Rear end knocking

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Jan 16, 2011 | 11:59 PM

ZO6Bear

Thread Starter

Instructor

Joined: Jun 2009

Posts: 143

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From: Cali

Rear end knocking

I've got a knocking sound coming from my driverside wheel well. It happens when I start to accelerate or take my foot off the pedal. I can feel slack that I feel was not there before and the sound seems to coincide with said slack.

What could this be?

Jan 17, 2011 | 09:05 AM

ipuig

Drifting

Joined: Jan 2008

Posts: 1,722

Likes: 138

From: Florida

St. Jude Donor '09

Check the axle nut and verify that it is tight if you have not done so already. The torque specification is in the service manual.

Jan 17, 2011 | 10:38 AM

dgrant3830

Tech Contributor

Joined: Dec 2006

Posts: 10,962

Likes: 29

From: Van Buren Arkansas

Wounded Warrior Escort '11

Does the knock happen when you are driving down the road and if so, what gears?

Jan 17, 2011 | 12:05 PM

ZO6Bear

Thread Starter

Instructor

Joined: Jun 2009

Posts: 143

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From: Cali

It mainly happens while in the lower 4 gears, but I believe that's because its at lower speeds.

Jan 17, 2011 | 12:10 PM

dgrant3830

Tech Contributor

Joined: Dec 2006

Posts: 10,962

Likes: 29

From: Van Buren Arkansas

Wounded Warrior Escort '11

What I'm going to suggest may sound corny but I'm thinking old school diagnostics here. Try getting the rear wheels up off the ground and of course blocking the fronts from both sides or using jack stands. Get under there and try rocking each of the rear tires with the trans in neutral and see what you hear as a result. Try it again after putting the transmission in gear. Listen for the location of the knocking sound therefore identifying if its a CV joint on the half-shafts, differential, transmission or torque tube bushing.