maldonado](https://community.cartalk.com/u/Al_Maldonado)\
**Post date:** [August 5, 2007, 6:42pm UTC](https://community.cartalk.com/t/thumping-in-rear-center-of-my-car/2667/1 "2007-08-05T18:42:20Z")

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I took my car (a '93 bmw 325i, 151K miles) to get serviced. I had all fluids changed, and when i drove out, there was a bit of a intermittent thumping sound in the rear center of my car. It doesn’t happen all the time and appears to happen only when I am in 1st gear, when I turn while in 1st gear, or while I am going backwards and turning in 1st gear.  
  
 Does anyone know why this might be happening and if it will be expensive?

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**Author:** ![Craig58](https://avatars.discourse-cdn.com/v4/letter/c/3da27b/32.png) [@Craig58](https://community.cartalk.com/u/Craig58)\
**Post date:** [August 5, 2007, 6:51pm UTC](https://community.cartalk.com/t/thumping-in-rear-center-of-my-car/2667/2 "2007-08-05T18:51:37Z")

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Did this start immediately after you had it serviced, if so I would take it back to them ASAP? Are you sure they refilled the differential fluid?

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [August 5, 2007, 6:52pm UTC](https://community.cartalk.com/t/thumping-in-rear-center-of-my-car/2667/3 "2007-08-05T18:52:53Z")

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Also, have then check the u-joints on the driveshaft. After 151K, they may be worn out.