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Charger “metal torsion sound” very slow speed turns

Macdon221

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Best I can describe it...at very very slow speeds...like crawling in parking lot...when turning i am getting a metal torsion or rubbing sound. Brakes on or off. In gear has no bearing. When i straighten out it disappears after a few feet of straight ahead. This is the only time I hear it. A general look underneath reveals nothing. It sounds as it originating from the rear. It is very prominent.

Any ideas?
 
Jack up the center of the rear end and rotate each tire see if you hear crunching. It might be axle bearings. It may be the center section... To answer your question above changing the fluid will not help if you have damaged ring an pinion. When you do refill make sure to add friction modifier to the rearend lube.
 
Car on stands. Definite posi. 3.23 gears. Turned both tires. No scraping or crunching sounds. Each tire has about 3/4 inch play before drive shaft engages and starts to turn.
 
No “slop” in drive shaft u joints. Only bit of play in between the shaft and the tries inside the hub. Like I said bout 3/4 inch play
 
3/4" at the tire is not much. Put one on the ground and then see how hard you have to grunt to turn the other and also see if it makes noise doing this. After all, you did say during turning. It should be pretty hard to turn one wheel by hand with a good SureGrip.
 
Will do! Stand by!

Could loose spring u-bolts cause this?
Might could....but without hearing the noise in person, it's hard to diagnose it. One way to find out is to tighten them and then test it.
 
One tire on ground. Impossible to turn ture in either direction. Maybe 3/4-1inch play
 
Is the car in neutral? Sorry....
 
Yes. In neutral.

So...the ubolts were not that tight...re-torqued them...road test...not it.

But....i think it may be the brakes. Coast into a full left or right not in gear to a stop...put in drive and car will coast out no sound. Ease into tight turn, ease on brakes to stop...then ease off to start again...here comes the very prominent sound. From rear...like “metal on metal” slip/thug kind of sound. But...straight into a slow stop and start...nothing.

Stumped.
 
Is this something that just recently started doing?
 
I have had this car 4 months. But i dont think i was ever in a situation like a parking lot to notice.
 
Back on the Suregrip fluid change. I had a similar situation on a car a while back, also a car that I had owned for only a short time. I drained the rear end and refilled it (it was low anyway), but also made sure it had enough additive for the suregrip. Noise went away. If you only had the car for a short while, how do you know what is in the rear end and what additive, if any was put in. The additive makes an enormous difference on these.
 
Kowal..thanks for the information. My next step will be that. What fluid is the generally accepted fluid for the rear ends that everyone is using and what brand additive?
 
Before you dump the fluid, I would pull off both drums and check for a broken spring. If you have front drums you could check them also since sounds can travel. l I had that happen once and was the cause of a similar rubbing sound like you describe.
 
Any gear oil as you find at the parts store will do. But make sure you put this in to it as the additive. You can buy on Amazon as you see, but also direct from a Mopar dealer or places like Roseville Moparts (a dealer that is doing mail order). On the oil, I just checked my shelf, I used Napa one time, Valvoline the next...both 85W plus gear oil, Lucas is good. You can find on the web how much additive to put in, but I error on the side of if a little is good then more is better (its a small bottle, I pretty much use it all).

https://www.amazon.com/Genuine-Mopa...ocphy=9009968&hvtargid=pla-494944455795&psc=1
 
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Little confused as you say 'turning' at low speeds? Does this sound occur when stopped and turning the wheel? I'm having a little noise issue that's the latter I'm looking into. My next step is to take it to an alignment shop on the rack under full weight to watch the steering action from above. Only time I get the noise is when the car has been run a good distance so thinking heat expansion as a culprit since my car has headers and crammed in pretty tight. Mine sounds like a violin ahh about the best I can describe; no growling that's often akin to rear end issues.
 
So I changed the fluid and added the additive. No change.

What is the easiest way to rule out the rear brakes as being the culprit?
 
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