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Old 05-02-2008, 11:07 AM   #1 (permalink)
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Rear axle makes scraping noise when turning slow

Now that I've put some tailpipes on my Flowmaster 40 dumps, I notice that I can hear the 8.8 in my Fox making a slight scraping sound when I make a slow sharp turn at a stop light or into a parking lot. There is no clanging, chattering, or mechanical noise, just this scraping/rubbing noise along with the sensation of rotating friction. The 7.5 was replaced with an 8.8 by the previous owner and upgraded to 3.73 gears, but I don't know if the diff was also upgraded to something after market or not. On jack stands the axles turn freely and both wheels turn in the same direction. One way is to open up the rear end and inspect it, but, that withstanding, anyone wanna venture a guess as to what might be causing this friction noise that only happens during sharp slow speed turns?

Last edited by PaceFever79; 05-02-2008 at 01:56 PM.
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Old 05-02-2008, 04:30 PM   #2 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Is it only occuring when you turn the same direction(left or right side?), or does it do it whenever/wherever sharpish turns a being taken? Could be a bearing issue? Maybe a bearing in the differential? Could be a wheel bearing also....im thinking a bearing issue of somesort..

**EDIT**
Maybe is a tire flexxxing and rubbing on something? Any rubbing marks on the inner/outer sidewalls?
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Old 05-02-2008, 06:47 PM   #3 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Is it traction lok?? Or some other type of equal lok??

Might be just a normal noise. May need some additive.

You said when they were suspended in the air they both turned the same way. Doesn't sound like an open rear.

Don't think it is a wheel, axle bearing. They are turning all the time the car is rolling. Straight, left or right down the road.
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Old 05-02-2008, 07:52 PM   #4 (permalink)
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Re: Rear axle makes scraping noise when turning slow

I took it to a parking lot and just drove around in circles for a while to check it out more closely. Here is what I found. It makes the noise when turning either right or left. It begins making the noise almost as soon as the wheel is turned off center, in other words, as soon as the rear wheels are required to turn at different speeds. The sound is more of a scrubbing friction noise, rather than a scraping metal to metal noise. The noise is like you locked the parking brake 3/4 and then over powered it with throttle and started driving around. It's a friction noise, not a metal grinding noise. You said something about an additive, would that be something in addition to the gear oil for the traction lok? I looked all around the housing and the wheel bearings and there is nothing leaking. That doesn't mean it can't be low on oil, but it's not leaking anywhere at this time. Do you think it's just a noisy traction lok or should I pull the cover off for inspection? If so, what should I be looking for?

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Old 05-02-2008, 09:58 PM   #5 (permalink)
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Re: Rear axle makes scraping noise when turning slow

You need to add some friction modifier to your rear diff. The previous owner probably didn't do this. The sound you are hearing is clutch "chatter". There are several brands of friction modifier available such as equa-torque or you could use the genuine ford stuff.
Keep in mind, when you add this stuff it takes a while to "soak" into the clutches so give it awhile before you say I'm fulla crap.

More info here....

Differential Clutch Chatter
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Old 05-03-2008, 04:07 AM   #6 (permalink)
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Re: Rear axle makes scraping noise when turning slow

I use the Ford additive.

Put it in the rear. Then go drive it. Take it back to the parking lot you were at and do slow figure "8's". Go lock to lock on the steering wheel. Do maybe three or four should be enough. This will help get the additive in between the clutches to stop the chatter.
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Old 05-03-2008, 06:41 AM   #7 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Thanks guys,

I'm off to perform what I hope will be an ea$y fix
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Old 05-03-2008, 07:07 AM   #8 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Quote:
Originally Posted by Blulakr View Post
You need to add some friction modifier to your rear diff. The previous owner probably didn't do this. The sound you are hearing is clutch "chatter". There are several brands of friction modifier available such as equa-torque or you could use the genuine ford stuff.
Keep in mind, when you add this stuff it takes a while to "soak" into the clutches so give it awhile before you say I'm fulla crap.

More info here....

Differential Clutch Chatter
thanks

Last edited by PaceFever79; 05-03-2008 at 07:35 AM.
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Old 05-03-2008, 02:37 PM   #9 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Not wanting to hijack this thread but I've got the same problem with my rebuilt 8in, with trac lok, I've put oil with Additive in & I've done the figure 8 thing but it still is noisy on turning, (I've noticed it seems louder in reverse?) Is it ok to drive? I'm heading for the track on Monday, don't want to hurt it, what do you guys think?
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Old 05-03-2008, 04:43 PM   #10 (permalink)
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Re: Rear axle makes scraping noise when turning slow

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Originally Posted by dragracerdave View Post
Not wanting to hijack this thread but I've got the same problem with my rebuilt 8in, with trac lok, I've put oil with Additive in & I've done the figure 8 thing but it still is noisy on turning, (I've noticed it seems louder in reverse?) Is it ok to drive? I'm heading for the track on Monday, don't want to hurt it, what do you guys think?
I put some additive in mine today and took it out for a long cruise. By the time I got back the diff wasn't making the noise anymore.
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Old 05-03-2008, 05:52 PM   #11 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Quote:
Originally Posted by dragracerdave View Post
Not wanting to hijack this thread but I've got the same problem with my rebuilt 8in, with trac lok, I've put oil with Additive in & I've done the figure 8 thing but it still is noisy on turning, (I've noticed it seems louder in reverse?) Is it ok to drive? I'm heading for the track on Monday, don't want to hurt it, what do you guys think?
Just curious if you put oil with additive or oil plus additive? I think maybe the oil that claims to be for traction type diffs is not as good.
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Old 05-04-2008, 08:23 AM   #12 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Its Oil with Additive in it, Might try some additive as well, see if that helps,
Just wondered, Could the clutches be put in too tight? & will they wear out quickly?
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Old 05-04-2008, 02:36 PM   #13 (permalink)
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Re: Rear axle makes scraping noise when turning slow

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Originally Posted by dragracerdave View Post
Its Oil with Additive in it, Might try some additive as well, see if that helps,
Just wondered, Could the clutches be put in too tight? & will they wear out quickly?
I'd say, put in a tube of additive, then let's revisit the conversation.

It really worked wonders for my noisy differential.
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Old 05-18-2008, 11:06 AM   #14 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Well I finally tracked down some Redline friction modifier over here & put it in the axle, I've driven the car about 150miles since & its still making noises! not as bad & only after a few miles, don't know if another bottle might help?
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Old 02-04-2014, 02:17 AM   #15 (permalink)
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Re: Rear axle makes scraping noise when turning slow

Sounds like a steering ball joint is worn, or it could be a defective wheel bearing - if you jack the wheel up off the ground and put it on an axle stand, you can then shake the wheel with a hand top and bottom, and then side to side.
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