# grinding noise coming from under the car! What could it be? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [July 27, 2005, 9:29am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485 "2005-07-27T09:29:34Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![ziptied](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ziptied/32/5509_2.png) [@ziptied](https://forums.speedlife.net/u/ziptied)\ **Post date:** [July 27, 2005, 9:29am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/1 "2005-07-27T09:29:34Z")
Recently i’ve been hearing some grinding noise coming from under the car. I think the sounds coming from the driveshaft. You can only hear it at 900 rpm and sometimes while you’re driving aswell. Any help will be appreciated… :? ---
**Author:** ![Cal](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/cal/32/5505_2.png) [@Cal](https://forums.speedlife.net/u/Cal)\ **Post date:** [July 27, 2005, 4:38pm UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/2 "2005-07-27T16:38:17Z")
Is it coming from the front, middle, or rear of the car. ---
**Author:** ![Pavel](https://avatars.discourse-cdn.com/v4/letter/p/a4c791/32.png) [@Pavel](https://forums.speedlife.net/u/Pavel)\ **Post date:** [July 27, 2005, 5:07pm UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/3 "2005-07-27T17:07:44Z")
could it be rattling noises? the heatshield on your cat? ---
**Author:** ![DarkForceJackal](https://avatars.discourse-cdn.com/v4/letter/d/b38774/32.png) [@DarkForceJackal](https://forums.speedlife.net/u/DarkForceJackal)\ **Post date:** [July 27, 2005, 7:25pm UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/4 "2005-07-27T19:25:08Z")
Is the sound possibly coming from inside the transmission? Just something you’d want to rule out… Also, it is quite possible that part of your exhaust system is touching your frame somewhere. It vibrates against the body/frame at certain RPM’s and actually sounds like a grinding noise. Best of luck. ---
**Author:** ![ziptied](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ziptied/32/5509_2.png) [@ziptied](https://forums.speedlife.net/u/ziptied)\ **Post date:** [July 28, 2005, 8:39am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/5 "2005-07-28T08:39:59Z")
yeah i’m thinking it’s a rattle now because it happens the most when i’m not in gear…the sound comes right where me cats located, but it’s a little strange to me that it could happen so sudden… oneday my car is quite and the next the my car sounds like it’s going to far apart… btw…does the driveshaft spin if i’m not in gear? thanks for the help so far ---
**Author:** ![Theo23](https://avatars.discourse-cdn.com/v4/letter/t/43a26b/32.png) [@Theo23](https://forums.speedlife.net/u/Theo23)\ **Post date:** [July 28, 2005, 10:14am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/6 "2005-07-28T10:14:40Z")
> [@willX](#): > > btw…does the driveshaft spin if i’m not in gear? No, the drive shaft is directly connected to the rear wheels through the differential and axles. The clutch is what dissenguages the shaft (and tranny) from the engine. Theo ---
**Author:** ![SX1](https://avatars.discourse-cdn.com/v4/letter/s/a88e57/32.png) [@SX1](https://forums.speedlife.net/u/SX1)\ **Post date:** [July 29, 2005, 7:23am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/7 "2005-07-29T07:23:26Z")
> [@Theo23](#): > > [quote=willX]btw…does the driveshaft spin if i’m not in gear? No, the drive shaft is directly connected to the rear wheels through the differential and axles. The clutch is what dissenguages the shaft (and tranny) from the engine. Theo[/quote] The driveshaft will spin as long as you’re moving. It’s connected to the wheels. ---
**Author:** ![GT1](https://avatars.discourse-cdn.com/v4/letter/g/b5e925/32.png) [@GT1](https://forums.speedlife.net/u/GT1)\ **Post date:** [July 29, 2005, 8:46am UTC](https://forums.speedlife.net/t/grinding-noise-coming-from-under-the-car-what-could-it-be/87485/8 "2005-07-29T08:46:35Z")
i think what theo is trying to say is that the engine itself will not be spinning the driveshaft… rather the shaft will spin via the connection to the rear end. GT