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what causes rear end howling in my 66 mustang, 289- c4 it only does it at slow speeds????it has fluid
 

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Could be a couple of things:
1.excessive backlash and/or wear in the gears caused by 30+ years of service.
2.Worn or pitted carrier and/or pinon bearings (same cause as above)
3. Worn axle bearings.
I hope this helps you out. Scott

Every day is a holiday if you love your job.

Current projects: 65 Fastback, 68 Coupe Oval Track Racer, 64 Galaxie 500 XL, 54 F-100 Pickup
 

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Clicks could be dry suspension bushings or shock mounts too...

If the clicks are speed dependent and constant, could be loose lug nuts...

Wheel bearings going bad usually start with a quiet howl, which is speed-dependent and gets louder as the bearings wear out.

A loose u-joint can click as well at low speeds...

Wow, that narrows it down...*G*

Pat
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