bad grinding in corners

[jmitro]

99 base 2.5L, 5spd manual with 120k miles.

in tight corners with heavy throttle I hear a bad grinding noise from the rear end, like dragging steel pipe over a concrete floor. It does not happen with light throttle or in long sweepers.

I don't see anything obviously binding or grinding. All suspension pieces are brand new. I'm thinking the most likely culprit is a bad CV joint (boots are clean, no grease leaking) or maybe a bad wheel bearing (they don't seem loose when I rock the wheels with the suspension unloaded).

any other thoughts?

[maytag]

Wheel bearing would be my first inclination as well.

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[Gilles]

+ 1 on wheel bearing

Yes, with 120k miles it could well be a wheel bearing, better to replace both sides.

They are not too expensive (Pelican) and you will have a lot of fun replacing them..

[jmitro]

Lol thanks. I have all the tools including a 12 ton press. 😁

[The Radium King]

there is a test for wheel bearings. while you have the car on stands, also check your diff.

[jmitro]

How does one test wheel bearings? I thought it was to grab the wheel at 3 and 9 with tire off the ground and see if it feels loose

[t2-bxtrs]

When you have the Car on stands, a few simple wheel spins and you can listen and feel
for unusual grinding sound. Done this on a few occasions on my other cars. Hope this helps.

[The Radium King]

Originally Posted by jmitro

How does one test wheel bearings? I thought it was to grab the wheel at 3 and 9 with tire off the ground and see if it feels loose

ah - i re-read your initial post - you did test them and no movement. personally, i think that since the noise is proportional to the amount of power applied, that it happens in tight turns yet the the rear wheels don't turn, that you may have to look to your diff - you get the sound when one wheel is slipping perhaps.

[tommy583]

It could also be your center motor mount. Mine sounded similar only on hard throttle in tight corners. Have someone follow your car and see if the tail pipes move a lot when you get on the throttle hard. Or if the shifter moves a lot when you get on it.

[patssle]

My motor mount also sounded like grinding when turning. If it hasn't been replaced by 120k...I'd do that first.

[jmitro]

Definitely. I have a laundry list of repairs to make and motor/transmission mounts are on it. Hopefully the problem is not the diff.
Thanks all for the replies!

[jmitro]

thought I would update this thread with a note that replacing the motor/transmission mounts cured the grinding noise, so it was definitely not the differential

[Anker]

I have a grinding noise caused by bad transmission and motor mounts. Occurs when under heavy acceleration in first and second gear.

Have the parts, just need time to replace them.

[tommy583]

Originally Posted by jmitro

thought I would update this thread with a note that replacing the motor/transmission mounts cured the grinding noise, so it was definitely not the differential

Glad you got it sorted out